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The CHOP context allows users to change values of channels in a CHOP. Each CHOP function works on a single sample of a single channel of a CHOP.
Constraints ¶
CHOP contraints make use of VEX structures defined in $HFS/houdini/vex/include/chop_constraints.h.
chopTRS ¶
Holds transform channels within a structure.
struct chopTRS
{
vector t; // tx ty tz channels
vector r; // rx ry rz channels
vector s; // sx ry rz channels
void fromIdentity();
void fromMatrix(const matrix m; const vector pivot; const int trs; const int xyz);
void fromMatrix(const matrix m);
}chopConstraintContext ¶
Holds the current evaluated transform channels within a structure. This abstracts the global variables 'C' and 'I', so you don’t have to worry about the current time and the current channel index.
struct chopConstraintContext
{
vector t; // tx ty tz channels
vector r; // rx ry rz channels
vector s; // sx sy sz channels
void init();
void init( vector t0; vector r0; vector s0; const string prefix0 );
void fromMatrix(const matrix m;
const vector pivot; const int trs; const int xyz);
void fromMatrix(const matrix m);
chopTRS fetchInput( const int i );
float fetchInput( const int i; const string name; int result );
float fetchInput( const int i; const int index; int result );
matrix fetchInputMatrix( const int i );
int isConnected( const int i );
int numInputs();
// Evaluate a channel input by name
float chinput( int i; const string name; int ret );
// Evaluate a float parameter on the current CHOP node
float chf( const string parm );
// Evaluate an integer parameter on the current CHOP node
int chi( const string parm );
// Evaluate a vector parameter on the current CHOP node
vector chv( const string parm );
}Here’s an example of how to blend the translations of the 4 inputs.
// Declare the context // This is done automatically on transform wrangles chopConstraintContext c; // Fetch transform inputs chopTRS c0 = c->fetchInput(0); chopTRS c1 = c->fetchInput(1); chopTRS c2 = c->fetchInput(2); chopTRS c3 = c->fetchInput(3); matrix m0 = c->fetchInputMatrix(0); matrix m1 = c->fetchInputMatrix(1); matrix m2 = c->fetchInputMatrix(2); matrix m3 = c->fetchInputMatrix(3); // Compute transform @t = c0.t + c1.t + c2.t + c3.t; @t *= 0.25; @r = c0.r; @s = c0.s;
Globals ¶
float |
V
|
Value of the current sample. This variable should be set to the new value by the function. The variable is initialized to the value of the first input’s channels. |
|
int |
I
|
Read only |
Index or sample number of the current channel. Time dependent only in Current Frame mode. |
int |
IN
|
Read only |
Index or sample number of the current channel. Non Time Dependent. |
int |
S
|
Read only |
Index of the start of the current channel. This is the index of the first sample. |
int |
E
|
Read only |
Index of the last sample (end sample). |
float |
SR
|
Read only |
Sample rate for the current channel. |
int |
L
|
Read only |
Length of the channel (total number of samples). |
int |
C
|
Read only |
Channel number for the current channel. When processing multiple channels, this is the index of the channel currently being evaluated. |
int |
NC
|
Read only |
Total number of channels the CHOP will affect. |
string |
CN
|
Read only |
Name of the current channel. |
float |
FF
|
Read only |
Frame number as a float corresponding to the sample being evaluated. Time dependent only in Current Frame mode. |
float |
FFN
|
Read only |
Frame number as a float corresponding to the sample being evaluated. Non Time Dependent. |
float |
Frame
|
Read only |
Frame number as a float corresponding to the evaluation time. Forces Time Dependent. |
float |
T
|
Read only |
Time in seconds corresponding to the sample being evaluated. Time dependent only in Current Frame mode. |
float |
TN
|
Read only |
Time in seconds corresponding to the sample being evaluated. Non Time Dependent. |
float |
Time
|
Read only |
Time in seconds corresponding to the evaluation time. Forces Time Dependent. |
Functions ¶
-
Returns the derivative of the given value with respect to U.
-
Returns the derivative of the given value with respect to V.
-
Returns the derivative of the given value with respect to the 3rd axis (for volume rendering).
-
Multiply matrices.
-
Pre multiply matrices.
-
Returns the absolute value of the argument.
-
Returns the full path of a file.
-
Returns the inverse cosine of the argument.
-
Adds an attribute to a geometry.
-
Adds a detail attribute to a geometry.
-
Adds a point to the geometry.
-
Adds a point attribute to a geometry.
-
Adds a primitive to the geometry.
-
Adds a primitive attribute to a geometry.
-
Adds a mapping for an attribute to a local variable.
-
Adds a vertex to a primitive in a geometry.
-
Adds a vertex attribute to a geometry.
-
Appends to a geometry’s visualizer detail attribute.
-
Add a clip into an agent’s definition.
-
Returns the number of channels in an agent primitive’s rig.
-
Returns the names of the channels in an agent primitive’s rig.
-
Returns the current value of an agent primitive’s channel.
-
Returns the current values of an agent primitive’s channels.
-
Returns all of the animation clips that have been loaded for an agent primitive.
-
Finds the index of a channel in an agent’s animation clip.
-
Returns the names of the channels in an agent’s animation clip.
-
Blends values according to an agent’s animation layers.
-
Returns the length (in seconds) of an agent’s animation clip.
-
Returns an agent primitive’s current animation clips.
-
Samples a channel of an agent’s clip at a specific time.
-
Samples an agent’s animation clip at a specific time.
-
Returns the sample rate of an agent’s animation clip.
-
Samples an agent’s animation clip at a specific time.
-
Returns the start time (in seconds) of an agent’s animation clip.
-
Returns the current times for an agent primitive’s animation clips.
-
Returns the transform groups for an agent primitive’s current animation clips.
-
Returns the blend weights for an agent primitive’s animation clips.
-
Returns the name of the collision layer of an agent primitive.
-
Returns the names of an agent primitive’s collision layers.
-
Returns the name of the current layer of an agent primitive.
-
Returns the names of an agent primitive’s current layers.
-
Finds the index of a clip in an agent’s definition.
-
Finds the index of a layer in an agent’s definition.
-
Finds the index of a transform group in an agent’s definition.
-
Returns the transform that each shape in an agent’s layer is bound to.
-
Returns all of the layers that have been loaded for an agent primitive.
-
Returns the names of the shapes referenced by an agent primitive’s layer.
-
Returns the current local space transform of an agent primitive’s bone.
-
Returns the current local space transforms of an agent primitive.
-
Returns the agent definition’s metadata dictionary.
-
Returns the local space rest transform for an agent primitive’s joint.
-
Returns the world space rest transform for an agent primitive’s joint.
-
Returns the child transforms of a transform in an agent primitive’s rig.
-
Finds the index of a transform in an agent primitive’s rig.
-
Finds the index of a channel in an agent primitive’s rig.
-
Returns the parent transform of a transform in an agent primitive’s rig.
-
Applies a full-body inverse kinematics algorithm to an agent’s skeleton.
-
Returns the number of transforms in an agent primitive’s rig.
-
Returns whether a transform is a member of the specified transform group.
-
agenttransformgroupmemberchannel
Returns whether a channel is a member of the specified transform group.
-
Returns the names of the transform groups in an agent’s definition.
-
Returns the weight of a member of the specified transform group.
-
Returns the name of each transform in an agent primitive’s rig.
-
Converts transforms from world space to local space for an agent primitive.
-
Converts transforms from local space to world space for an agent primitive.
-
Returns the current world space transform of an agent primitive’s bone.
-
Returns the current world space transforms of an agent primitive.
-
Returns the albedo (percentage of reflected light) for a bsdf given the outgoing light direction.
-
Generates alligator noise.
-
Adds an item to an array or string.
-
Returns the area of the micropolygon containing a variable such as P.
-
Returns the indices of a sorted version of an array.
-
Efficiently creates an array from its arguments.
-
Returns a specular BSDF using the Ashikhmin shading model.
-
Returns the inverse sine of the argument.
-
Returns 1 if the VEX assertions are enabled (see HOUDINI_VEX_ASSERT) or 0 if assertions are disabled. Used the implement the assert macro.
-
An efficient way of extracting the components of a vector or matrix into float variables.
-
Returns the inverse tangent of the argument.
-
Returns the inverse tangent of y/x.
-
Converts a string to a float.
-
Converts a string to an integer.
-
Computes attenuated falloff.
-
Reads the value of an attribute from geometry.
-
Returns the class of a geometry attribute.
-
Returns the data id of a geometry attribute.
-
Returns the size of a geometry attribute.
-
Returns the type of a geometry attribute.
-
Returns the transformation metadata of a geometry attribute.
-
Returns the average value of the input(s)
-
Compute the color value of an incandescent black body.
-
Returns a Blinn BSDF or computes Blinn shading.
-
Returns the cube root of the argument.
-
Returns the smallest integer greater than or equal to the argument.
-
Evaluates a channel (or parameter) and return its value.
-
Evaluates a channel (or parameter) and return its value.
-
Evaluates a channel (or parameter) and return its value.
-
Evaluates a channel (or parameter) and return its value.
-
Adds new channels to a CHOP node.
-
Reads from a CHOP attribute.
-
Reads CHOP attribute names of a given attribute class from a CHOP input.
-
Evaluates a key-value dictionary parameter and return its value.
-
Returns the sample number of the last sample in a given CHOP input.
-
Returns the frame corresponding to the last sample of the input specified.
-
Returns the time corresponding to the last sample of the input specified.
-
Evaluates a channel with a new segment expression.
-
Evaluates a channel with a new segment expression at a given frame.
-
Evaluates a channel with a new segment expression at a given time.
-
Evaluates a channel (or parameter) and return its value.
-
Evaluates a channel (or parameter) and return its value.
-
Returns a chiang BSDF.
-
Returns a chiang_fur BSDF.
-
Resolves a channel string (or parameter) and return op_id, parm_index and vector_index.
-
Returns the channel index from a input given a channel name.
-
Returns the value of a channel at the specified sample.
-
Computes the minimum and maximum value of samples in an input channel.
-
Returns the name of a numbered channel.
-
Returns all the CHOP channel names of a given CHOP input.
-
Returns the number of channels in the input specified.
-
Returns the value of a CHOP channel at the specified sample.
-
Returns the value of a CHOP local transform channel at the specified sample.
-
Returns the value of a CHOP local transform channel at the specified sample and evaluation time.
-
Returns the value of a CHOP channel at the specified sample and evaluation time.
-
Evaluates a channel (or parameter) and return its value.
-
Clears a channel primitive, removing all keys.
-
Destroy an existing key from a channel primitive.
-
Get the end time of a channel primitive.
-
Evaluate a channel primitive at the given time.
-
Insert a key into a channel primitive.
-
Get the number of keys in a channel primitive.
-
Get the key times of a channel primitive.
-
Get the key values of a channel primitive.
-
Get the length of a channel primitive.
-
Set the acceleration of a channel primitive key.
-
Set the slope of a channel primitive key.
-
Set the value of a channel primitive key.
-
Get the start time of a channel primitive.
-
Converts an unicode codepoint to a UTF8 string.
-
Evaluates a ramp parameter and return its value.
-
Evaluates the derivative of a parm parameter with respect to position.
-
Returns the sample rate of the input specified.
-
Returns the value of CHOP context temporary buffer at the specified index.
-
Removes channels from a CHOP node.
-
Removes a CHOP attribute.
-
Renames a CHOP channel.
-
Resize the CHOP context temporary buffer
-
Evaluates a channel (or parameter) and return its value.
-
Sets the value of a CHOP attribute.
-
Sets the length of the CHOP channel data.
-
Sets the sampling rate of the CHOP channel data.
-
Sets the CHOP start sample in the channel data.
-
Evaluates an operator path parameter and return the path to the operator.
-
Returns the raw string channel (or parameter).
-
Returns the start sample of the input specified.
-
Returns the frame corresponding to the first sample of the input specified.
-
Returns the time corresponding to the first sample of the input specified.
-
Evaluates a channel or parameter, and return its value.
-
Evaluates a channel or parameter, and return its value.
-
Writes a value of CHOP context temporary buffer at the specified index.
-
Samples a Catmull-Rom (Cardinal) spline defined by position/value keys.
-
Returns value clamped between min and max.
-
Clip the line segment between p0 and p1.
-
Looks up a (filtered) color from a texture file.
-
Combines Local and Parent Transforms with Scale Inheritance.
-
In shading contexts, computes a normal. In the SOP contexts, sets how/whether to recompute normals.
-
Concatenate all the strings specified to form a single string.
-
Returns a cone reflection BSDF.
-
Returns the cosine of the argument.
-
Returns the hyperbolic cosine of the argument.
-
Returns the cosine of the argument scaled by Pi.
-
Depending on the value of c, returns the translate (c=0), rotate (c=1), scale (c=2), or shears (c=3) component of the transform (xform).
-
Creates a cumulative distribution function (CDF) from an array of probability density function (PDF) values.
-
Creates a probability density function from an array of input values.
-
Returns the capture transform associated with a Capture Region SOP.
-
Returns the deform transform associated with a Capture Region SOP.
-
Returns the capture or deform transform associated with a Capture Region SOP based on the global capture override flag.
-
Returns the cross product between the two vectors.
-
Samples a Catmull-Rom (Cardinal) spline defined by uniformly spaced keys.
-
Transforms between color spaces.
-
Computes divergence free noise based on simplex noise.
-
Computes divergence free noise in the plane based on simplex noise.
-
Computes divergence free noise based on Perlin noise.
-
Computes 2d divergence free noise based on Perlin noise.
-
Computes divergence free noise based on Simplex noise.
-
Computes 2d divergence free noise based on simplex noise.
-
Evaluates the length of an arc on a primitive defined by an array of points using parametric uv coordinates.
-
Creates a bsdf object from two CVEX shader strings.
-
Generates Worley (cellular) noise using a Chebyshev distance metric.
-
Decodes a variable name that was previously encoded.
-
Decodes a geometry attribute name that was previously encoded.
-
Decodes a node parameter name that was previously encoded.
-
Decodes a UTF8 string into a series of codepoints.
-
Converts the argument from radians into degrees.
-
The depthmap functions work on an image which was rendered as a z-depth image from mantra.
-
Reads the value of a detail attribute value from a geometry.
-
Reads a detail attribute value from a geometry.
-
Returns the size of a geometry detail attribute.
-
Returns the type of a geometry detail attribute.
-
Returns the type info of a geometry attribute.
-
Reads the value of a detail intrinsic from a geometry.
-
Computes the determinant of the matrix.
-
Extracts diagonal entries or constructs a diagonal matrix.
-
Diagonalizes Symmetric Matrices.
-
Returns a diffuse BSDF or computes diffuse shading.
-
Computes the rotation matrix or quaternion which rotates the vector a onto the vector b.
-
Returns the distance between two points.
-
Returns the squared distance between the two points.
-
This function returns the closest distance between the point Q and the infinite line going through O parallel to vector D.
-
This function returns the closest distance between the point Q and the semi-finite ray starting at O and extending in the direction D.
-
This function returns the closest distance between the point Q and a finite line segment between points P0 and P1.
-
Returns the dot product between the arguments.
-
Reads the z-records stored in a pixel of a deep shadow map or deep camera map.
-
Takes the value in one range and shifts it to the corresponding value in a new range.
-
Computes the eigenvalues of a 3×3 matrix.
-
Encodes any string into a valid variable name.
-
Encodes any string into a valid geometry attribute name.
-
Encodes any string into a valid node parameter name.
-
Encodes a UTF8 string from a series of codepoints.
-
Indicates the string ends with the specified string.
-
Returns the color of the environment texture.
-
Gauss error function.
-
Inverse Gauss error function.
-
Gauss error function’s complement.
-
Reports a custom runtime VEX error.
-
Creates a vector4 representing a quaternion from euler angles.
-
Evaluates a bsdf given two vectors.
-
Returns the exponential function of the argument.
-
Perform UDIM or UVTILE texture filename expansion.
-
Returns an array of point numbers corresponding to a group string.
-
Returns an array of prim numbers corresponding to a group string.
-
Returns an array of linear vertex numbers corresponding to a group string.
-
Extracts Local Transform from a World Transform with Scale Inheritance.
-
Samples the velocity field defined by a set of vortex filaments.
-
Returns file system status for a given file.
-
Computes an importance sample based on the given filter type and input uv.
-
Returns the anti-aliased weight of the step function.
-
Finds an item in an array or string.
-
Finds a primitive/point/vertex that has a certain attribute value.
-
Returns number of elements where an integer or string attribute has a certain value.
-
Finds the largest item smaller than a target value in an array.
-
Finds the largest item smaller than a target value in a sorted array.
-
Finds an item in a sorted array.
-
Takes the value in one range and shifts it to the corresponding value in a new range.
-
Takes the value in the range (0, 1) and shifts it to the corresponding value in a new range.
-
Takes the value in the range (1, 0) and shifts it to the corresponding value in a new range.
-
Takes the value in the range (-1, 1) and shifts it to the corresponding value in a new range.
-
Returns the largest integer less than or equal to the argument.
-
Generates 1D and 3D Perlin Flow Noise from 3D and 4D data.
-
There are two forms of Perlin-style noise: a non-periodic noise which changes randomly throughout N-dimensional space, and a periodic form which repeats over a given range of space.
-
Returns the fractional component of the floating point number.
-
Computes the fresnel reflection/refraction contributions given an incoming vector, surface normal (both normalized), and an index of refraction (eta).
-
Transforms a position from normal device coordinates to the coordinates in the appropriate space.
-
If dot(I, Nref) is less than zero, N will be negated.
-
Returns a handle to the current geometry.
-
Returns an oppath: string to unwrap the geometry in-place.
-
Reads an attribute value from geometry, with validity check.
-
Copies the value of a geometry attribute into a variable and returns a success flag.
-
Sets two vectors to the minimum and maximum corners of the bounding box for the geometry.
-
Returns the center of the bounding box for the geometry.
-
Returns the maximum of the bounding box for the geometry.
-
Returns the minimum of the bounding box for the geometry.
-
Returns the size of the bounding box for the geometry.
-
Returns the bounding box of the geometry specified by the filename.
-
Extracts a single component of a vector type, matrix type, or array.
-
Gets the transform of a packed primitive.
-
Sets two vectors to the minimum and maximum corners of the bounding box for the geometry.
-
Returns the center of the bounding box for the geometry.
-
Returns the maximum of the bounding box for the geometry.
-
Returns the minimum of the bounding box for the geometry.
-
Returns the size of the bounding box for the geometry.
-
Returns a transform from one space to another.
-
Returns a ggx BSDF.
-
Returns the gradient of a field.
-
Evaluates a simplex noise field.
-
Evaluates a simplex noise field and its derivatives.
-
Returns a BSDF for shading hair.
-
Test string for UDIM or UVTILE patterns.
-
Checks whether a geometry attribute exists.
-
Returns if a geometry detail attribute exists.
-
Returns if a geometry point attribute exists.
-
Returns if a geometry prim attribute exists.
-
Returns if a geometry vertex attribute exists.
-
Returns the destination point of a half-edge.
-
Returns the destination vertex of a half-edge.
-
Returns the number of half-edges equivalent to a given half-edge.
-
Determines whether a two half-edges are equivalent (represent the same edge).
-
Determines whether a half-edge number corresponds to a primary half-edge.
-
Determines whether a half-edge number corresponds to a valid half-edge.
-
Returns the half-edge that follows a given half-edge in its polygon.
-
Returns the next half-edges equivalent to a given half-edge.
-
Returns the point into which the vertex following the destination vertex of a half-edge in its primitive is wired.
-
Returns the vertex following the destination vertex of a half-edge in its primitive.
-
Returns the point into which the vertex that precedes the source vertex of a half-edge in its primitive is wired.
-
Returns the vertex that precedes the source vertex of a half-edge in its primitive.
-
Returns the half-edge that precedes a given half-edge in its polygon.
-
Returns the primitive that contains a half-edge.
-
Returns the primary half-edge equivalent to a given half-edge.
-
Returns the source point of a half-edge.
-
Returns the source vertex of a half-edge.
-
Returns an anisotropic volumetric BSDF, which can scatter light forward or backward.
-
Returns primitive number of an adjacent hexahedron.
-
Returns vertex indices of each face of a hexahedron.
-
Generates noise matching the output of the Hscript noise() expression function.
-
Produces the exact same results as the Houdini expression function of the same name.
-
Generates turbulence matching the output of the HScript turb() expression function.
-
Convert HSV color space into RGB color space.
-
Returns an identity matrix.
-
Finds a point by its id attribute.
-
Finds a primitive by its id attribute.
-
Remaps a texture coordinate to another coordinate in the map to optimize sampling of brighter areas.
-
Returns 1 if the edge specified by the point pair is in the group specified by the string.
-
Returns 1 if the point specified by the point number is in the group specified by the string.
-
Returns 1 if the primitive specified by the primitive number is in the group specified by the string.
-
Inserts an item, array, or string into an array or string.
-
Creates an instance transform matrix.
-
Computes irradiance from the given Hosek Sky on a horizontal surface
-
Interpolates a value across the currently shaded micropolygon.
-
This function computes the first intersection of a ray with geometry.
-
Computes all intersections of the specified ray with geometry.
-
Inverts a matrix.
-
Returns 1 if the vertex specified by the vertex number is in the group specified by the string.
-
Inverses a linear interpolation between the values.
-
Returns 1 if all the characters in the string are alphabetic
-
Parameters in VEX can be overridden by geometry attributes (if the attributes exist on the surface being rendered).
-
Returns 1 if input_number is connected, or 0 if the input is not connected.
-
Returns 1 if all the characters in the string are numeric
-
Checks whether a value is a normal finite number.
-
Returns 1 if the Vex CHOP’s Unit Menu is currently set to 'frames', 0 otherwise.
-
Checks whether a value is a positive or negative infinity.
-
Checks whether a value is not a number.
-
Returns an isotropic BSDF, which scatters light equally in all directions.
-
Returns 1 if the Vex CHOP’s Unit Menu is currently set to 'samples', 0 otherwise.
-
Returns 1 if the Vex CHOP’s Unit Menu is currently set to 'seconds', 0 otherwise.
-
Checks if the index given is valid for the array or string given.
-
Check whether a VEX variable is varying or uniform.
-
Converts an integer to a string.
-
Concatenate all the strings of an array inserting a common spacer.
-
Converts a VEX dictionary into a JSON string.
-
Converts a JSON string into a VEX dictionary.
-
Returns all the keys in a dictionary.
-
Returns an interpolated value along a curve defined by a basis and key/position pairs.
-
Returns the length of an array.
-
Returns the magnitude of a vector.
-
Returns the squared distance of the vector or vector4.
-
Performs linear interpolation between the values.
-
Limits a unit value in a way that maintains uniformity and in-range consistency.
-
Samples a polyline between the key points.
-
Returns the natural logarithm of the argument.
-
Returns the logarithm (base 10) of the argument.
-
Computes a rotation matrix or angles to orient the negative z-axis along the vector (to-from) under the transformation.
-
Samples a polyline defined by linearly spaced values.
-
Strips leading whitespace from a string.
-
Compute the luminance of the RGB color specified by the parameters.
-
Creates an orthonormal basis given a z-axis vector.
-
Builds a 3×3 or 4×4 transform matrix.
-
Forces a string to conform to the rules for variable names.
-
Returns new BSDF that only includes the components specified by the mask.
-
This function returns 1 if the subject matches the pattern specified, or 0 if the subject doesn’t match.
-
Returns a BSDF that matches the output of the traditional VEX blinn function.
-
Returns a BSDF that matches the output of the traditional VEX specular function.
-
Once you get a handle to a metaball using metastart and metanext, you can query attributes of the metaball with metaimport.
-
Takes the ray defined by p0 and p1 and partitions it into zero or more sub-intervals where each interval intersects a cluster of metaballs from filename.
-
Iterate to the next metaball in the list of metaballs returned by the metastart() function.
-
Open a geometry file and return a handle for the metaballs of interest, at the position p.
-
Returns the metaweight of the geometry at position p.
-
Given a position in world space, returns the position of the closest point on a given geometry.
-
Generates Worley (cellular) noise using a Manhattan distance metric.
-
MaterialX compatible cellnoise
-
MaterialX compatible Perlin noise
-
MaterialX compatible Voronoi noise
-
MaterialX compatible Worley noise
-
Finds a point by its name attribute.
-
Finds a primitive by its name attribute.
-
Returns the camera space z-depth of the NDC z-depth value.
-
Finds the closest point in a geometry.
-
Finds the all the closest point in a geometry.
-
Returns the number of edges in the group.
-
Returns the point number of the next point connected to a given point.
-
Returns the number of points that are connected to the specified point.
-
Returns an array of the point numbers of the neighbours of a point.
-
Returns the number of inputs.
-
There are two forms of Perlin-style noise: a non-periodic noise which changes randomly throughout N-dimensional space, and a periodic form which repeats over a given range of space.
-
Derivatives of Perlin Noise.
-
Returns the induced matrix 1-norm.
-
Returns the Frobenius norm of a matrix.
-
Returns the induced matrix infinity-norm.
-
Returns the matrix max-norm.
-
Returns the matrix spectral norm.
-
Returns the normal for the diffuse component of a BSDF.
-
Returns a normalized vector.
-
Returns the number of points in the input or geometry file.
-
Returns the number of points in the group.
-
Returns the number of primitives in the input or geometry file.
-
Returns the number of primitives in the group.
-
Non-deterministic random number generation function.
-
Transforms a normal vector.
-
Returns the number of unique values from an integer or string attribute.
-
Returns the number of vertices in the input or geometry file.
-
Returns the number of vertices in the group.
-
Evaluates an ocean spectrum and samples the result at a given time and location.
-
Returns the names of active displays supported in Open Color IO
-
Returns the names of active views supported in Open Color IO
-
Imports attributes from OpenColorIO spaces.
-
Parse the color space from a string
-
Returns the names of roles supported in Open Color IO
-
Returns the names of color spaces supported in Open Color IO.
-
Transform colors using Open Color IO
-
Transform colors to a view using Open Color IO
-
These functions are similar to wnoise and vnoise.
-
Returns the integer value of the last sequence of digits of a string
-
Returns the full path for the given relative path
-
Resolves an operator path string and return its op_id.
-
Returns the parent bone transform associated with an OP.
-
Returns the parent transform associated with an OP.
-
Returns the parm transform associated with an OP.
-
Returns the preconstraint transform associated with an OP.
-
Returns the pre and parm transform associated with an OP.
-
Returns the pre and raw parm transform associated with an OP.
-
Returns the pretransform associated with an OP.
-
Returns the raw parm transform associated with an OP.
-
Returns the transform associated with an OP.
-
Converts an UTF8 string into a codepoint.
-
Create an orthographic projection matrix.
-
Evaluates a point attribute at the subdivision limit surface using Open Subdiv.
-
Evaluates a vertex attribute at the subdivision limit surface using Open Subdiv.
-
Outputs the Houdini face and UV coordinates corresponding to the given coordinates on an OSD patch.
-
Outputs the OSD patch and UV coordinates corresponding to the given coordinates on a Houdini polygon face.
-
Returns a list of patch IDs for the patches in a subdivision hull.
-
Returns the outer product between the arguments.
-
Transforms a normal vector from Object to World space.
-
Transforms a position value from Object to World space.
-
Transforms a direction vector from Object to World space.
-
Reversibly packs an integer into a finite, non-denormal float.
-
Transforms a packed primitive.
-
This function closes the handle associated with a pcopen function.
-
Returns a list of closest points from a file within a specified cone.
-
Returns a list of closest points from a file in a cone, taking into account their radii
-
Writes data to a point cloud inside a pciterate or a pcunshaded loop.
-
Returns the distance to the farthest point found in the search performed by pcopen.
-
Filters points found by pcopen using a simple reconstruction filter.
-
Returns a list of closest points from a file.
-
Returns a list of closest points from a file taking into account their radii.
-
Generates a point cloud.
-
Imports channel data from a point cloud inside a pciterate or a pcunshaded loop.
-
Imports channel data from a point cloud outside a pciterate or a pcunshaded loop.
-
Imports channel data from a point cloud outside a pciterate or a pcunshaded loop.
-
Imports channel data from a point cloud outside a pciterate or a pcunshaded loop.
-
Imports channel data from a point cloud outside a pciterate or a pcunshaded loop.
-
Imports channel data from a point cloud outside a pciterate or a pcunshaded loop.
-
Imports channel data from a point cloud outside a pciterate or a pcunshaded loop.
-
Imports channel data from a point cloud outside a pciterate or a pcunshaded loop.
-
This function can be used to iterate over all the points which were found in the pcopen query.
-
Returns a list of closest points to an infinite line from a specified file
-
Returns a list of closest points to an infinite line from a specified file
-
This node returns the number of points found by pcopen.
-
Returns a handle to a point cloud file.
-
Returns a handle to a point cloud file.
-
Changes the current iteration point to a leaf descendant of the current aggregate point.
-
Returns a list of closest points to a line segment from a specified file
-
Returns a list of closest points to a line segment from a specified file
-
Iterate over all of the points of a read-write channel which haven’t had any data written to the channel yet.
-
Writes data to a point cloud file.
-
Create a perspective projection matrix.
-
Returns a list of closest points from a file.
-
Samples a color from a photon map.
-
Computes the pseudo-inverse of a matrix.
-
Computes the distance and closest point of a point to an infinite plane.
-
Computes the intersection of a 3D sphere and an infinite 3D plane.
-
Converts an English noun to its plural.
-
There are two forms of Perlin-style noise: a non-periodic noise which changes randomly throughout N-dimensional space, and a periodic form which repeats over a given range of space.
-
Reads a point attribute value from a geometry.
-
Reads a point attribute value from a geometry and outputs a success/fail flag.
-
Returns the size of a geometry point attribute.
-
Returns the type of a geometry point attribute.
-
Returns the type info of a geometry attribute.
-
Finds and returns a half-edge with the given endpoints.
-
Finds and returns a half-edge with a given source point or with given source and destination points.
-
Returns the next half-edge with the same source as a given half-edge.
-
Returns an array of point localtransforms from an array of point indices.
-
Returns the list of primitives containing a point.
-
Returns a point transform from a point index.
-
Returns a rigid point transform from a point index.
-
Returns an array of point transforms from an array of point indices.
-
Returns an array of rigid point transforms from an array of point indices.
-
Returns a linear vertex number of a point in a geometry.
-
Returns the list of vertices connected to a point.
-
Computes the polar decomposition of a matrix.
-
Returns an array of the primitive numbers of the edge-neighbours of a polygon.
-
Removes the last element of an array and returns it.
-
Raises the first argument to the power of the second argument.
-
Determines if a point is inside or outside a triangle circumcircle.
-
Determines if a point is inside or outside a tetrahedron circumsphere.
-
Determines the orientation of a point with respect to a line.
-
Determines the orientation of a point with respect to a plane.
-
Pre multiply matrices.
-
Applies a pre rotation to the given matrix.
-
Prescales the given matrix in three directions simultaneously (X, Y, Z - given by the components of the scale_vector).
-
Pretranslates a matrix by a vector.
-
Reads a primitive attribute value from a geometry.
-
Interpolates the value of an attribute at a certain parametric (u, v) position and copies it into a variable.
-
Returns the normal of the primitive (prim_number) at parametric location u, v.
-
Evaluates the length of an arc on a primitive using parametric uv coordinates.
-
Reads a primitive attribute value from a geometry, outputting a success flag.
-
Returns the size of a geometry prim attribute.
-
Returns the type of a geometry prim attribute.
-
Returns the type info of a geometry attribute.
-
Returns position derivative on a primitive at a certain parametric (u, v) position.
-
Returns a list of primitives potentially intersecting a given bounding box.
-
Returns one of the half-edges contained in a primitive.
-
Finds the indices and weightings of the vertices that will compute an interior point given the UVW coordinates.
-
Reads a primitive intrinsic from a geometry.
-
Converts a primitive/vertex pair into a point number.
-
Returns the list of points on a primitive.
-
Interpolates the value of an attribute at a certain parametric (uvw) position.
-
Convert parametric UV locations on curve primitives between different spaces.
-
Converts a primitive/vertex pair into a linear vertex.
-
Returns number of vertices in a primitive in a geometry.
-
Returns the list of vertices on a primitive.
-
Prints a message only once, even in a loop.
-
Prints values to the console which started the VEX program.
-
Returns the product of a list of numbers.
-
Computes a filtered sample from a ptex texture map. Use texture instead.
-
This function returns the closest distance between the point Q and a finite line segment between points P0 and P1.
-
Transforms a vector from one space to another.
-
Adds an item to an array.
-
Simplex noise is very close to Perlin noise, except with the samples on a simplex mesh rather than a grid. This results in less grid artifacts. It also uses a higher order bspline to provide better derivatives. This is the periodic simplex noise
-
Periodic derivatives of Simplex Noise.
-
Converts a quaternion represented by a vector4 to a matrix3 representation.
-
Finds distance between two quaternions.
-
Inverts a quaternion rotation.
-
Multiplies two quaternions and returns the result.
-
Rotates a vector by a quaternion.
-
Creates a vector4 representing a quaternion.
-
Creates a euler angle representing a quaternion.
-
Converts the argument from degrees into radians.
-
Evaluates a Houdini-style ramp at a specific location.
-
Packs a set of arrays into a string-encoded ramp.
-
Unpacks a string-encoded ramp into a set of arrays.
-
Creates a random number between 0 and 1 from a seed.
-
Generate a random number based on the integer position in 1-4D space.
-
Generate a uniformly distributed random number.
-
Hashes floating point numbers to integers.
-
Hashes integer numbers to integers.
-
Generates a random Poisson variable given the mean to the distribution and a seed.
-
Hashes a string to an integer.
-
Generate a uniformly distributed random number.
-
Looks up an unfiltered color from a texture file.
-
Matches a regular expression in a string
-
Finds all instances of the given regular expression in the string
-
Returns 1 if the entire input string matches the expression
-
Replaces instances of regex_find with regex_replace
-
Splits the given string based on regex match.
-
Returns the vector representing the reflection of the direction against the normal.
-
Returns the refraction ray given an incoming direction, the normalized normal and an index of refraction.
-
Computes the relative path for two full paths.
-
Returns the relative position of the point given with respect to the bounding box of the geometry.
-
Returns the relative path to a file.
-
Returns the relative position of the point given with respect to the bounding box of the geometry.
-
Removes an attribute or group from the geometry.
-
Removes a detail attribute from a geometry.
-
Removes an item at the given index from an array.
-
Removes a point from the geometry.
-
Removes a point attribute from a geometry.
-
Removes a point group from a geometry.
-
Removes a primitive from the geometry.
-
Removes a primitive attribute from a geometry.
-
Removes a primitive group from a geometry.
-
Removes an item from an array.
-
Removes a vertex from the geometry.
-
Removes a vertex attribute from a geometry.
-
Removes a vertex group from a geometry.
-
Reorders items in an array or string.
-
Replaces occurrences of a substring.
-
Replaces the matched string pattern with another pattern.
-
Sets the length of an array.
-
Returns an array or string in reverse order.
-
Convert RGB color space to HSV color space.
-
Convert a linear sRGB triplet to CIE XYZ tristimulus values.
-
Rounds the number to the closest whole number.
-
Applies a rotation to the given matrix.
-
Rotates a vector by a rotation that would bring the x-axis to a given direction.
-
Strips trailing whitespace from a string.
-
Samples a BSDF.
-
Samples the Cauchy (Lorentz) distribution.
-
Samples a cumulative distribution function (CDF).
-
Generates a uniform unit vector2, within maxangle of center, given a uniform number between 0 and 1.
-
Generates a uniform unit vector2, given a uniform number between 0 and 1.
-
Generates a uniform vector2 with alpha < length < 1, where 0 < alpha < 1, given a vector2 of uniform numbers between 0 and 1.
-
Generates a uniform vector2 with length < 1, within maxangle of center, given a vector2 of uniform numbers between 0 and 1.
-
Generates a uniform vector2 with length < 1, given a vector2 of uniform numbers between 0 and 1.
-
Generates a uniform unit vector, within maxangle of center, given a vector2 of uniform numbers between 0 and 1.
-
Generates a uniform unit vector, given a vector2 of uniform numbers between 0 and 1.
-
Returns an integer, either uniform or weighted, given a uniform number between 0 and 1.
-
Samples the exponential distribution.
-
Generates a unit vector, optionally biased, within a hemisphere, given a vector2 of uniform numbers between 0 and 1.
-
Generates a uniform vector4 with length < 1, within maxangle of center, given a vector4 of uniform numbers between 0 and 1.
-
Generates a uniform vector4 with length < 1, given a vector4 of uniform numbers between 0 and 1.
-
Samples the log-normal distribution based on parameters of the underlying normal distribution.
-
Samples the log-normal distribution based on median and standard deviation.
-
Samples the normal (Gaussian) distribution.
-
Generates a uniform unit vector4, within maxangle of center, given a vector of uniform numbers between 0 and 1.
-
Generates a uniform unit vector4, given a vector of uniform numbers between 0 and 1.
-
Generates a uniform vector with length < 1, within maxangle of center, given a vector of uniform numbers between 0 and 1.
-
Generates a uniform vector with alpha < length < 1, where 0 < alpha < 1, given a vector of uniform numbers between 0 and 1.
-
Generates a uniform vector with length < 1, given a vector of uniform numbers between 0 and 1.
-
Warps uniform random samples to a disk.
-
Scales the given matrix in three directions simultaneously (X, Y, Z - given by the components of the scale_vector).
-
Returns one of two parameters based on a conditional.
-
Sensor function to render GL scene and query the result.
-
Sensor function query a rendered GL scene.
-
Sensor function to query average values from rendered GL scene.
-
Sensor function query a rendered GL scene.
-
Sensor function to save a rendered GL scene.
-
Flattens an array of vector or matrix types into an array of floats.
-
Creates a new value based on its arguments, such as creating a vector from its components.
-
Overrides the value of an agent primitive’s channel.
-
Overrides the values of an agent primitive’s channels.
-
Sets the current animation clips for an agent primitive.
-
Sets the animation clips that an agent should use to compute its transforms.
-
Sets the current times for an agent primitive’s animation clips.
-
Sets the blend weights for an agent primitive’s animation clips.
-
Sets the collision layer of an agent primitive.
-
Sets the collision layers of an agent primitive.
-
Sets the current layer of an agent primitive.
-
Sets the current display layers of an agent primitive.
-
Overrides the local space transform of an agent primitive’s bone.
-
Overrides the local space transforms of an agent primitive.
-
Overrides the world space transform of an agent primitive’s bone.
-
Overrides the world space transforms of an agent primitive.
-
Writes an attribute value to geometry.
-
Sets the meaning of an attribute in geometry.
-
Sets a single component of a vector or matrix type, or an item in an array.
-
Sets a detail attribute in a geometry.
-
Sets the value of a writeable detail intrinsic attribute.
-
Sets edge group membership in a geometry.
-
Sets the transform of a packed primitive.
-
Sets a point attribute in a geometry.
-
Adds or removes a point to/from a group in a geometry.
-
Sets an array of point local transforms at the given point indices.
-
Sets the world space transform of a given point
-
Sets an array of point transforms at the given point indices.
-
Sets a primitive attribute in a geometry.
-
Adds or removes a primitive to/from a group in a geometry.
-
Sets the value of a writeable primitive intrinsic attribute.
-
Rewires a vertex in the geometry to a different point.
-
Sets a vertex attribute in a geometry.
-
Adds or removes a vertex to/from a group in a geometry.
-
Rewires a vertex in the geometry to a different point.
-
The shadowmap function will treat the shadow map as if the image were rendered from a light source.
-
Bit-shifts an integer left.
-
Bit-shifts an integer right.
-
Bit-shifts an integer right.
-
Returns -1, 0, or 1 depending on the sign of the argument.
-
Returns the sine of the argument.
-
Returns the hyperbolic sine of the argument.
-
Returns the sine of the argument scaled by Pi.
-
Yields processing for a certain number of milliseconds.
-
Quaternion blend between q1 and q2 based on the bias.
-
Spherical blends between two vectors based on the bias.
-
Slices a sub-string or sub-array of a string or array.
-
Finds the normal component of frame slid along a curve.
-
Computes ease in/out interpolation between values.
-
Returns the closest equivalent Euler rotations to a reference rotation.
-
These functions are similar to wnoise.
-
Computes the solid angle (in steradians) a BSDF function subtends.
-
Applies an inverse kinematics algorithm to a skeleton.
-
Solves a cubic function returning the number of real roots.
-
Applies a curve inverse kinematics algorithm to a skeleton.
-
Applies a full-body inverse kinematics algorithm to a skeleton.
-
Applies an inverse kinematics algorithm to a skeleton.
-
Applies a full-body inverse kinematics algorithm to a skeleton, with optional control over the center of mass.
-
Finds the real roots of a polynomial.
-
Solves a quadratic function returning the number of real roots.
-
Finds the angles of a triangle from its sides.
-
Returns the array sorted in increasing order.
-
Returns a specular BSDF or computes specular shading.
-
Returns the computed BRDFs for the different lighting models used in VEX shading.
-
Samples a value along a polyline or spline curve.
-
Generate a cumulative distribution function (CDF) by sampling a spline curve.
-
Splits a string into tokens.
-
Splits a bsdf into its component lobes.
-
Splits a file path into the directory and name parts.
-
Formats a string like printf but returns the result as a string instead of printing it.
-
Returns the square root of the argument.
-
Creates an approximate SSS BSDF.
-
Returns 1 if the string starts with the specified string.
-
Strips leading and trailing whitespace from a string.
-
Returns the length of the string.
-
Returns the sum of a list of numbers.
-
Finds the distance of a point to a group of points along the surface of a geometry.
-
Computes the singular value decomposition of a given matrix.
-
Use a different bsdf for direct or indirect lighting.
-
Rearranges the components of a vector.
-
Returns the trigonometric tangent of the argument
-
Returns the hyperbolic tangent of the argument
-
Returns the trigonometric tangent of the argument scaled by Pi
-
Returns primitive number of an adjacent tetrahedron.
-
Returns vertex indices of each face of a tetrahedron.
-
Imports attributes from texture files.
-
Similar to sprintf, but does expansion of UDIM or UVTILE texture filename expansion.
-
Computes a filtered sample of the texture map specified.
-
Returns the value of the 3d image at the position specified by P.
-
This function queries the 3D texture map specified and returns the bounding box information of the file.
-
Returns a string that is the titlecase version of the input string.
-
Transforms a position into normal device coordinates.
-
Converts all characters in string to lower case
-
Converts all characters in string to upper case
-
Returns the trace of the given matrix.
-
Translates a matrix by a vector.
-
Returns a Lambertian translucence BSDF.
-
Transposes the given matrix.
-
Removes the fractional part of a floating point number.
-
Transforms a normal vector from Texture to World space.
-
Transforms a position value from Texture to World space.
-
Transforms a direction vector from Texture to World space.
-
Returns a numeric code identifying a VEX data type.
-
Returns one of the set of unique values across all values for an int or string attribute.
-
Returns the set of unique values across all values for an int or string attribute.
-
Reverses the packing of pack_inttosafefloat to get back the original integer.
-
Turns a flat array of floats into an array of vectors or matrices.
-
Adds a uniform item to an array.
-
Creates an attribute of a given type on a primitive.
-
Excludes an object from the collection
-
Includes an object in the collection
-
usd_addinversetotransformorder
Appends an inversed transform operation to the primitive’s transform order
-
Applies a quaternion orientation to the primitive
-
Creates a primitive of a given type.
-
Creates a primvar of a given type on a primitive.
-
Adds a target to the primitive’s relationship
-
Applies a rotation to the primitive
-
Applies a scale to the primitive
-
Creates an attribute of a given type on a primitive, and sets the custom metadata flag to False.
-
Appends a transform operation to the primitive’s transform order
-
Applies a transformation to the primitive
-
Applies a translation to the primitive
-
Apply an API schema to a primitive.
-
Reads the value of an attribute from the USD primitive.
-
Reads the value of an element from an array attribute.
-
Returns the length of the array attribute.
-
Returns the names of the attributes available on the primitive.
-
Returns the tuple size of the attribute.
-
Returns the time codes at which the attribute values are authored.
-
Returns the name of the attribute type.
-
Blocks the attribute.
-
Blocks the primvar.
-
Blocks the primvar.
-
Blocks the primitive’s relationship
-
Returns the material path bound to a given primitive.
-
Returns the names of the primitive’s children.
-
Clears the value of the metadata.
-
Clears the primitive’s transform order
-
Obtains the list of all objects that belong to the collection
-
Checks if an object path belongs to the collection
-
Obtains the object paths that are in the collection’s exclude list
-
Obtains the collection’s expansion rule
-
Obtains the object paths that are in the collection’s include list
-
Returns the primitive’s draw mode.
-
Retrurns primitive’s transform operation full name for given the transform operation suffix
-
Reads the value of a flattened primvar directly from the USD primitive or from USD primitive’s ancestor.
-
Reads an element value of a flattened array primvar directly from the USD primitive or from its ancestor.
-
Reads the value of an flattened primvar directly from the USD primitive.
-
Reads an element value of a flattened array primvar directly from a USD primitive.
-
Sets two vectors to the minimum and maximum corners of the bounding box for the primitive.
-
Returns the center of the bounding box for the primitive.
-
Returns the maximum of the bounding box for the primitive.
-
Returns the minimum of the bounding box for the primitive.
-
Returns the size of the bounding box for the primitive.
-
Obtains the primitive’s bounds
-
Obtains the primitive’s bounds
-
Checks if the primitive adheres to the given API.
-
Checks if the primitive adheres to the given API.
-
Reads the value of a primvar directly from the USD primitive or from USD primitive’s ancestor.
-
Reads the value of an element from the array primvar directly from the USD primitive or from USD primitive’s ancestor.
-
Returns the element size of the primvar directly from the USD primitive or from USD primitive’s ancestor.
-
Returns the index array of an indexed primvar directly on the USD primitive or on USD primitive’s ancestor.
-
Returns the element size of the primvar directly on the USD primitive or on USD primitive’s ancestor.
-
Returns the length of the array primvar directly on the USD primitive or on USD primitive’s ancestor.
-
Returns the names of the primvars available directly on the given USD primitive or on USD primitive’s ancestor.
-
Returns the tuple size of the primvar directly on the USD primitive or on USD primitive’s ancestor.
-
Returns the time codes at which the primvar values are authored directly on the given primitive or on its ancestor.
-
Returns the name of the primvar type found on the given primitive or its ancestor.
-
Checks if the primitive is abstract.
-
Checks if the primitive is active.
-
Checks if the attribute is an array.
-
Checks if there is an array primvar directly on the USD primitive or on USD primitive’s ancestor.
-
Checks if the given metadata is an array.
-
Checks if there is an array primvar directly on the USD primitive.
-
Checks if the primitive has an attribute by the given name.
-
Checks if the collection exists.
-
Checks if the path is a valid collection path.
-
Checks if there is an indexed primvar directly on the USD primitive or on USD primitive’s ancestor.
-
Checks if there is an indexed primvar directly on the USD primitive.
-
Checks if the primitive is an instance.
-
Checks if the primitive or its ancestor has a primvar of the given name.
-
Checks if the primitive is of a given kind.
-
Checks if the primitive has metadata by the given name.
-
Checks if the primitive is a model.
-
Checks if the path refers to a valid primitive.
-
Checks if the primitive has a primvar of the given name.
-
Checks if the primitive has a relationship by the given name.
-
Checks if the stage is valid.
-
Checks if the primitive transform is reset
-
Checks if the primitive is of a given type.
-
Checks if the primitive is visible.
-
Returns the primitive’s kind.
-
Obtains the primitive’s local transform
-
Constructs an attribute path from a primitive path and an attribute name.
-
Constructs a collection path from a primitive path and a collection name.
-
Constructs an property path from a primitive path and an property name.
-
Constructs an relationship path from a primitive path and a relationship name.
-
Forces a string to conform to the rules for naming USD primitives.
-
Forces a string to conform to the rules for paths to USD primitives.
-
Reads the value of metadata from the USD object.
-
Reads the value of an element from the array metadata.
-
Returns the length of the array metadata.
-
Returns the names of the metadata available on the object.
-
Returns the name of the primitive.
-
Returns the path of the primitive’s parent.
-
Sets two vectors to the minimum and maximum corners of the bounding box for the given instance inside point instancer.
-
usd_pointinstance_getbbox_center
Returns the center of the bounding box for the instance inside a point instancer primitive.
-
Returns the maximum position of the bounding box for the instance inside a point instancer primitive.
-
Returns the minimum position of the bounding box for the instance inside a point instancer primitive.
-
usd_pointinstance_getbbox_size
Returns the size of the bounding box for the instance inside a point instancer primitive.
-
Returns the relative position of the point given with respect to the bounding box of the geometry.
-
Obtains the transform for the given point instance
-
Reads the value of a primvar directly from the USD primitive.
-
Returns the namespaced attribute name for the given primvar.
-
Reads the value of an element from the array primvar directly from the USD primitive.
-
Returns the element size of the primvar directly from the USD primitive.
-
Returns the index array of an indexed primvar directly on the USD primitive.
-
Returns the element size of the primvar directly on the USD primitive.
-
Returns the length of the array primvar directly on the USD primitive.
-
Returns the names of the primvars available on the given USD primitive.
-
Returns the tuple size of the primvar directly on the USD primitive.
-
Returns the time codes at which the primvar values are authored directly on the given primitive.
-
Returns the name of the primvar type found on the given primitive.
-
Returns the primitive’s purpose.
-
usd_relationshipforwardedtargets
Obtains the relationship forwarded targets.
-
Returns the names of the relationships available on the primitive.
-
Obtains the relationship targets.
-
Returns the relative position of the point given with respect to the bounding box of the geometry.
-
Remove a target from the primitive’s relationship
-
Sets the primitive active state.
-
Sets the value of an attribute.
-
Sets the value of an element in an array attribute.
-
Sets the excludes list on the collection
-
usd_setcollectionexpansionrule
Sets the expansion rule on the collection
-
Sets the includes list on the collection
-
Sets the primitive’s draw mode.
-
Sets the primitive’s kind.
-
Sets the value of an metadata.
-
Sets the value of an element in an array metadata.
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Sets the value of a primvar.
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Sets the value of an element in an array primvar.
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Sets the element size of a primvar.
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Sets the indices for the given primvar.
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Sets the interpolation of a primvar.
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Sets the primitive’s purpose.
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Sets the targets in the primitive’s relationship
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Sets the primitive’s transform order
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Sets/clears the primitive’s transform reset flag
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Sets the selected variant in the given variant set.
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Configures the primitive to be visible, invisible, or to inherit visibility from the parent.
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Makes the primitive visible or invisible.
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Returns the primitive’s specifier.
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Constructs a full name of a transform operation
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Obtains the primitive’s transform order
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Extracts the transform operation suffix from the full name
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Infers the transform operation type from the full name
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Returns the name of the primitive’s type.
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Constructs a unique full name of a transform operation
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Returns the variants belonging to the given variant set on a primitive.
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Returns the currently selected variant in a given variant set.
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Returns the variant sets available on a primitive.
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Obtains the primitive’s world transform
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Finds the distance of a uv coordinate to a geometry in uv space.
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This function computes the intersection of the specified ray with the geometry in uv space.
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Interpolates the value of an attribute at certain UV coordinates using a UV attribute.
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Computes the position and normal at given (u, v) coordinates, for use in a lens shader.
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Computes the mean value and variance for a value.
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Reads a vertex attribute value from a geometry.
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Reads a vertex attribute value from a geometry.
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Returns the size of a geometry vertex attribute.
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Returns the type of a geometry vertex attribute.
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Returns the type info of a geometry attribute.
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Returns the parametric coordinate of a vertex along the perimeter of its primitive.
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Returns the half-edge which has a vertex as source.
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Converts a primitive/vertex pair into a linear vertex.
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Returns the linear vertex number of the next vertex sharing a point with a given vertex.
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Returns the point number of linear vertex in a geometry.
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Returns the linear vertex number of the previous vertex sharing a point with a given vertex.
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Returns the number of the primitive containing a given vertex.
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Converts a linear vertex index into a primitive vertex number.
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Generates Voronoi (cellular) noise.
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Returns the volume of the microvoxel containing a variable such as P.
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Samples the volume primitive’s value.
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Samples the volume primitive’s value.
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Calculates the volume primitive’s gradient.
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Gets the value of a specific voxel.
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Gets the active setting of a specific voxel.
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Gets the integer value of a specific voxel.
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Gets the index of the bottom left of a volume primitive.
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Gets the vector4 value of a specific voxel.
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Converts a volume voxel index into a position.
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Gets the vector2 value of a specific voxel.
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Gets the vector value of a specific voxel.
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Converts a position into a volume voxel index.
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Gets the resolution of a volume primitive.
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Samples the volume primitive’s float value.
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Samples the volume primitive’s integer value.
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Samples the volume primitive’s vector4 value.
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Samples the volume primitive’s vector2 value.
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Samples the volume primitive’s vector value.
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Samples the volume primitive’s value.
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Samples the volume primitive’s value.
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Gets the typeid of the data of a volume or VDB primitive.
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Computes the approximate diameter of a voxel.
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Transforms a directional vector.
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Reports a custom runtime VEX warning.
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Blends an existing name/weight array pair with another array or named item.
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Initializes an index array and weight array pair with a single named entry.
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Normalizes an array of floats so it sums to 1.0.
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Discards any weights below a threshold from an name/weight array pair.
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Computes the winding number of a mesh around a point. Winding number indicates how many times a geometry wraps around a point. Useful for inside/outside test, the winding number is equal to one inside of the mesh and zero outside.
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Computes the winding number of a curve in XY plane around a point. Winding number indicates how many times a curve wraps around a point. Useful for inside/outside test, the winding number is equal to one inside of the curve and zero outside.
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Generates Worley (cellular) noise.
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Transforms a normal vector from World to Object space.
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Transforms a position value from World to Object space.
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Transforms a direction vector from World to Object space.
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Transforms a normal vector from World to Texture space.
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Transforms a position value from World to Texture space.
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Transforms a direction vector from World to Texture space.
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Simplex noise is very close to Perlin noise, except with the samples on a simplex mesh rather than a grid. This results in less grid artifacts. It also uses a higher order bspline to provide better derivatives.
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Derivatives of Simplex Noise.
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Finds the distance from a point to the closest location on surface geometry.
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Convert CIE XYZ tristimulus values to a linear sRGB triplet.