Houdini 17.0 Nodes Render nodes

Dynamics render node

Saves the state of a DOP network simulation into files.

The Dynamics output driver generates simulation state (.sim) files from a dynamics (DOP) network. Each file contains the complete state of the simulation for a certain frame. You can then read the state back into the network using a File DOP. You can also directly point to a sequence of these files in the Files to Play parameter of the Dopnet Object or Dopnet SOP.

Saved state files are a persistent cache of a simulation. You can move these files around to run the simulation in one place and use the results in another. For example, you can use the hscript standalone utility to run a simulation on a renderfarm and save out state files, then play the simulation back locally by loading the state files with a File DOP. This would let you run multiple versions of a simulation on the renderfarm overnight and compare the results the next day.

Parameters

Save to Disk

Saves the simulation to disk as a sequence of .sim files.

Save to Disk in Background

Starts another copy of Houdini in the background and instructs that copy to save out the simulation as a sequence of .sim files. This allows one to continue working and load the .sim files as they complete.

Valid frame range

Limits the rendering of frames, when set to Render frame range or Render frame range only.

Render any frame

Allow the renderer to render any and all frames.

Render frame range

Only render the frames in the range set below, but allow the renderer to render other frames if they are referenced by in-range frames.

Render frame range only (strict)

Only render the frames in the range set below, and don’t allow the renderer to render other frames, even if they are referenced by in-range frames.

Start/End/Inc

Specifies the range of frames to render (start frame, end frame, and increment). All values may be floating point values. The range is inclusive.

These parameters determine the values of the local variables for the output driver.

Render with Take

Uses the settings in a particular take while rendering. Choose Current to use the current take when rendering.

DOP Path

The DOP network to render from. (You can point to a DOP within a DOP network, but Houdini saves the state of the entire network.)

Output File

The file to save the simulation state to. Make sure to include $SF in the filename to write out separate files for each frame.

Output Every Sim Frame Using $SF

Every single simulation frame will be output, rather than just the frames hit by the step rate of the frame range. In this mode one just has to set the entire range without worrying about how substepping will be set up.

$SF should be used instead of $F in the file name in these cases.

Initialize Simulation OPs

Force all simulation OPs to be reset. This includes DOP Networks, POP SOPs, and other OPs that cache their results.

This is the safest way to render out a simulation, because it starts the simulation from scratch and discards any partial simulations you might have done with different parameters. However, throwing away an already-cooked simulation can be expensive, especially for relatively slow solvers such as fluids.

Compress .sim Files

Determines if .sim files written to disk for caching will be compressed. GZip can provide the best compression, but is incredibly slow. Blosc provides excellent compression and speed so should usually be used.

Alfred Style Progress

A percentage complete value is printed out as files are written. This is in the style expected by Pixar’s Alfred render queue.

Scripts

Pre-Render Script

Run this script before any rendering.

Pre-Frame Script

Run this script before each frame.

Post-Frame Script

Run this script after each frame.

Post-Render Script

Run this script after all rendering.

Render nodes

  • Agent

    This output operator is used to write agent definition files.

  • Alembic

  • 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.

  • 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.

  • 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.

  • 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.

  • 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