Houdini 18.0 Nodes Render nodes

USD Stitch render node

Merges USD files representing individual frames by composing them.

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Overview

This node merges multiple USD files together (usually a sequence each containing a single frame of animated data) through stitching.

Stitching combines two files, a stronger and a weaker file. The prims of the weaker file are merged into the prims of the stronger file. If the stronger prim already has an opinion about a prim or attribute, the weaker data is ignored. If the weaker layer contains prims or attributes that don’t exist in the stronger layer, the data from the weaker layer is copied into the stronger layer. If the weaker layer has new time samples for an attribute that exists in the stronger layer (but for a timecode that does not exist in the stronger layer) that time sample from the weaker layer is copied into the stronger layer.

The result of stitching together two layers is a modified version of the stronger layer. Stitching a sequence of files together involves starting with the first layer as the strongest layer, then stitching in the other layers, one at a time, each time producing a new modified version of the strongest layer with (generally) some extra data or time samples copied from each weaker layer in the sequence.

Tips

  • This ROP is very similar to the usdstitch script that comes with USD, except it can stitch many sequences of layers together in a single operation.

Parameters

Render

Click to generate the output files.

Start/End/Inc

Controls the frame number values that are used to determine the sequence of USD files that should be stitched together. No data is generated from nodes in the hip file when executing this ROP, so the frame numbers are only used to generate per-frame file names that are stitched together.

Stitch Files

The number of files sequences that this node will stitch together.

Enable

Enables or disables the stitching of a single file sequence.

Input File

File path to a USD file to stitch. This file path should the frame number, for example dance_$F.usd, so that at each frame a different USD file gets stitched in with the others in the sequence.

There is no harm (or value) in stitching the same file into a sequence twice, other than the wasted computation time. Once a file has been stitched into the sequence, by the definition of the stitching operation, stitching it in again will have no effect.

Output File

File path to write the fully composed USD output file to. This parameter is only evaluated once, at the start of the sequence.

Render nodes

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  • Alembic

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  • Bake Texture

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  • 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.

  • 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.

  • 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 the USD scene using Houdini’s Karma renderer (Beta).

  • 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.

  • RenderMan

    Renders the scene using Pixar’s RenderMan renderer.

  • RenderMan

    Renders the scene using Pixar’s RenderMan RIS renderer.

  • RenderMan Archive

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

  • 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