This is a bug fix release, fixing IPR issues.

To make the Arnold hydra plugin available in the staging environment, please either set the PXR_PLUGINPATH_NAME environment variable, or add it in the houdini.env file.   Set the value of PXR_PLUGINPATH_NAME to the location of the hydra folder within the HtoA install tree.  Running the installer with the Install and Configure option will add this to your houdini.env file as part of the install process.


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


This release uses Arnold, OpenVDB 4.0.0 and Arnold-USD (473079dc).

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

  • 17.0.506
  • 17.5.460
  • 18.0.287

and for the following platforms:

  • Linux x86_64 (H16: gcc4.8 and H17: gcc6.3)
  • Windows 7 x64 (H16: vc14 and H17: vc14.1)
  • Mac OS X 10.8+ (clang7.3)


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


  • Kill the hanging hick process remaining after a render restart (htoa#1324)

  • Restart render in IPR after shader parameter change when render is complete (htoa#1357)

  • Fix parsing of HOUDINI_PATH (usd#109)

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


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