Houdini 16.5 Reference

Stand-alone utilities

Houdini includes a large number of useful command-line utility programs.

These programs are in the bin directory in the install directory. Many of these programs are useful for batch processing scripts.

You can get usage information for most programs in $HFS/bin with

program -h

Or, in some cases,

program -


  • abcconvert

    Convert between Alembic formats.

  • abcecho

    Print information about an Alembic file.

  • abcinfo

    Print information about an Alembic file.

  • chchan

    Copies channel collection to/from action channel format.

  • chcp

    Copies channel collection file to another format.

  • chinfo

    Prints information about a channel collection file.

  • claudio

    Copies CHOP data (clip) to/from audio formats.

  • clchan

    Copies CHOP data (clip) to/from action channel format.

  • clchn

    Copies CHOP data (clip) to/from channel collection format.

  • clcp

    Copies CHOP data (clip) to another format.

  • clinfo

    Prints information about a CHOP data (clip) file.

  • dsmconvert

  • dsmmerge

  • dsparse

    Parses and displays dialog scripts.

  • gabc

    Convert between Alembic and Houdini geometry.

  • gconvert

    Convert between Houdini polygon formats.

  • gdxf

    Converts DXF polygons to/from Houdini format.

  • geps

    Converts EPS files to Houdini polygon format.

  • giges

  • ginfo

    Prints polygon file statistics.

  • glightwave

    Converts LightWave files to/from Houdini format.

  • gplay

    Geometry viewer.

  • gptex

    Makes a ptexture image file from a geometry file.

  • greduce

    Reduces polygons in a file.

  • gwavefront

    Converts .obj files to/from Houdini format.

  • hbrickmap

    Converts an i3d file or volume primitive geo/bgeo file into a Pixar brickmap file.

  • hcollapse

    Collapses a directory structure.

  • hcpio

  • hexpand

    Expands hip files into a directory structure.

  • hrender

  • hsc

  • hscript

    Command line HScript interpreter.

  • i3dconvert

  • iautocrop

    Crops images based on pixel values.

  • icineon

    Convert images from 10-bit Cineon format to an 8 bit format.

  • icomposite

  • iconvert

    Converts image formats.

  • icp

    Isolate a region of an image in a new image.

  • iflip - Flip Image

  • ihot

    Scans an image for video-unsafe colors.

  • iinfo

    Outputs information about an image.

  • ilut

    Generates a lookup table (LUT) from standard channel formats or another LUT.

  • ilutcomp

    Generates a single lookup table (LUT) from from two LUTs.

  • ilutinfo

    Prints information about a lookup table (LUT) file.

  • imdisplay

    Sends an image to an mdisplay window.

  • iprint

    Prints the RGBA values for an image as text.

  • iquantize

    Reduces the number of colors in an image.

  • isixpack

    Generates an environment/reflection map from six images representing the six sides of a cube, or a cross image.

  • itilestitch

    Assemble a series of image files with crop windows into a single image.

  • izg

    Converts Z-depth images to 8-bit grayscale images.

  • izmatte

    Composites RGB and Z-depth images.

  • mcacclaim

    Converts an Acclaim motion file to a Houdini script and channel file(s).

  • mcbiovision

    Converts a BioVision motion file to a Houdini script and channel file(s).

  • mcmotanal

    Converts a Motion Analysis TRC motion file to a Houdini script and channel file(s).

  • mcp

    Convert an image sequence to a movie file.

  • minfo

    Prints information about movie files.

  • siminfo

    Prints simulation cache file statistics.

  • spy

    Shell utility for navigating the UNIX filesystem.

  • vexcache

    Query or modify the VEX compile cache.

  • vexexec

    Execute a cvex shader.


User interface

  • Menus

    Explains each of the items in the main menus.

  • Viewers

    Viewer pane types.

  • Panes

    Documents the options in various panes.

  • Windows

    Documents the options in various user interface windows.


  • Expression functions

    Expression functions let you compute the value of parameters.

  • Expression cookbook

    Tips and tricks for writing expressions to accomplish various effects.

  • Python Scripting

    How to script Houdini using Python and the Houdini Object Model.

  • VEX

    VEX is a high-performance expression language used in many places in Houdini, such as writing shaders.

  • HScript commands

    HScript is Houdini’s legacy scripting language.

Command line

Guru level