This is a feature release, adding the USD procedural via the arnold_procedural OTL.


  1. Get the install files on Downloads.
  2. Follow these installation instructions.


This release uses Arnold, OpenVDB 4.0.0 and Arnold-USD (bed10088).

Binaries available for the following Houdini, Houdini FX, Houdini Indie and Houdini Education production builds:

  • 17.0.506
  • 17.5.460
  • 18.0.348

and for the following platforms:

  • Linux x86_64 (gcc6.3)
  • Windows 7 x64 (vc14.1)
  • Mac OS X 10.11+ (clang7.3)


Please note that Houdini Apprentice does not support third-party renderers and thus cannot run HtoA.


  • #1128 Adding USD procedural support.  The arnold_procedural OBJ node supports rendering and visualization of USD files using the Geometry File parameter.
  • #1384 IPR for the usd procedural update on frame change.
  • #1380 Add the auto_instancing toggle to arnold_procedural OTL to enable auto-instancing of duplicate Arnold procedural nodes created when using .ass files.
  • #1336 Add the string_replace operator which matches and replaces parts of string parameters, optionally depending on the OS Arnold is running on.
  • #1369 Adding tilt/shift options for perspective render camera to control lens tilt angles with respect to the projection plane. This is useful in architectural renderings to compensate perspective transformation for vertical lines. 
  • #1375 Add radial_distortion_type to perspective render camera. 


See also the Arnold release notes for the full list of core enhancements and fixes.


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