Houdini 20.5 Nodes Object nodes

Guide Groom object node

Generates guide curves from a skin geometry and does further processing on these using an editable SOP network contained within the node.

Since 16.0

Note

The skin geometry is expected to be static. Use Guide Deform to move curves with an animated skin.

Parameters

Groom Source

Source Mode

No Input Groom:

Groom Object:

Groom File:

Groom Object:

Groom File:

Rest Skin Source

Skin Source

SOP Geometry

Fetch the skin geometry from an Object or SOP node.

File

Load the skin geometry from a file.

Skin SOP

Fetch the skin geometry from this SOP.

Skin File

Load the skin geometry from this file.

Group

Generate guide curves on this group of primitives.

Skin VDB

Options for generating or loading a VDB representation of the skin geometry. Many of the tools typically used within the Guide Groom object rely on this VDB volume to efficiently avoid skin penetration.

VDB Source

From Skin Geometry

Generate the VDB from the specified skin geometry.

SOP Geometry

Merge the VDB from a SOP.

File

Load the VDB from a file.

Parameters for From Skin Geometry:

Voxel Size

Generate a VDB Volume of the skin geometry using this voxel size.

The volume is used by SOP nodes to push curves out of the skin geometry.

Parameters for SOP Geometry mode:

SOP Path

Merge the skin VDB from this SOP Path.

Group

The group within the SOP geometry to use.

Parameters for File mode:

File

Load the skin VDB from this file path.

Group

The group within the file to use.

Tip

If the SOP or file contains multiple volumes, use @name==surface to fetch the surface VDB only, since this is the only volume used by the grooming tools.

Basic

Guide Creation

Mode

Scatter On Surface

Scatter guide curves on the skin geometry.

Guide Per Point

Generate a guide curve at each point of the skin geometry.

Use External Geometry

Fetch guides from an external geometry.

Density

Scatter guides at this density.

This parameter can be overridden using an attribute or texture. To do this, select an option from the drop-down menu next to the parameter.

Scatter Seed

Scatter guides using this seed value.

Relax Iterations

Number of times to relax guide locations after scattering. Higher iterations result in a more even distribution of guides at the cost of more computation time.

Geometry

Fetch guide curves from this SOP node.

Resample To Match Fur Segments

Resample guides to the segment count used by this node.

Reverse Curves

Reverse incoming curves. Houdini expects the first vertex of curves to be the root of the curve. Use this option if the first vertex of your guides is at the tip.

Snap To Skin

Move guide curves to the skin surface. Use this to fix guides that are slightly offset from the skin.

Guide Properties

Initial Direction Attrib:

Segments

Generate guide curves with this segment count.

Length

Generate guide curves with this initial length.

This parameter can be overridden using an attribute or texture. To do this, select an option from the drop-down menu next to the parameter.

Display

Display As Subdivision Curves

Subdivide curves in the viewport for a smooth appearance.

Display Color

Display curves in this color in the viewport.

Optimization

Bypass Editable SOP Network

Skip cooking of the editable network inside this node. This is useful to get faster feedback while adjusting parameters on this node.

Skin Attribute Transfer

Transfer skin attributes of all types to primitive attributes on the generated curves.

Point Attributes

Transfer these point attributes from the skin.

Vertex Attributes

Transfer these vertex attributes from the skin.

Primitive Attributes

Transfer these primitive attributes from the skin.

Detail Attributes

Transfer these detail attributes from the skin.

File Cache

See the File Cache SOP help for these parameters.

See also

Object nodes

  • Agent Cam

    Create and attach camera to a crowd agent.

  • Alembic Archive

    Loads the objects from an Alembic scene archive (.abc) file into the object level.

  • Alembic Xform

    Loads only the transform from an object or objects in an Alembic scene archive (.abc).

  • Ambient Light

    Adds a constant level of light to every surface in the scene (or in the light’s mask), coming from no specific direction.

  • Auto Bone Chain Interface

    The Auto Bone Chain Interface is created by the IK from Objects and IK from Bones tools on the Rigging shelf.

  • Blend

    Switches or blends between the transformations of several input objects.

  • Blend Sticky

    Computes its transform by blending between the transforms of two or more sticky objects, allowing you to blend a position across a polygonal surface.

  • Bone

    The Bone Object is used to create hierarchies of limb-like objects that form part of a hierarchy …

  • Camera

    You can view your scene through a camera, and render from its point of view.

  • Common object parameters

  • Dop Network

    The DOP Network Object contains a dynamic simulation.

  • Environment Light

    Environment Lights provide background illumination from outside the scene.

  • Extract Transform

    The Extract Transform Object gets its transform by comparing the points of two pieces of geometry.

  • Fetch

    The Fetch Object gets its transform by copying the transform of another object.

  • Formation Crowd Example

    Crowd example showing a changing formation setup

  • Fuzzy Logic Obstacle Avoidance Example

  • Fuzzy Logic State Transition Example

  • Geometry

    Container for the geometry operators (SOPs) that define a modeled object.

  • Groom Merge

    Merges groom data from multiple objects into one.

  • Guide Deform

    Moves the curves of a groom with animated skin.

  • Guide Groom

    Generates guide curves from a skin geometry and does further processing on these using an editable SOP network contained within the node.

  • Guide Simulate

    Runs a physics simulation on the input guides.

  • Hair Card Generate

    Converts dense hair curves to a polygon card, keeping the style and shape of the groom.

  • Hair Card Texture Example

    An example of how to create a texture for hair cards.

  • Hair Generate

    Generates hair from a skin geometry and guide curves.

  • Handle

    The Handle Object is an IK tool for manipulating bones.

  • Indirect Light

    Indirect lights produce illumination that has reflected from other objects in the scene.

  • Instance

    Instance Objects can instance other geometry, light, or even subnetworks of objects.

  • LOP Import

    Imports transform data from a USD primitive in a LOP node.

  • LOP Import Camera

    Imports a USD camera primitive from a LOP node.

  • Labs Fire Presets

    Quickly generate and render fire simulations using presets for size varying from torch to small to 1m high and low

  • Light

    Light Objects cast light on other objects in a scene.

  • Light template

    A very limited light object without any built-in render properties. Use this only if you want to build completely custom light with your choice of properties.

  • Microphone

    The Microphone object specifies a listening point for the SpatialAudio CHOP.

  • Mocap Acclaim

    Import Acclaim motion capture.

  • Mocap Biped 1

    A male character with motion captured animations.

  • Mocap Biped 2

    A male character with motion captured animations.

  • Mocap Biped 3

    A male character with motion captured animations.

  • Null

    Serves as a place-holder in the scene, usually for parenting. this object does not render.

  • Path

    The Path object creates an oriented curve (path)

  • PathCV

    The PathCV object creates control vertices used by the Path object.

  • Python Script

    The Python Script object is a container for the geometry operators (SOPs) that define a modeled object.

  • Ragdoll Run Example

    Crowd example showing a simple ragdoll setup.

  • Reference Image

    Container for the Compositing operators (COP2) that define a picture.

  • Rivet

    Creates a rivet on an objects surface, usually for parenting.

  • Simple Biped

    A simple and efficient animation rig with full controls.

  • Simple Female

    A simple and efficient female character animation rig with full controls.

  • Simple Male

    A simple and efficient male character animation rig with full controls.

  • Sound

    The Sound object defines a sound emission point for the Spatial Audio chop.

  • Stadium Crowds Example

    Crowd example showing a stadium setup

  • Stereo Camera Rig

    Provides parameters to manipulate the interaxial lens distance as well as the zero parallax setting plane in the scene.

  • Stereo Camera Template

    Serves as a basis for constructing a more functional stereo camera rig as a digital asset.

  • Sticky

    Creates a sticky object based on the UV’s of a surface, usually for parenting.

  • Street Crowd Example

    Crowd example showing a street setup with two agent groups

  • Subnet

    Container for objects.

  • Switcher

    Acts as a camera but switches between the views from other cameras.

  • TOP Network

    The TOP Network operator contains object-level nodes for running tasks.

  • VR Camera

    Camera supporting VR image rendering.

  • Viewport Isolator

    A Python Script HDA providing per viewport isolation controls from selection.

  • glTF