MtlX Surface Unlit VOP node

An unlit surface shader node.

On this page	Create emissive particles Particle network Emissive material Assign the material Parameters
Since	19.5

An unlit surface shader, constructed from emission and transmission values. It represents a surface that can emit and transmit light, but does not receive illumination from light sources or other surfaces.

Karma can render unlit surfaces so they don’t emit any light into the scene. Use a Render Geometry Settings node, to set Light Source Diffuse Scale and Light Source Specular Scale to 0.
This shader is useful for glowing/emissive particles.

Create emissive particles ¶

You can use this shader to emit light from particles, e.g. from a POP Network OBJ.

Note

The following guide only explains how to create emissive particles, not a complete scene setup with Camera LOP, Karma Render Settings LOP, etc.

On the stage level, press ⇥ Tab to open the Tab menu. From there, create SOP Create LOP.
Click the node’s name and rename it to particles.
Double-click the node to dive into it.
Inside the SOP Create LOP, add a particle source object. This can be any geometry, e.g. a Sphere SOP.
Add a downstream POP Network and connect its first input with the output of the sphere.
Double-click popnet to dive into it.

Particle network ¶

Inside the POP Network you can see a complete and fully working network. When you go to the Playbar and click to start the simulation, you will see that new particles are added, but they remain static. You need a force to move the particles.

Press ⇥ Tab again, and add a POP Force DOP.
Place the node between source_first_input and wire_pops_into_here to connect the force.
On the Noise tab, set Amplitude to 1.
Select source_first_input.
On the Birth tab, change Const. Birth Rate to 200 to decrease the number of particles.
Return to the stage level.

Emissive material ¶

The material lets you define emission strength and color.

Add a Material Library LOP and connect its input with the output of the particles SOP Create LOP.
Double-click the new node to dive into it. There, lay down an USD MaterialX Builder VOP. This node is basically a modified Sub Network VOP.
Dive into the mtlxmaterial node, create the MtlX Surface Unlit VOP node and connect its output with the input of surface_output.
Increase Emission to make the lights brighter, while Emission Color tints the particles.
Return to the stage level.

Assign the material ¶

You must assign the material to the particles through paths to see the lights.

Add an Assign Material LOP and connect its input with the output of materiallibrary1.
For Primitives, enter /particles. This is the path to the SOP Create LOP.
For Material Path, enter /materials/mtlxmaterial. This path points to the mtlxmaterial subnet inside the library.

You can see a graphic representation of the network’s hierarchy in the Scene Graph Tree pane. You can also drag elements from the Scene Graph Tree to the parameters of the Assign Material LOP.

Parameters ¶

Emission

Surface emission amount. Multiplier of the Emission Color.

Emission Color

Color emitted by the surface.

Transmission

Surface transmission amount. Multiplier of the Emission Color.

Transmission Color

Color transmitted through the surface.

Opacity

Surface presence, useful for cutting out shapes with images or other signals.

VOP nodes

Absolute

Computes the absolute value of the argument.
Add

Outputs the sum of its inputs.
Add Attribute

Adds a new attribute.
Add Constant

Adds the specified constant value to the incoming integer, float, vector or vector4 value.
Add Joint

Adds a KineFX joint to the geometry.
Add Point

Adds points to the geometry.
Add Point to Group

Adds the point specified to the group given.
Add Primitive

Adds primitives to the geometry.
Add Steer Force

Multiply steerforce by steerweight attributes and normalize results by total steerweight.
Add Vertex

Adds vertices to the geometry.
Add Wind Force

Layers a wind force onto a simulation.
Advect by Volumes

Advects a position by a set of volume primitives stored in a disk file.
Agent Clip Catalog

Returns all of the animation clips that have been loaded for an agent primitive.
Agent Clip Length

Returns the length (in seconds) of an agent’s animation clip.
Agent Clip Names

Returns an agent primitive’s current animation clips.
Agent Clip Sample

Samples an agent’s animation clip at a specific time.
Agent Clip Sample Rate

Returns the sample rate of an agent’s animation clip.
Agent Clip Times

Returns the current times for an agent primitive’s animation clips.
Agent Clip Weights

Returns the blend weights for an agent primitive’s animation clips.
Agent Convert Transforms

Converts transforms between local space and world space for an agent primitive.
Agent Layer Bindings

Returns the transform that each shape in an agent’s layer is bound to.
Agent Layer Name

Returns the names of the current layers or collision layers of an agent.
Agent Layer Shapes

Returns the names of the shapes referenced by an agent primitive’s layer.
Agent Layers

Returns all of the layers that have been loaded for an agent primitive.
Agent Rig Children

Returns the child transforms of a transform in an agent primitive’s rig.
Agent Rig Find

Finds the index of a transform in an agent primitive’s rig.
Agent Rig Parent

Returns the parent transform of a transform in an agent primitive’s rig.
Agent Transform Count

Returns the number of transforms in an agent primitive’s rig.
Agent Transform Names

Returns the name of each transform in an agent primitive’s rig.
Agent Transforms

Returns the current local or world space transforms of an agent primitive.
Align

Computes a matrix representing the rotation around the axes normal to two vectors by the angle which is between the two vectors.
Alpha Mix

Takes two values for alpha based on the surface orientation relative to the camera and blends between the two with a rolloff as the bias control, effectively removing the silhouettes of the geometry edges.
Ambient

Generates a color using ambient lighting model calculation.
And

Performs a logical and operation between its inputs and returns 1 or 0.
Anti-Aliased Flow Noise

Generates anti-aliased (fractional brownian motion) noise by using the derivative information of the incoming position to compute band-limited noise.
Anti-Aliased Noise

Generates anti-aliased noise by using the derivative information of the incoming position to compute band-limited noise.
Anti-Aliased Ramp Parameter
Append

Adds an item to an array or string.
Arctangent

Performs the atan2() function
Array Contains

Checks whether a value exists in an array.
Array Find Index

Finds the first location of an item in an array or string.
Array Find Indices

Finds all locations of an item in an array or string.
Array Length

Produces the length of an array.
Attenuated Falloff

Computes attenuated falloff.
Average

Outputs the average of its inputs.
Average Vector Component

Computes the average value of a vector argument.
BSDF Tint

Tints a BSDF with separate control over colorization and luminance.
Bake Exports

Export shading for use in bake image planes
Bias
Bind

Represents an attribute bound to VEX.
Bind Point Transform

Binds a KineFX point transform with a point index.
Blend Regions

Takes a float input as a bias to blend between three input regions.
Blend Transforms

Blends between two KineFX transformation matrices.
Block Begin

Marks the start of a code block.
Block Begin For

Marks the start of a for loop block.
Block Begin For-Each

Marks the start of a for-each loop block.
Block Begin If

Marks the start of an if code block.
Block End

Marks the end of a code block.
Block End Break-If

Marks the end of a code block.
Block End While

Marks the end of a while code block.
Bounding Box

Returns two vectors representing the minimum and maximum corners of the bounding box for the specified geometry.
Box Clip

Clips the line segment defined by p1 and p2 to the bounding box specified by the min and max corner points.
Boxes

Generates repeating filtered squares.
Bricker

Generates a brick pattern based on the parametric s and t coordinates.
Brushed Circles

Outputs an angle that gives the appearance of a circular brush pattern when used with anisotropy direction.
Brushed Metal Shader

A basic brushed metal shader.
Bump Noise

Displaces surfaces along their normal using anti-aliased noise, and returns the displaced surface position, normal, and displacement amount.
Bump To Normal Map

Compute a tangent-space normal map from a bump map
Burlap

Generates a burlap displacement pattern useful for simulating rough cloth or weave patterns.
Burlap Pattern

Returns float between 0 and 1 which defines a burlap pattern useful for simulating rough cloth or weave patterns.
COP Input

Returns a pixel value in one of the 4 input COPs connected to the VEX COP.
CVEX Shader Builder

A node that implements a CVEX shader using its children VOPs.
Car Paint Shader

Simulates car paint with embedded metallic flakes and a coat layer.
Cavities

Produces a surface displacement that simulates small surface damage using anti-aliased noise of various frequencies.
Ceiling

Returns the smallest integer greater than or equal to the argument.
Cellular Cracks

Generates a cellular crack displacement suitable for simulating skin, leather, dried earth, and all kinds of crusts.
Cellular Noise

Computes 2D, anti-aliased cellular noise suitable for shading.
Character to String

Converts an unicode codepoint to a UTF8 string.
Checkered

Returns number between 0 and 1 which defines a checkered pattern useful for visualizing parametric or texture coordinates.
Clamp

Clamps the input data between the minimum and maximum values.
Class Cast

Downcasts a generic (anonymous) co-shader object to a specific co-shader
Classic Shader

Flexible material including multiple reflection layers, subsurface scattering, refractions and displacement.
Classic Shader Core

A powerful, highly flexible, generic surface shader with displacement.
Cloud Noise

Generates 1D noise used for cloud noise generation.
Collect
Collide Geometry

Collides the specified joint with the target geometry.
Color Correction

Provides a means to change the hue, saturation, intensity, bias, gain and gamma of the input color.
Color Map

Looks up a single sample of RGB or RGBA color from a disk image.
Color Mix

Computes a blend (or a mix) of its two color inputs, and outputs the resulting color.
Color Transform
Combine Local Transform

Combines local and parent KineFX transforms with scale inheritance.
Compare

Compares two values and returns true or false.
Complement

Computes the complement of the argument by subtracting the argument from 1.
Composite
Compute Lighting

Computes lighting using Physically Based Rendering.
Compute Normal

This node gives finer control over handling of the normal attribute in VOPs.
Compute Tangents

Compute surface tangents in different ways.
Conductor Fresnel

Outputs a physically correct reflection factor for conductive materials.
Conserve Energy

Clamp the reflectivity of a bsdf to 1.
Constant

Outputs a constant value of any VEX data type.
Contour

Increases or decreases contrast for values at the bottom of the input range.
Copy

Takes a single input of any data type.
Cosine

Performs a cosine function.
Crackle

Returns float between 0 and 1 which defines a crackle pattern useful for simulating the fine grain texture in skin or on a much larger scale dried mudflats.
Create Point Group

Creates a new point group with the name specified.
Cross Product

Computes the cross product between two vectors, defined as the vector perpendicular to both input vectors.
Curl Noise

Creates divergence-free 3D noise using a curl function.
Curl Noise 2D

Creates divergence-free 2D noise using a curl function.
Curvature

Computes surface curvature.
Curve Solver

Positions and orients KineFX points from a curve and a list of segment lengths.
Decal

An OTL that performs composting of texture maps.
Degrees to Radians

Converts degrees to radians.
Delayed Load Procedural
Delayed Read Archive
Depth Map

Works on an image which was rendered as a z-depth image, returning the distance from the camera to the pixel (or plane) in question.
Determinant

Computes the determinant of a 4×4 or 3×3 matrix.
Dictionary Keys

Produces the keys of a dictionary.
Dictionary Length

Produces the length of a dictionary.
Direct Lighting

Internal VOP used to compute direct lighting.
Direction to Child

Computes the direction to a KineFX joint’s child.
Direction to Parent

Computes the direction to a KineFX joint’s parent
Dirt Mask

Masks crevices or exposed edges
Displace

Displaces surface position and modifies surface normals.
Displace Along Normal

Displaces the surface along the surface normal by a given amount.
Displacement Texture

Modifies normals and/or positions based on a texture map.
Distance

Returns the distance between two 3D or 4D points.
Distance Point to Line

Returns the closest distance between a point and a line segment defined by two end points.
Divide

Outputs the result of dividing each input value by the next.
Divide Constant

Divides the incoming integer, float, vector or vector4 value by the specified constant value.
Dot Product

Computes the dot product between two vectors.
Dual Rest

Outputs sanitized dual rest values based.
Dual Rest Solver

Sanitizes dual rest attribute data for easier use.
Edge Falloff

Creates a smooth roll-off of the input color from the center of the geometry to the edges, based on the surface normal.
Eggshell Pattern

Returns a new surface normal (N) which has a slight fine grained bump on it.
Eigenvalues
Ends With

Result 1 if the string ends with the specified string.
Environment Map

Sets the environment map (on an infinite sphere) and returns its color.
Euler to Quaternion

Builds a quaternion with the given euler rotation.
Exponential

Computes the exponential function of the argument.
Extract Local Transform

Computes a local transform for a KineFX point using its and its parent’s world transforms.
Extract Transform

Extracts the translation, rotation, scale or shear component of a 4×4 transform matrix.
Fake Caustics

Outputs and opacity value which can be used to approximate caustic lighting effects.
Fast Shadow

Sends a ray from the position P along the direction specified by the direction D.
Fibratus

Generates a 2D, fiber like cloud pattern.
Field Name

Provides a fallback value for a field/attribute if the field does not exist or the given field name is an empty string.
Field Parameter

Provides a fallback value for a field/attribute if the field does not exist or the given field name is an empty string.
Filament Sample
Filter Point Transforms

Find a point in an array and return the transforms in the corresponding arrays.
Filter Pulse Train

Filters the input.
Filter Shadow

Sends a ray from the position P along the direction specified by the direction D, a…
Filter Step

Computes the anti-aliased weight of the step function.
Filter Width

This function returns the square root of the area of a 3D input or the length of the derivative of a float input, such as s or t.
Find Attribute Value
Find Attribute Value Count
Find Attribute Value by Index
Find Point Transform

Find a point on a given geometry and return its transforms.
Fit Range

Takes the value in the source range and shifts it to the corresponding value in the destination range.
Fit Range (Unclamped)

Takes the value in the source range and shifts it to the corresponding value in the destination range.
Float to Integer

Converts a float value to an integer value.
Float to Matrix

Converts sixteen floating-point values to a 4×4 matrix value.
Float to Matrix2

Converts four floating-point values to a matrix2 value.
Float to Matrix3

Converts nine floating-point values to a matrix3 value.
Float to Vector

Converts three floating-point values to a vector value.
Float to Vector2

Converts two floating-point values to a vector2 value.
Float to Vector4

Converts four floating-point values to a vector4 value.
Floccus

Generates a 2D, locks of wool like cloud pattern.
Floor

Returns the largest integer less than or equal to the argument.
Flow Noise

Generates 1D and 3D Perlin Flow Noise from 3D and 4D data.
For Each Transform

Perform the same operation on an array of transforms.
Fraction

Computes the fractional component of the argument.
Fractus

Generates a 2D, ragged, broken up like cloud pattern.
Fresnel

Computes the Fresnel reflection/refraction contributions given a normalized incident ray, a normalized surface normal, and an index of refraction.
From NDC

Transforms a position from normal device coordinates to the coordinates in the appropriate space.
From NDC

Transforms a position from normal device coordinates to the coordinates in the appropriate space.
From Polar

Converts polar coordinates to cartesian coordinates.
Front Face

Returns the front facing normal of a surface, given a surface normal (N) and an incident ray (I).
Fur Guide Global Variables

Provides outputs representing commonly used input variables of fur guide shader network.
Fur Guide Output Variables and Parameters

Provides inputs representing the output variables of a fur guide shader network.
Fur Procedural

Creates a set of hair-like curves across a surface at render time.
Fur Skin Global Variables

Provides outputs representing commonly used input variables of fur skin shader network.
Fur Skin Output Variables and Parameters

Provides inputs representing the output variables of a fur skin shader network.
Furrows

Displaces the surface along the surface normal by an amount equal to the value of an anti-aliased cosine wave.
Fuzzy And

Performs a fuzzy and operation between its inputs and returns a value between 0 and 1.
Fuzzy Defuzz

Performs a defuzzify operation between its input fuzzy sets and returns a crisp value.
Fuzzy Inference

Performs a fuzzy inference operation over each input to determine the truth of the fuzzy set defined on this node.
Fuzzy Inference Mirror
Fuzzy Input

Performs a fuzzify operation that calculates a fuzzy value given a membership function and an input crisp value.
Fuzzy Not

This operator performs a fuzzy not operation on an integer or float value.
Fuzzy Obstacle Sense

Detects obstacles in an agent’s field of view.
Fuzzy Or

Performs a fuzzy or operation between its inputs and returns a value between 0 and 1.
Gain
Gather Loop

Sends rays into the scene and contains a subnetwork of VOPs to operate on the information gathered from the shaders of surfaces hit by the rays.
Gaussian Random

Generates a random number fitting a Gaussian distribution.
Gaussian Random UV

Generates a random number fitting a Gaussian distribution.
General Fresnel

Computes the Fresnel reflection/refraction contributions and vectors for objects with or without depth.
Generic Shader

Represents a shader.
Geometry VOP Global Parameters

Provides outputs that represent all the global variables for the Attribute VOP network types.
Geometry VOP Output Variables

Simple output variable for Geometry VOP Networks.
Get Attribute
Get BSDF Albedo

Compute the reflectivity of a bsdf.
Get Blur P
Get CHOP Attribute

Returns a CHOP attribute value in one of the 4 input CHOPs connected to the Channel VOP.
Get Channel Transform

Returns a transform value built from 9 channels from one of the 4 input CHOPs connected to the Channel VOP.
Get Channel Value

Returns a sample value in one of the 4 input CHOPs connected to the Channel VOP.
Get Channel Value by Name

Returns a sample value in one of the 4 input CHOPs connected to the Channel VOP.
Get Descendant Transforms

Traverse the hierarchy from a given point and return their transforms.
Get Dictionary Element

Gets a specified value from dictionary.
Get Element

Gets a specified element from array.
Get FBIK Attributes

Retrieve configuration values for the Physical Full-Body IK solver from point attributes.
Get Full Body COM

Return the computed center-of-mass for the given KineFX geometry.
Get Joint Chain Axes

Computes a set of orthogonal axes centered at a KineFX joint.
Get Layer Export

Obtains a value of the export variable added to the Shader Layer struct.
Get Matrix Component

Extracts a 4×4 matrix component.
Get Matrix2 Component

Extracts a 2×2 matrix3 component.
Get Matrix3 Component

Extracts a 3×3 matrix3 component.
Get Object Transform

Gets the transform matrix of a named object in camera (current) space.
Get PTexture ID
Get Parent

Finds the parent of a joint within a KineFX skeleton.
Get Parent Transform

Gets the transformation of a joint’s parent within a KineFX skeleton.
Get Point Transform

Returns a point transform for a given point index.
Get Point Transforms

Returns arrays of point transforms given an array of point IDs.
Get Primitive ID
Get Vector Component

Extracts a vector component.
Get Vector2 Component

Extracts a vector2 component.
Get Vector4 Component

Extracts a vector4 component.
Get a CHOP Channel Value

Evaluates a CHOP channel and return its value.
Get a Channel or Parameter Value

Evaluates a channel (or parameter) and return its value.
Get an Object Transform

Evaluates an OBJ node’s transform
Gingham Checks

Generates anti-aliased gingham checks similar to a tablecloth pattern.
Global Variables

Provides outputs that represent all the global variables for the current VOP network type.
Gradient 3D

Returns the gradient of a single channel 3D texture image at a specified position within that image.
HSV to RGB

Converts HSV color space to RGB color space.
Hair Normal

Generates a normal vector which always faces the camera, parallel to the incidence vector.
Hair Shader

A powerful, highly flexible, general model for hair/fur shading.
Has Input

Returns 1 if the specified input (0-3) is connected.
Has Key

Returns if a dictionary has a key.
High-Low Noise

Computes a mix of high and low frequency, anti-aliased noise with a wide range of applications.
Houdini Engine Procedural: Curve Generate

Cooks a SOP asset for each point in the source geometry and instances the generated curves onto the point.
Houdini Engine Procedural: Point Generate

Cooks a SOP asset for each point in the source geometry and instances the generated points onto the point.
Hue Shift

Uses the shift value to move the hue of the input color along the color wheel by the amount influenced by the amplitude.
IK Solver

Positions and orients points from a root position, end effector position target, and twist position using KineFX Inverse Kinematics.
If Connected

Passes through the value of the first input if the first input is ultimately connected.
Illuminance Loop

Only available in Surface VOP networks.
Image 3D Iso-Texture Procedural

This procedural will generate an iso-surface from a 3D texture image (.i3d file).
Image 3D Volume Procedural

This procedural will generate a volume from a 3D texture image (.i3d file).
Import Attribute

Imports attribute data from the OP connected to the given input.
Import Detail Attribute
Import Displacement Variable

Imports the value of the specified variable from a displacement shader and stores it in var.
Import Light Variable

Imports the value of the specified variable from a light shader and stores it in var.
Import Point Attribute
Import Primitive Attribute
Import Properties from OpenColorIO

Imports a color space property from Open Color IO.
Import Ray Variable

Imports the value of the specified variable sent from a trace() function and stores it in var.
Import Surface Variable

Imports the value of the specified variable from a surface shader and stores it in var.
Import Vertex Attribute
Importance Remap
In Group

Returns 1 if the point or primitive is in the group specified by the string.
Indirect Lighting

Internal VOP used to compute indirect lighting.
Inline Code

Write VEX code that is put directly into your shader or operator definition.
Insert

Inserts an item, array, or string into an array or string.
Instance with Hscript Procedural

Runs hscript for each point in the source geometry and instances the generated geometry to the point.
Integer to Float

Converts an integer value to a float value.
Integer to Vector
Intersect

Computes the intersection of a ray with geometry.
Intersect All

Computes all the intersections of a ray with geometry.
Invert

If given a 3×3 or 4×4 matrix, this operator computes its inverse (or just returns the input matrix if it detects singularity).
Irradiance

Computes the irradiance (the global illumination) at the point P with the normal N.
Is Alphabetic

Result 1 if all the characters in the string are alphabetic.
Is Connected

Outputs 1 if the input is ultimately connected, otherwise it outputs 0.
Is Digit

Result 1 if all the characters in the string are numeric.
Is Finite

Returns 1 if the number is a normal number, ie, not infinite or NAN.
Is Fog Ray

Returns 1 if the shader is being evaluated from within a fog shader.
Is Front Face

Returns true if the normal of the surface is forward facing, and false if it isn’t.
Is NAN

Returns 1 if the number is not a number.
Is Shadow Ray

Returns 1 if the shader is being evaluated for shadow rays.
Jittered Hair Normal
Join Strings

Concatenate all the strings of an array inserting a common spacer.
Joint Angle

Gets the angle at the given joint in a KineFX skeleton.
Karma AOV 2.0

Creates a shading signal for output to an AOV, as well as the render vars.
Karma Camera Falloff

Generate a smooth roll-off between surface normal and the camera ray.
Karma Fur

A physically-based hair and fur material with medulla support
Karma Hair

A physically-based hair and fur material.
Karma Hexagonal Tiling Texture

Seamless texturing and normal mapping without visible repetitions based on provided UV coordinates.
Karma Hexagonal Tiling Triplanar

Seamless texturing and normal mapping without visible repetitions involving triplanar projections and based on P.
Karma Light Filter Attenuation

Karma Light Filter that controls how the light intensity/color changes over distance.
Karma Light Filter Barndoor

Karma Light Filter that adds barndoors to a cone light.
Karma Light Filter Gel

Karma Light Filter that adjusts the color, intensity, or diffuse/specular of a light source.
Karma Light Filter Gobo

Karma Light Filter that projects the light source through a texture.
Karma Light Projection

You can use this utility node in a light filter network to get the UV coordinates of the current ray in the light’s projection space.
Karma Material Properties

Apply Karma geometry properties via shaders.
Karma OCIO Color Transform

Transforms color spaces using Open Color IO.
Karma Physical Lens

A pre-made lens shader implementation with controls for most common lens shader effects, such as bokeh, chromatic aberrations, and tilt/shift.
Karma Physical Lens Core

The stripped down version of the physical lens.
Karma Point Cloud Read

This node opens a point cloud file and searches for points around a source position then returns a value of geometry attribute imported from pointcloud
Karma Pyro Fire Color

Creates a color value used to control the emission component of volume shading used for fire.
Karma Pyro Fire Emission

Creates emission to control the emission component of volume shading used for fire.
Karma Pyro Scatter Color

Creates a color value used to control the emission component of volume shading used for explosions.
Karma Pyro Scatter Emission

Creates emission to control the emission component of volume shading used for explosions.
Karma Pyro Shader

Flexible, production-quality smoke, cloud, fire, and explosion shader.
Karma Pyro Smoke Color

Creates a color value used to control the scattering and absorption component of volume shading.
Karma Pyro Volume Mask

Creates a volume mask used for volume shading.
Karma Ramp Constant

Look up the color/float at a certain index in a ramp.
Karma Ray Hit Level Falloff

Attenuate values based on bounces.
Karma Ray Import

Imports the value of the specified variable from Karma.
Karma Room Lens

Generates an interior room map
Karma Room Map

Creates a parallax projection of a room interior onto a flat plane
Karma UV Lens

This is the Karma UV rendering lens shader.
Karma Volume

Karma XPU compatible node for building MaterialX volume shader
Karma Voronoi Noise 2D

Generates Voronoi noise
Karma Voronoi Noise 3D

Generates Voronoi noise
Lambert

Generates a color using the Lambert diffuse lighting model calculation.
Layer Composite

Combines two layers using standard compositing operations.
Layer Mix

Outputs a mix of the two input layers, blended using the alpha value.
Layer Pack

Creates a Layer from individual shading components.
Layer Unpack

Unpacks the individual shading components from a layer.
Length

Computes the length of an array
Length

Computes the length of a 3D or 4D vector.
Lens Bokeh

A VOP that can generate different kinds of bokeh.
Lens Chromatic Aberration

A VOP that can generates the tint and index of refraction for chromatic aberration effects.
Lens Coordinates

A VOP that creates the jittered coordinates for Karma lens shaders.
Lens Distort

A VOP that generates the offsets required to distort a Karma lens shader.
Lens OpenCV Distort

A VOP that generates the NDC coordinates with the OpenCV lens distortion model applied on a Karma lens shader.
Lens Parameters

A VOP that generates the Karma lens shader inputs.
Lens Rolling Shutter

A VOP that generates a time offset to simulate rolling shutter in digital lenses.
Lens Shutter Curve

A VOP that manipulates the time distribution of lens shutters.
Lighting Model

Performs a lighting model calculation to generate a color.
Limits

Selectively clamps values to a minimum and/or maximum value.
Logarithm

Computes the natural logarithm function of the argument.
Look At

Computes a 3×3 rotation matrix to orient the z-axis along the vector (to - from) under the transformation.
Look At Constraint

Applies a KineFX Look At constraint to a transform.
Luminance

Computes the luminance of the RGB color specified by the input parameter.
Make Instance Transform

Builds a general 4×4 transform matrix derived from the standard copy/instance attributes
Make Space Transform

Returns the transformation matrix to transform from a transform space such as an object’s transform space to another space, such as world space.
Make Transform

Builds a general 4×4 transform matrix.
Mandelbrot Set

Generates a Mandelbrot pattern.
Map Point

Creates a dictionary that maps one KineFX point to another.
MatCap Shader

A Material Capture shader.
Material shader builder

A higher-level shader that can contain one or more sub-shaders, such as surface shaders, displacement shaders, and rendering properties.
Matrix to Float

Unpacks a 4×4 matrix into its sixteen components.
Matrix to Vector4

Unpacks a 4×4 matrix into its rows.
Matrix2 to Float

Unpacks a 2×2 matrix2 into its four components.
Matrix2 to Matrix3

Converts a 2×2 matrix to a 3×3 matrix.
Matrix2 to Matrix4

Converts a 2×2 matrix to a 4×4 matrix.
Matrix2 to Vector2

Unpacks a 2×2 matrix into its rows.
Matrix3 to Float

Unpacks a 3×3 matrix3 into its nine components.
Matrix3 to Matrix2

Converts a 3×3 matrix to a 2×2 matrix.
Matrix3 to Matrix4
Matrix3 to Quaternion

Converts a matrix3, representing a rotation, to a quaternion representing the same rotation.
Matrix3 to Vector

Unpacks a 3×3 matrix into its rows.
Matrix4 to Matrix2

Converts a 4×4 matrix to a 2×2 matrix.
Matrix4 to Matrix3
Matte

Implements a matte shader that occludes geometry behind the surface being rendered.
Max Vector Component

Computes the maximum value of a vector argument.
Maximum

Outputs the maximum value from its inputs.
Meta-Loop Import

Takes a handle generated by the Meta-Loop Start operator and will import attributes…
Meta-Loop Next

Takes a handle generated by the Meta-Loop Start operator and will iterate to the …
Meta-Loop Start

Opens a geometry file and initializes the handle to iterate through all metaballs at the position specified.
Metaball Attribute

Returns the value of the given point attribute at the specified position in the metaball field.
Metaball Density

Returns the density of the metaball field at the specified position.
Metaball Space

Transforms the specified position into the local space of the metaball.
Metaball Weight

Returns the metaweight of the geometry at a given position.
Metadata

Returns true if the specified metadata exists.
Metadata

Returns metadata from one of the 4 input COPs connected to the VEX COP.
Method

Represents a method inside a class-based shader.
Method Call

Invokes a given method on a given struct or co-shader object.
Method Input

Represents a method argument list inside a class-based shader.
Method Subnet

Represents a method inside a class-based shader.
Min Vector Component

Computes the minimum value of a vector argument.
Minimum

Outputs the minimum value from its inputs.
Minimum Position

Given a position in world space, returns the position of the closest point on a given geometry.
Mix

Computes a blend (or a mix) of its input values using linear interpolation.
Modulo

Computes the modulo of two values.
MtlX Absorption Vdf

Constructs a VDF for pure light absorption.
MtlX Absval
MtlX Acescg To Lin Rec709

A new MaterialX Node
MtlX Acos
MtlX Add
MtlX Adobergb To Lin Rec709

A new MaterialX Node
MtlX Ambientocclusion
MtlX Anisotropic Vdf

Constructs a VDF scattering light for a participating medium.
MtlX Arrayappend
MtlX Artistic Ior
MtlX Asin
MtlX Atan2
MtlX Bias
MtlX Bitangent
MtlX Blackbody

Returns the radiant emittance of a blackbody radiator with the given temperature.
MtlX Blur
MtlX Bump
MtlX Burley Diffuse Bsdf

A BSDF node for Burley diffuse reflections.
MtlX Burn
MtlX Ceil
MtlX Cellnoise2D

2D cellular noise
MtlX Cellnoise3D
MtlX Checkers 2D

Checkerboard pattern.
MtlX Circle

A circle shape.
MtlX Circles 2D

Pattern of circles or rings.
MtlX Clamp
MtlX Cloverleaf

A cloverleaf shape.
MtlX Color Correct
MtlX Color Cubic Ramp
MtlX Color Ramp
MtlX Combine2
MtlX Combine3
MtlX Combine4
MtlX Conductor Bsdf

A reflection BSDF node based on a microfacet model and a Fresnel curve for conductors/metals.
MtlX Conical Edf
MtlX Constant
MtlX Contrast

Increase or decrease contrast of incoming float/color values using a linear slope multiplier.
MtlX Convert
MtlX Cos
MtlX Create Matrix
MtlX Create Matrix (3×3)
MtlX Crosshatch

A cross-hatch pattern.
MtlX Crossproduct
MtlX Curveadjust
MtlX Determinant
MtlX Dielectric Bsdf

A reflection/transmission BSDF node based on a microfacet model and a Fresnel curve for dielectrics.
MtlX Difference
MtlX Directional Light
MtlX Disjointover
MtlX Disney BSDF 2012
MtlX Disney BSDF 2015
MtlX Displacement

A constructor node for the displacement shader.
MtlX Distance

Measure distance between two points.
MtlX Divide
MtlX Dodge
MtlX Dot
MtlX Dotproduct
MtlX Exp
MtlX Extract
MtlX Facing Ratio

Generate a smooth roll-off between two vectors.
MtlX Facing Ratio
MtlX Float Cubic Ramp
MtlX Float Ramp
MtlX Floor
MtlX Fractal3D

Zero-centered 3D Fractal noise.
MtlX Frame
MtlX G18 Rec709 To Lin Rec709

A new MaterialX Node
MtlX G22 Ap1 To Lin Rec709

A new MaterialX Node
MtlX G22 Rec709 To Lin Rec709

A new MaterialX Node
MtlX Gain
MtlX Generalized Schlick Bsdf

A reflection/transmission BSDF node based on a microfacet model and a generalized Schlick Fresnel curve.
MtlX Generalized Schlick Edf

A fresnel EDF.
MtlX Geometry Color
MtlX Geometry Property Value
MtlX Glossiness Anisotropy
MtlX Gltf Colorimage

A new MaterialX Node
MtlX Gltf Image

A new MaterialX Node
MtlX Gltf Iridescence Thickness

A new MaterialX Node
MtlX Gltf Normalmap

A new MaterialX Node
MtlX Gooch Shade
MtlX Grid

A grid pattern.
MtlX HSV to RGB
MtlX Hcatmullrom
MtlX Heighttonormal
MtlX Hexagon

A hexagon shape.
MtlX Hinvlinear
MtlX Hsvadjust

Adjust the hue, saturation and value of a color.
MtlX Huniformcubic
MtlX Huniformramp
MtlX If Equal
MtlX If Greater
MtlX If Greater or Equal
MtlX Image

Samples data from a single image, or from a layer within a multi-layer image.
MtlX In
MtlX Inside
MtlX Invert
MtlX Invertmatrix
MtlX Layer
MtlX Light
MtlX Lin Adobergb To Lin Rec709

A new MaterialX Node
MtlX Lin Displayp3 To Lin Rec709

A new MaterialX Node
MtlX Line

A line shape.
MtlX Ln
MtlX Luminance

Output a grayscale luminance of a color.
MtlX Magnitude
MtlX Mask
MtlX Matte
MtlX Max
MtlX Measured Edf

Constructs an EDF emitting light according to a measured IES light profile.
MtlX Min
MtlX Minus
MtlX Mix
MtlX Modulo
MtlX Multiply
MtlX Noise2D
MtlX Noise3D

3D Perlin noise.
MtlX Normal
MtlX Normalize
MtlX Normalmap
MtlX Oren Nayar Diffuse Bsdf

A BSDF node for diffuse reflections.
MtlX Out
MtlX Outside
MtlX Over
MtlX Overlay
MtlX PBR Texture Set

Texture sets for MtlX Standard Surface.
MtlX Place2D

Transform incoming UV texture coordinates for 2D texture placement.
MtlX Plus
MtlX Point Light
MtlX Position
MtlX Power
MtlX Premult
MtlX RGB to HSV
MtlX Ramp4
MtlX Ramplr
MtlX Ramptb
MtlX Random Color

Random RGB color pattern.
MtlX Random Float

Random float pattern.
MtlX Range
MtlX Rec709 Display To Lin Rec709

A new MaterialX Node
MtlX Reflect
MtlX Refract
MtlX Remap
MtlX Rotate2D

Rotate a vector2 value about the origin in 2D.
MtlX Rotate3D
MtlX Roughness Anisotropy
MtlX Roughness Dual
MtlX Round
MtlX Safe Power
MtlX Saturate

Adjust the saturation of a color.
MtlX Screen
MtlX Separate Color 3
MtlX Separate Color 4
MtlX Separate Vector 3
MtlX Separate Vector 4
MtlX Separate2
MtlX Sheen Bsdf

A microfacet BSDF for the back-scattering properties of cloth-like materials.
MtlX Sign
MtlX Sin
MtlX Smoothstep
MtlX Splitlr
MtlX Splittb
MtlX Spot Light
MtlX Sqrt
MtlX Srgb Displayp3 To Lin Rec709

A new MaterialX Node
MtlX Srgb Texture To Lin Rec709

A new MaterialX Node
MtlX Standard Surface

A physically-based shader.
MtlX Standard Surface To Gltf Pbr

A new MaterialX Node
MtlX Standard Surface to USD Preview Surface

Translation shader from Standard Surface to USD Preview Surface.
MtlX Subsurface BSDF

A BSDF for true subsurface scattering.
MtlX Subtract
MtlX Surface
MtlX Surface Material

Constructs a surface shader describing light scattering and emission for closed 'thick' objects.
MtlX Surface Unlit

An unlit surface shader node.
MtlX Switch
MtlX Swizzle
MtlX Tan
MtlX Tangent
MtlX Texcoord
MtlX Thin Film Bsdf

Adds an iridescent thin film layer over a microfacet base BSDF.
MtlX Thin Surface

A constructor node for two-sided objects.
MtlX Tiled Circles

A tiled-circle pattern.
MtlX Tiled Cloverleafs

A tiled-cloverleaf pattern.
MtlX Tiled Hexagons

A tiled-hexagon pattern.
MtlX Tiled Image

Samples data from a single image, with provisions for tiling and offsetting the image across uv space.
MtlX Time
MtlX Transformmatrix
MtlX Transformnormal
MtlX Transformpoint
MtlX Transformvector
MtlX Translucent Bsdf

A BSDF node for pure diffuse transmission.
MtlX Transpose
MtlX Triangle Wave

A triangle-wave pattern.
MtlX Triplanar Projection
MtlX UDIM Offset

Manually set UDIM texture coordinates.
MtlX UDIM Patch

Extract the UDIM patch from texture coordinates.
MtlX USD Preview Surface

MaterialX flavor of USD Preview Surface shader
MtlX USD Primvar Reader

MaterialX flavor of USD Primvar Reader
MtlX USD Transform 2D

MaterialX flavor of USD Transform 2D shader
MtlX USD UV Texture

MaterialX flavor of USD UV Texture shader
MtlX USD UV Texture

MaterialX flavor of USD UV Texture 2.3 shader
MtlX Unified Noise 2D
MtlX Unified Noise 3D
MtlX Uniform Edf

An EDF node for uniform emission.
MtlX Unpremult
MtlX View Direction
MtlX Volume

A constructor node for the volume shader type.
MtlX Volume Material

A volume material.
MtlX Worleynoise2D
MtlX Worleynoise3D
MtlX glTF Pbr

A PBR shader from glTF-2.0.
MtlX gltf image (vector)

A new MaterialX Node
Mtlx Complement

Returns complementary float value.
Mtlx Complement Color

Returns complementary RGB color
Multiply

Outputs the product of its inputs.
Multiply Add Constant

Will take the input value, add the pre-add amount, multiply by the constant multiplier, then add the post-add amount.
Multiply Constant

Multiplies the incoming value by a constant.
Near Point

Finds closest point in a given geometry file.
Negate

Negates the incoming integer, float, vector or vector4 value.
Neighbor Count File

Count the number of connected points from a given point in a given geometry file (or op:path)
Neighbor File

Finds the nth neighbouring point for a given point in a given geometry file.
Neighbors

Retrieves an array of indices to the points connected to the given point.
Non-Deterministic Random

A non-deterministic random number generator.
Normal Clamp

Clamp shading normals to prevent bad reflection directions
Normal Falloff

Generates a falloff value based on the relationship between the normal and incident vectors.
Normalize

Normalizes a vector.
Not

This operator performs a logical not operation on an integer value, returning 1 if the input is zero, and 0 if the input is non-zero.
Null

Passes the inputs to the output with an optional name change.
OCIO Color Transform

Transforms color spaces using OpenColorIO.
OCIO Color Transform View

Transforms color spaces into a View using OpenColorIO.
OSL Bias
OSL Calculate Normal
OSL Dx/Dy/Dz
OSL Environment Map
OSL Gain
OSL Generic Shader Builder

Implements an OSL shader.
OSL Logarithm
OSL Step
OSL Texture Map
OSL Transform
OSL Transform Color
Occlusion

Computes ambient occlusion at the point P with the normal N.
Ocean Sample Layers

Sample ocean values from layered ocean spectra at the specified position and time.
Offset Transform

Offsets a KineFX transformation matrix by the given transform.
OpenSubdiv Face Count

Returns the number of coarse faces in the subdivision hull
OpenSubdiv First Patch

Returns the patch of the first patch for a given face in the subdivision hull.
OpenSubdiv Limit Surface

Evaluates a point attribute on the limit of a subdivision surface.
OpenSubdiv Lookup Face

Outputs the Houdini face and UV coordinates corresponding to the given coordinates on an OSD patch.
OpenSubdiv Lookup Patch

Outputs the OSD patch and UV coordinates corresponding to the given coordinates on a Houdini polygon face.
OpenSubdiv Patch Count

Returns the number of patches in the subdivision hull
Or

This operator performs a logical or operation between its inputs and returns 1 or 0 .
Oren-Nayar

Generates a color using the Oren-Nayar diffuse lighting model calculation.
Orient

Reorients a vector representing a direction by multiplying it by a 4×4 transform matrix.
Oscillations

Returns an anti-aliased cosine or sine wave.
Outer Product

Computes the outer product of a pair of vectors.
Output Variables and Parameters

Provides inputs representing the writable output variables of the shader network.
PBR Emission

Makes a shaded surface emissive.
PBR Hair Primary Reflection

Produce a hair BSDF.
PBR Hair Secondary Reflection

Produce a hair BSDF.
PBR Hair Transmission

Produce a hair BSDF.
PBR Lighting

Evaluate Lighting Using PBR.
PBR Metallic Reflection

Computes metallic reflections.
PBR Non-Metallic

Computes reflections and refractions for dielectric (non-metallic) materials.
PBR SSS

Creates an approximate SSS BSDF.
PBR Single Scatter

Creates a Single Subsurface Scatter BSDF.
PBR Volume Phase Function
Parameter

Represents a user-controllable parameter.
Parent Blend

Blends between KineFX transforms with an offset computed from the given bind transforms.
Parent Constraint

Constrains a KineFX point’s parent to a new world transform.
Periodic Noise

Generates 1D and 3D Perlin noise from 1D, 3D and 4D data.
Periodic Worley Noise

Computes 1D, 3D, and 4D tileable Worley noise, which is synonymous with cell noise.
Photon Output Variables

Performs photon russian roulette.
Physical SSS

Outputs surface color based on a physically-based subsurface scattering model. This node an do physically correct single scattering and/or multiple scattering.
Physically Based Diffuse

Produce a normalized diffuse bsdf.
Pixel Area

Returns the area of the current pixel after being transformed to the new UV coordinate uvpos.
Pixel Derivative

Returns U and V derivatives of the current pixel.
Plane Clip

Clips the line segment defined by p1 and p2 against the 3D plane defined by the following equation: plane.
Plane Count

Returns the number of planes in the input.
Plane Exists

Returns the name of the plane with the index plane_index in input input_index.
Plane Index

Returns the index of the plane with the name plane_index in input input_index.
Plane Name

Returns the name of the plane with the index plane_index in input input_index.
Plane Size

Returns the number of components in the plane with the index plane_index in input input_index.
Point Bounding Box

Returns two vectors representing the minimum and maximum corners of the bounding box for the specified geometry.
Point Cloud Close

This node closes a point cloud handle opened by pcopen.
Point Cloud Export

This node exports point data while inside a pcunshaded loop.
Point Cloud Farthest

This node finds the farthest query point produced by pcopen.
Point Cloud Filter

This node filters the points queried by pcopen.
Point Cloud Find

Returns a list of closest points from a file
Point Cloud Find Radius

Returns a list of closest points from a file taking into account their radii.
Point Cloud Import

This node imports point data while inside a pciterate or pcunshaded loop.
Point Cloud Import by Index

This node imports point data from a pcopen.
Point Cloud Iterate

This node advances to the next iteration point returned by pcopen.
Point Cloud Num Found

This node returns the number of points found by pcopen.
Point Cloud Open

This node opens a point cloud file and searches for points around a source position.
Point Cloud Unshaded

This node advances to the next unshaded iteration point returned by pcopen.
Point Cloud Write

This function writes data for the current shading point out to a point cloud file.
Point Count

Returns the number of points for all primitives in the given geometry.
Point In Group

Returns 1 if the point specified by the point number is in the group specified by the string.
Point Instance Procedural

The underlying procedural when using Fast Point Instancing with the instance render parameters.
Point Loop

Only available in Image3D VOP networks.
Point Replicate

The Point Replicate Procedural takes a number of input points and multiplies them, and processes the result using a CVEX script.
Pop

Removes the last element of an array and returns it.
Pose Difference

Compute the difference between point transforms on two SOP skeletons.
Power

Raises the first argument to the power of the second argument.
Primitive Attribute

Evaluates an attribute for a given primitive at the specified uv parametric location.
Primitive Intrinsic

Evaluates an intrinsic on a given primitive.
Primitive Normal

Returns the normal of a primitive (defined by its number) at the given uv parametric location.
Principled Shader

An artist-friendly shader that can model a large number of materials realistically.
Principled Shader

An artist-friendly shader that can model a large number of materials realistically.
Print

Generate a formatted text string.
Promote Layer Exports

Promotes the export variables from the Shader Layer struct to the parent shader
Properties
Pyro Blackbody

Converts a temperature value into color (chroma) and intensity according to the blackbody radiation model.
Pyro Color Correct

Provides color correction functions.
Pyro Color Model

Provides constant, artistic, and physically correct (blackbody) tint as well as color correction functions.
Pyro Color Volume

Provides functions for editing color fields by conditioning the field values, adding noise, filtering, and color correction.
Pyro Density Volume

Provides functions for editing fields such as density by conditioning the field values, adding noise, and filtering.
Pyro Displace
Pyro Field
Pyro Noise
Pyro Shader

Flexible, production-quality smoke, fire, and explosions shader.
Pyro Shader - Classic

Flexible, production-quality fire and smoke shader.
Pyro Shader Core

Provides the core functionality needed to build a high-quality volumetric shader.
Quaternion

Takes an angle and an axis and constructs the quaternion representing the rotation about that axis.
Quaternion Conjugate

Computes the conjugate of a quaternion.
Quaternion Distance

Computes distance between quaternions in radians.
Quaternion Invert

Takes an quaternion inverts it..
Quaternion Multiply

Performs a quaternion multiplication with its two inputs.
Quaternion to Angle/Axis

Converts a quaternion to angle/axis form.
Quaternion to Euler

Converts a quaternion to a vector representing euler angles.
Quaternion to Matrix3

Converts a vector4, representing a quaternion, to a matrix3 value, representing the same rotation.
RGB to HSV

Converts RGB color space to HSV color space.
RSL Gather Loop

Sends rays into the scene and contains a subnetwork of VOPs to operate on the information gathered from the shaders of surfaces hit by the rays.
Radians to Degrees

Converts radians to degrees.
Rainbow

Generates a non-repeating rainbow color ramp by modulating the hue over the range of the parametric coordinate s and using the given saturation and value to compute the HSV color.
Ramp Filter

Adds anti-aliased analytical filtering to the output of a Ramp Parameter VOP.
Ramp Parameter

Represents a user-editable ramp parameter.
Ramps

Generates repeating filtered ramps.
Random

Generates a random number based on the position in one, three, or four dimensions.
Random Binary Random Jitter

Generates a random number in a BRJ sequence.
Random Sobol

Generates a random number in a Sobol sequence.
Random Value
Ray Bounce Level

Returns the current ray-bounce level.
Ray Bounce Weight

Returns the amount that the current bounce level will contribute to the final pixel color.
Ray Hit

This operator sends a ray from the position P along the direction specified by the direction D, and returns the distance to the object intersected or a negative number if not object found.
Ray Trace

Sends a ray starting at origin P and in the direction specified by the normalized vector D.
Realistic Shoulder

Propagates rotation from the arm to the clavicle point in a KineFX skeleton.
Reflect

Returns the vector representing the reflection of the direction against the normal vector.
Reflected Light

Computes the amount of reflected light which hits the surface.
Refract

Computes the refraction ray given an incoming direction, the normalized normal and an index of refraction.
Refracted Light

Sends a ray starting at origin P and in the direction specified by the normalized vector I.
Regex Find

Finds the given regular expression in the string.
Regex Findall

Finds all instances of the given regular expression in the string.
Regex Match

Result 1 if the entire input string matches the expression.
Regex Replace

Replaces instances of find_regex with replace_regex.
Regex Split

Splits the given string based on regex match.
Relative to Bounding Box

Returns the relative position of the point given with respect to the bounding box of the specified geometry.
Relative to Point Bounding Box

Returns the relative position of the point given with respect to the bounding box of the specified geometry.
Remove Index

Removes an item at the given index from an array.
Remove Key

Removes an item at the given key from a dictionary.
Remove Point

Removes points from the geometry.
Remove Primitive
Remove Value

Removes an item from an array.
Render State

Gets state information from the renderer.
RenderMan Bias
RenderMan Calculate Normal
RenderMan Deriv
RenderMan Du/Dv
RenderMan Environment Map
RenderMan Gain
RenderMan Illuminance Loop
RenderMan Illuminate Construct
RenderMan Import Value
RenderMan Indirect Diffuse
RenderMan Logarithm
RenderMan Occlusion
RenderMan Ray Information
RenderMan Render State Information
RenderMan Shadow Map
RenderMan Step
RenderMan Surface Color
RenderMan Texture Map
RenderMan Texture Map Information
RenderMan Transform
RenderMan Transform Color
RenderMan Z-Depth From Camera
Reorder

Reorders items in an array or string.
Report Error

Optionally report a custom VEX error or warning.
Reshape Value

Modulates input value using a variety of methods.
Resolution

Returns the pixel resolution of an input.
Resolve Mapping Attribute

Resolves a mapping dictionary attribute to a KineFX point number.
Rest Position

Checks if the geometry attribute rest is bound and, if so, uses it as the rest position for shading.
Return

Generates a return statement inside a method or a function defined by the parent subnet.
Reverse

Adds an item to an array or string.
Reverse Foot

Rotates the foot around custom pivots specific to a reverse foot KineFX set-up.
Rings

Generates repeating filtered rings.
Ripples

Generates repeating ripples.
Rotate

Applies a rotation by 'angle' radians to the given 3×3 or 4×4 matrix.
Rotate by Quaternion

Rotates a vector by a quaternion.
Round to Integer

Rounds the argument to the closest integer.
Rounded Hexes

Generates repeating filtered rounded hexagons.
Rounded Stars

Generates repeating filtered rounded five-pointed stars.
Run External Program Procedural

This procedural will run an external application in order to generate geometry at render time.
SSS Component

Adds energy conservation functionality and additional controls to the Physical SSS VOP.
Sample Sphere

Samples the interior or surface of the unit circle, sphere, or hypersphere, within a max angle of a direction.
Scale

Scales a 3×3 or 4×4 matrix by 'amount' units along the x,y, and z axes.
Scales

Generates a scale-like pattern and returns the displaced position, normal, and displacement amount.
Sensor Panorama Color

Requests the rendered color from a specified direction
Sensor Panorama Cone

Returns an average direction, color, depth, and strength.
Sensor Panorama Create

Renders the surrounding environment
Sensor Panorama Depth

Requests the rendered depth from a specified direction
Sensor Panorama Save

Saves the rendered panorama to a specified output file
Sensor Save

Saves sensor data to image files.
Set Agent Clip Names

Sets the current animation clips for an agent primitive.
Set Agent Clip Times

Sets the current times for an agent primitive’s animation clips.
Set Agent Clip Weights

Sets the blend weights for an agent primitive’s animation clips.
Set Agent Layer

Sets the current layers or collision layers of an agent primitive.
Set Agent Transforms

Overrides the transforms of an agent primitive.
Set Attribute
Set CHOP Attribute

Sets a CHOP attribute value.
Set Channel Tranform

Sets a transform value when evaluating a Channel VOP in Tranlate/Rotate/Scale mode.
Set Channel Value

Sets a channel value when evaluating a Channel VOP in Channel/Sample modes.
Set Dictionary Element

Sets the value at the specified key.
Set Element

Sets the element at the specified index.
Set Layer Component

Sets a layer’s components to new values.
Set Layer Export

Adds layer exports to the Shader Layer struct
Set Matrix Component

Assigns a value to one of the matrix’s components.
Set Matrix2 Component

Assigns a value to one of the matrix2's components.
Set Matrix3 Component

Assigns a value to one of the matrix3's components.
Set Point Transform

Sets one point transform at a given point ID.
Set Point Transforms

Sets arrays of point transforms at an array of point IDs.
Set Primitive Vertex
Set Vector Component

Assigns a value to one of the vector’s components.
Set Vector2 Component

Assigns a value to one of the vector2's components.
Set Vector4 Component

Assigns a value to one of the vector4's components.
Shader Output Export Variables

Represents export parameters in a shader call.
Shader Output Global Variables

Represents global variables that are bound as output parameters in a shader call.
Shading Area

Computes the shading area of the given variable.
Shading Derivative

Computes the derivative of a given variable with respect to the s or t parametric coordinate.
Shading Layer Parameter

Creates a parameter to appear in the signature of the VEX function defined by the VOP network (VOPNET).
Shading Normal

Computes the normal at the location specified by the P position.
Shadow

This shader calls the shadow shader inside an illuminance loop.
Shadow Map

Shadow Map treats the depth map as if the image were rendered from a light source.
Shadow Matte

Implements a shadowmatte shader that occludes geometry behind the surface being rendered.
Sign

Returns -1 if the input is less than 0, otherwise it returns 1.
Sine

Performs a sine function.
Skin Shader Core

A skin shader with three levels of subsurface scattering.
Sky Box

Creates a sky noise pattern with volumetric clouds.
Slice

Slices a sub-string or sub-array of a string or array.
Smooth

Computes a number between zero and one.
Smooth Rotation

Returns the closest equivalent Euler rotations to a reference rotation.
Snippet

Runs a VEX snippet to modify the incoming values.
Soft Clip

Increases or decreases contrast for values at the top of the input range.
Soft Dots

Generates repeating soft dots.
Sort

Returns the array sorted in increasing order.
Specular

Generates a color using the selected specular lighting model calculation.
Specular Sheen

Generates a color using a specular lighting model with a Fresnel falloff calculation.
Spherical Linear Interp

Computes a spherical linear interpolation between its two quaternion inputs, and outputs the intermediate quaternion.
Splatter

Generates a splatter pattern and returns the splatter amount.
Spline

Computes either a Catmull-Rom (Cardinal) spline or a Linear spline between the specified key points, given an interpolant (u) in the domain of the spline.
Split String

Splits a string into tokens.
Sprites Procedural

This procedural will render points as sprites.
Square Root

Computes the square root of the argument.
Starts With

Result 1 if the string starts with the specified string.
Stash Transform

Stashes a KineFX transform matrix as a constant.
String Length

Returns the length of the string.
String to Character

Converts an UTF8 string into a codepoint.
Strip

Strips leading and trailing whitespace from a string.
Stripes

Generates repeating filtered stripes.
Struct

Creates, modifies, or de-structures an instance of a structured datatype.
Struct Pack

Bundles input values into an instance of an ad-hoc struct.
Struct Unpack

Extracts one or more values from a struct by member name.
Sub Network

Contains other VOP operators.
Subnet Connector

Represents an input or an output (or both) of the parent VOP subnet.
Subnet Input

Allows the connection of operators outside a subnet to operators inside the subnet.
Subnet Output

Allows the connection of operators inside a subnet to operators outside the subnet.
Subtract

Outputs the result of subtracting all its inputs.
Subtract Constant

Subtracts the specified constant value from the incoming integer, float, vector or vector4 value.
Surface Color

Generates a basic color with a choice of tinting with the point color and/or a color map.
Surface Distance

Finds the shortest distance between a point and a source point group.
Switch

Switches between network branches based on the value of an input.
Switch Lighting BSDF

Use a different bsdf for direct or indirect lighting.
Swizzle Vector

Rearranges components of a vector.
Swizzle Vector2

Rearranges components of a vector2.
Swizzle Vector4

Rearranges components of a vector4.
Tangent

Performs a tangent function.
Tangent Normal

Transform an input normal to UV/tangent space
Tangent Normal Remap

Transform an input normal from UV/tangent to current space
Tangent Normals

Exports shader normals as a render plane.
Tetrahedron Adjacent

Returns primitive number of an adjacent tetrahedron.
Tetrahedron Adjacent

Returns vertex indices of each face of a tetrahedron.
Texture

Computes a filtered sample of the texture map specified and returns an RGB or RGBA color.
Texture 3D

Returns the value of a 3D image at a specified position within that image.
Texture 3D Box

Queries the 3D texture map specified and returns the bounding box information for the given channel in the min and max corner vectors.
Texture Map
Thin Film Fresnel

Computes the thin film reflection and refraction contributions given a normalized incident ray, a normalized surface normal, and an index of refraction.
Tiled Boxes

Generates staggered rectangular tiles.
Tiled Hexagons

Generates staggered hexagonal tiles.
Timing

Returns the frame range and rate of the given input.
Title Case

Returns a string that is the titlecase version of the input string.
To Lower

Returns a string that is the lower case version of the input string.
To NDC

Transforms a position into normal device coordinates.
To NDC
To Polar

Converts cartesian coordinates to polar coordinates.
To Upper

Returns a string that is the upper case version of the input string.
Trace

Uses the vex gather function to send a ray and return with the reflected or refracted colors.
Transform

Transforms a vector to or from an object’s transform space, or one of several other spaces, such as world or camera space.
Transform From Path

Constructs a KineFX transform matrix from a position on a path.
Transform From Surface

Constructs a KineFX transform matrix from a position on a geometry’s surface.
Transform Matrix
Translate

Translates a 4×4 matrix 'amount' units along the x,y,z and possibly w axes.
Transpose
Trigonometric Functions

Performs a variety of trigonometric functions.
Turbulent Noise

Can compute three types of 1D and 3D noise with the ability to compute turbulence with roughness and attenuation.
Two Bone IK

Perform a simple two-bone IK solve
Two Sided

Generates a two sided surface.
Two Way Switch

Takes an integer input.
USD Global Variables

Provides outputs representing commonly used input variables for processing USD primitive attributes inside an Attribute VOP LOP.
USD Preview Surface

USD Preview Surface shader
USD Prim Var Reader
USD Prim Var Reader

USD Prim Var Reader shader
USD Transform 2D
USD Transform 2D
USD Transform 2D

Represents a standard USD primitive for transforming texture co-ordinates.
USD UV Texture

Represents a standard USD primitive for looking up texture values.
UV Coords

Returns texture coordinates or geometric s and t, depending on what is defined.
UV Noise

Disturbs the incoming parametric s and t coordinates using anti aliased noise generated from the Surface Position input.
UV Planar Project

Computes UV co-ordinates projected along a single axis, derived from the position of an object, and generates a mask relative to the projection axis.
UV Position
UV Project

Assigns texture coordinates based on the specified projection type.
UV Transform

Transforms texture coordinates by the inverse of the matrix consisting of the translation, rotation, and scale amounts.
UV Tri-planar Project

Projects texture maps along X, Y, and Z axes and blends them together at the seams.
Undulatus

Generates a 2D, wave like cloud pattern.
Unified Noise

Presents a unified interface and uniform output range for all the noise types available in VEX.
Unified Noise Static

Presents a unified interface and uniform output range for all the noise types available in VEX.
Unique Value Count of Attribute
Unique Values of Attribute
VOP Force Global

Provides outputs that represent all the global variables for the Force VOP network type.
VOP Force Output Variables

Simple output variable for VOP Force Networks.
Vector Cast

Converts between different vector types.
Vector To Float

Unpacks a vector into its three components.
Vector To Quaternion

Takes an angle/axis vector and constructs the quaternion representing the rotation about that axis.
Vector To Vector4

Converts a vector to a vector4.
Vector to Matrix3

Converts rows values to a 3×3 matrix value.
Vector to Vector2

Converts a vector to a vector2 and also returns the third component of the vector.
Vector2 To Float

Unpacks a vector2 into its two components.
Vector2 To Vector

Converts a vector2 to a vector.
Vector2 To Vector4

Converts a pair of vector2s into a vector4.
Vector2 to Matrix2

Converts rows values to a 2×2 matrix value.
Vector4 to Float

Unpacks a vector4 into its four components.
Vector4 to Matrix

Converts rows values to a 4×4 matrix value.
Vector4 to Vector

Converts a vector4 to a vector and also returns the fourth component of the vector4.
Vector4 to Vector2

Converts a vector4 to a pair of vector2s..
Veins

Generates an anti-aliased vein pattern that can be used in any VEX context.
Vex Volume Procedural

This procedural will generate a volume from a CVEX shader.
Visualize

Exports a vis_ prefixed attribute.
Volume Density to Opacity

Computes the opacity of a uniform volume given a density.
Volume Gradient

Calculates the gradient of a volume primitive stored in a disk file.
Volume Index

Gets the value of a voxel from a volume primitive stored in a disk file.
Volume Index To Pos

Calculates the position of a voxel in a volume primitive stored in a disk file.
Volume Index Vector

Gets the vector value of a voxel from a volume primitive stored in a disk file.
Volume Model

A shading model for volume rendering.
Volume Pos To Index

Calculates the voxel closest to a voxel of a volume primitive stored in a disk file.
Volume Resolution

Gets the resolution of a volume primitive stored in a disk file.
Volume Sample

Samples the value of a volume primitive stored in a disk file.
Volume Sample Vector

Samples the vector value of a volume primitive stored in a disk file.
Volume VOP Global Parameters

Provides outputs that represent all the global variables for the Volume VOP network type.
Volume VOP Output Variables

Simple output variable for Volume VOP Networks.
Voronoi Noise

Computes 1D, 3D, and 4D Voronoi noise, which is similar to Worley noise but has additional control over jittering.
Wave Vector

Computes the wave vector for a given index in a grid of specified size.
Waves

Simulates rolling waves with choppiness of various frequencies, and outputs the positional and normal displacements as well as the amount of displacement.
Wire Pattern

Returns float between 0 and 1 which defines a wire grid pattern useful for simulating screens or visualizing parametric or texture coordinates.
Worley Noise

Computes 1D, 3D, and 4D Worley noise, which is synonymous with cell noise.
XPU Pyro Preview

Simplified smoke, fire, and explosions shader for Karma XPU.
XYZ Distance

Finds closest position on a primitive in a given geometry file.
Xor

Performs a logical xor operation between its inputs.
argsort

Returns the indices of a sorted version of an array.
roundededge

Blends the normals between faces within specified radius.