Oct 16th 2019


This is a feature release bringing IPR improvements for simple arnold properties including subdiv_iterations, subdiv_type and disp_height.  It also fixes IPR updates for instance transforms and alembic reloading.

Important information about Arnold GPU (beta)


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


This release uses Arnold and OpenVDB 4.0.0.

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

  • 16.5.634
  • 17.0.506
  • 17.5.360
  • 17.5.391
  • 17.5.425

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.


  • IPR for simple Arnold Properties (htoa#928)


  • IPR for instance transforms fixed (htoa#589)

  • IPR fixed for alembic instances (htoa#1080)

  • IPR instance regression fixed (htoa#1082)

  • IPR for alembic updates (htoa#1301)
  • Unable to bake the most external UDIMs row and column (htoa#1295)

  • Override shop_materialpath with pack and instance for Copy SOP (htoa#1305)

  • Translate arnold procedural OTL as an alembic (htoa#1317) 

  • alembic child objects inherit visibility from alembic procedural correctly (core#8906)
  • Correct detection of face varying data in alembic procedural (core#8835)
  • Fixed point radius count with velocity motion blur in alembic procedural (core#8791)
  • MaterialX: exporting of closures fixed (core#8893)
  • Matrices on procedural contents fixed when expanding procedurals (core#8911)


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


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