Houdini 19.0 Nodes Render nodes

Labs Motion Vectors render node

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

The Motion Vector ROP can be used to generate a texture for time warping texture sheets in your game engine. It requires a vel field for volumes or the point attribute v to create the texture space vectors. Attempting to create motion vectors for low density volumes can sometimes create innacurate results. Using an external package to generate optical flow maps is recommended in that case.

Tutorial Page

Parameters

Start/End

Start and End frame of the render sequence.

Export Node

Node to export. Make sure you select the object level node.

Camera

Render Camera.

Output Picture

Path to render sequence.

Motion Vector Map

Path to motion vector image.

Images per Line

Number of images, side-by-side, on the horizontal axis.

Atlas Resolution

Final resolution of the motion vector image. This is not the same as the resolution for each frame in the render sequence.

No. Of Frames

Total number of frames from start to finish

Atlas Layout

How the images are layed out in the texture sheet.

Resolution per Frame

The resolution for each frame based on the atlas resolution and images per line.

Raw Multiplier

The exported image has normalised values. Sometimes the movement per pixel is greater than 1. This multiplier captures that difference. Copy and paste this value into the raw multiplier input of the material function in UE4.

Material Function Code

Copy and paste this code into a material function in UE4.

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