Houdini 19.0 Nodes Render nodes

Labs Vertex Animation Textures 2.0 render node

The Vertex Animation Textures ROP will export a mesh and textures to be used with a realtime material that can playback complex animations for cloth, rigid body destruction, fluids and particles.

Vertex Animation Textures are an alternative method for playing back complex simulations in your game engine. The advantage to these textures is that they are read from the GPU making them ideal candidates for playing back complex animation. The downside is in order for the results to be accurate, these textures need to be uncompressed which can take up signifcant memory.

Parameters

User Interface

Simple (Default) shows a limited UI of the parameters that would be changed the most often. Normal is a fully expanded UI with more in-depth but less used controls.

Start/End

This is the begining and end frame of the export. Please account for the one frame offset of the start frame to the end frame. By default the exporter will break the dynamic variables on creation.

Render With Take

If you are using takes you can change the exporter options.

Method

What primary method to export for:

Soft - Consistant Topology throughout the Simulation.

Rigid - Packed Primitive style Rigid Body Simulation.

Fluid - Changing Topology throughout the Simulation.

Sprite - Camera facing cards, points moving through space.

Engine

Set the scale, texture type and coordinate system specific to the game engine chosen.

Initialize for Engine

Applies the preset option for each engine. Make sure to do this as soon as possible as the result will overwrite parameters in the UI.

SOP Path

The path to your geometry in sops.

Data For Realtime Material

Note

Any value that needs to be copied to your game-engine material has a copy button next to it.

Frame Range

The number of calculated frames. Your last frame minus your start frame. This value will be set by a script when you click Render.

Speed

The rate in houdini of your frames per second divided by your frame range. In your engine this may vary if your frame rate is different or varying. This value will be set by a script when you click Render.

Position Min/Max

Copy these values to the material in your game-engine to expand normalised position values back to their original range.

Pivot Min/Max

Visible when the Rigid method has been chosen. Pivot values are stored in the vertex colour. Most game engines will clamp these values between 0 and 1. Copy these values to the material in your game-engine to expand normalised pivot values back to their original range.

Scale Max/Min

Visible when the Rigid method has been chosen. Remaps the max and min scale over the course of the entire time range.

Width/Height

Visible when the Sprite method has been chosen and the Engine is set to Unity. Set width and height from houdini for your sprite scale.

Active Pixels

When Pad to Power of 2 is activated these values represent the pixel dimensions of the original texture. These value will be set by a script when you click Render.

Padded Size

When Pad to Power of 2 is activated this is the smallest power of 2 value for each axis. The material will use these numbers to calculate a ratio for the uv lookup. These value will be set by a script when you click Render.

Normalize data range to 0-1 space

If you intend to use texture compression then normalized data is required for your texture maps.

Pack normals into Position Alpha

Stores the normal data in the alpha channel of the position map to save texture space. This method will result in less accurate normals.

Pack Pscale into Position Alpha

Stores the pscale data into the alpha channel of the position map to save texture space.

Pad to Power of 2

When activated all textures will be exported to the nearest power of 2 value in each axis. Power of two textures allows for texture streaming on the GPU.

Double Textures (Higher Precision)

If your engine is limited to 8bit textures, a second texture can be used for higher precision.

Target Texture Size

This is the maximum width of your texture. The height is dictated by the number of frames of your animation and the number of vertices relative to your maximum width.

Target Prim Count

This is the maximum number of triangles that will be used for your fluid export mesh. Ideally this number should be less than the triangle count of the input mesh.

Calculate Optimal Primcount

This will set the target prim count value to the total number of triangles on the current frame of the input mesh.

Paths

enable_project

Enable asset name override.

Project

Your parent project directory, by default this is the $JOB for those studios that use it.

Component Enable

This allows you to override the Asset name in the file path. This is typically 'opname(“..”)', the parent node of this sop area. This allows you to copy and paste this render object or unique asset as many times as you need. If within a subnet this will reflect the subnet name.

Component

By default this will refer to the name of the parent object, or subnet of this node, so you can perform a lot of copy and paste name space tricks to duplicate assets. If you need you can override the Asset name and enter any string or expression you need in there.

enable_geo

Enable export of geometry.

Geometry

Path on disk to save the geometry.

Browse Path

Opens an explorer window to the listed directory

enable_pos

Enable export of position.

Position

Path on disk to save the position map.

Position2

If Double Textures is enabled, the path on disk to save the second position map.

enable_rot

Enable export of rotation.

Rotation

Path on disk to save the rotation map.

enable_scale

Enable export of scale.

Scale

Allow your exported mesh to have pre-scale to the mesh, besides defaulting at origin.

enable_normal

If disabled Normal is packed into Alpha. Enable export of normal map.

Normal

Path on disk to save normal map, when not using the packed normals in the alpha of the position map.

Export Color Map

Enable export of color.

Color

Path on disk to save the color map.

Update Mat

Enable export of material instance for engines that support it, and this will update the values in the material instances for engines that allow it.

Material

The copy and paste material code for the engine.

Create Data

Enable export of data for the realtime shader to a json library so you can source control it.

Realtime Data

Path on disk to save the data for the real time shader.

Create Shader

Enable creation of the shader for engine that allow it.

Shader Path

Path on disk to save the shader.

Settings

Initialize Simulation OPs

Triggers all simulation contexts to run in the cook chain prior to export.

Equalize Edges

For fluid exports. This will even the edges of the triangles for the best compression.

Reverse Normals

Reverses the normals on the mesh. Helpful for one sided meshes like sprites.

Convert to Image Format’s Colorspace

This removes any sRGB lookup that are default for the formats.

Raster Depth

This will be set when Initialize for Engine is clicked. Adjust the bitdepth for the image to be exported.

Black/White Points

The min and max pixels values for the exported image. This does not remap the textures to fit.

BC 4Channel Split

Renders the channels separately for different data formats.

Position Coord

This will be set when Initialize for Engine is clicked. Re-order the components for different coordinate systems.

Color Coord

Re-order the components for different coordinate systems. For color this maybe be helpful if you are hijacking this map for other purposes besides color.

Name

The name of the geometry object to be exported as, as opposed to being called MESH.1

Position

Translate

Allow your exported mesh to have pre-transform to the mesh, besides defaulting at origin.

Rotate

Allow your exported mesh to have pre-rotation to the mesh, besides defaulting at origin.

Pivot

Allow your exported mesh to have pre-pivot to the mesh, besides defaulting at origin.

Delta (P.xyz)

The expected position attribute coming into the exporter.

Normal (N.xyz)

The expected normal attribute coming into the exporter.

Rest (rest.xyz)

The expected rest attribute coming into the exporter.

Rotation (orient.abcd)

The expected rotation attribute coming into the exporter.

scale (scale.xyz)

The expected scale attribute going to the engine.

pscale (pscale.x)

The expected point scale attribute coming into the exporter.

Pivot (pivot.xyz)

The expected pivot attribute coming into the exporter.

Color (Cd.xyz)

The expected color attribute coming into the exporter.

Alpha (Alpha.xyz)

The expected alpha attribute coming into the exporter.

Delta (P)

The expected position attribute going to the engine.

Normal (N)

The expected normal attribute going to the engine.

uv (uv.xy)

The expected uv attribute going to the engine.

Tiling Coord (uv2.xy)

The expected uv2 attribute going to the engine.

uv3 (uv3.xy)

The expected values going to the engine.

pscale (P.w)

The expected point scale attribute going to the engine.

Pivot (Cd.xyz)

The expected pivot attribute going to the engine.

Color (Cd.rgb)

The expected color attribute going to the engine.

Alpha (Cd.a)

The expected alpha attribute going to the engine.

Sample Shader Code

Note

For Unreal Engine: Use the copy button to copy code that can be pasted into a material function. This will not work correctly if pasted into a material.

Note

For Unity: Shader files are automatically created in your project path if the Shader Path option has been enabled.

Scripts

Pre-Render

Run this code before any rendering.

Post-Render

Run this code after all rendering.

Render nodes

  • Agent

    This output operator is used to write agent definition files.

  • Alembic

    Exports the scene to an Alembic archive. Alembic is a common exchange format for moving geometry and animation between different 3D software packages.

  • Archive Generator

    Generates disk-based archives which can be used by either mantra or RIB renderers.

  • Bake Animation

    Bakes animation from object transforms and CHOP overrides.

  • Bake Texture

    Generates a texture map from one or more objects' rendered appearance.

  • Batch

    Renders the input ROP in a single batch job.

  • Brick Map Generator

    Allows you to convert Houdini volume primitives into Pixar brickmap files.

  • Channel

    The Channel output operator generates clip files from a particular CHOP.

  • Composite

    The Composite output operator renders the image(s) produced in the Compositing Editor.

  • DSM Merge

    Merges two or more deep shadow/camera map files.

  • Dynamics

    Saves the state of a DOP network simulation into files.

  • Fetch

    Makes a dependency link to a ROP in a different network.

  • Filmbox FBX

    Exports entire scenes to FBX files.

  • Filmbox FBX Animation

    Export animation from geometry-based skeleton to an FBX file.

  • Filmbox FBX Character

    Export a skinned character with geometry-based skeleton to an FBX file.

  • Frame Container

    Prevents frame dependency changes in the contained nodes from affecting its inputs.

  • Frame Depedency

    Allows an output frame to depend on one or more input frames.

  • GLTF Character

  • Geometry

    Generates geometry files from a SOP or DOP network.

  • HQueue Render

    HQueue, or Houdini Queue, is a distributed job scheduling system.

  • HQueue Simulation

    HQueue, or Houdini Queue, is a distributed job scheduling system.

  • Hair Card Texture

    Renders hair textures for use on hair cards.

  • Karma

    Renders non-USD scenes using Houdini’s Karma renderer.

  • Labs 3D Facebook Image

    Quickly render a 3D scene to a 2.5D image that can be uploaded to Facebook.

  • Labs Marmoset ROP

    The Marmoset ROP allows you to quickly generate an mview inside Houdini

  • Labs Motion Vectors

    Convert volume or point velocities to texture space motion vectors for a sequence.

  • Labs Niagara ROP

    Export point caches to be used with Unreal’s Niagara particle system.

  • Labs Sketchfab

    Uploads geometry to Sketchfab

  • Labs Texture Sheets

    Render an image sequence and assemble it as a single sheet (subUv, flipbook)

  • Labs Vertex Animation Textures

    The Vertex Animation Textures ROP will export a mesh and textures to be used with a realtime material that can playback complex animations for cloth, rigid body destruction, fluids and particles.

  • Labs Vertex Animation Textures

    The Vertex Animation Textures ROP will export a mesh and textures to be used with a realtime material that can playback complex animations for cloth, rigid body destruction, fluids and particles.

  • Labs Vertex Animation Textures

    The Vertex Animation Textures ROP will export a mesh and a set of textures to be used with a shader for complex real-time effects, such as: soft-body deformation, rigid-body dynamics, dynamically remeshed geometries, and particle sprites.

  • MDD Point Cache

    This output operator is used to write an MDD animation file.

  • Mantra

    Renders the scene using Houdini’s standard mantra renderer and generates IFD files.

  • Mantra Archive

    Generates disk-based archives which can be used by mantra.

  • Merge

    Merges several render dependencies into one.

  • Net Barrier

    Blocks the ROP network until synchronization occurs.

  • Null

    Does nothing.

  • OpenGL

    Render an image using the hardware-accelerated 3D viewport renderer.

  • Pre Post

    Renders ROPs before and after a main job.

  • Render nodes

    Render nodes either render the scene or set up render dependency networks.

  • Shell

    Runs an external command.

  • Subnetwork

    The SubNetwork output operator provides an easy way to manage large number of output operators.

  • Switch

    Renders one of several inputs.

  • Tractor

    Tractor is a program shipped out with Pixar’s distribution of RenderMan.

  • USD

    Renders a LOP network out to one or more USD files. This node is available as render node or as a LOP.

  • USD Render

    Renders an output image from the stage generated by a LOP network.

  • USD Stitch

    Merges USD files representing individual frames by composing them.

  • USD Stitch Clips

    Merges multiple value clips representing individual frames.

  • USD Zip

    Assembles USDZ archive files from existing USD files.

  • Wedge

    Re-renders the same ROP multiple times with different settings

  • Wren

    This output operator is used to drive the Wren rendering program.

  • glTF

  • glTF