HtoA 3.1.1

11 September 2018


This is a bug fix release, bringing alembic procedural improvements.  


  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:

  • 16.5.496
  • 16.5.536
  • 16.5.571


and for the following platforms:

  • Linux x86_64 (gcc4.8)
  • Windows 7 x64 (vc14)
  • Mac OS X 10.8+ (clang7.3)


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


  • Translate volume shader for custom procedurals (htoa#1095)


  • Fixed alembic procedural motion vectors pass (htoa#1087)

  • alembic packed primitive motion blur issue with SOP transform (htoa#1101)

  • Fixed alembic traversal threading issue (htoa#1103, core#7456)

  • alembic crash fixed with make_instance enabled and changing frames (core#7446)

  • alembic files with single entry array attributes should be considered not arrays (core#7413)

  • Copy id to child alembic nodes (core#7442)

  • Texture baking uv layer fix (htoa#1102)

  • Update state_int node interface (htoa#1096)

  • Gain function in range shader is inverted (core#7477)

Incompatible changes
  • Unpacking alembic packed primitives affected by a scaling transform SOP will affect object space, requiring an adjustment to the displacement scale (htoa#1049)



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


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