HtoA 4.1.1

10 June 2019


This is a bug fix release, including a fix for rendering curves at small scales.

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
  • 17.5.258
  • 17.5.293
  • 17.5.327

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.


  • Fixed curve rendering artifacts at small scales (core#7891)
  • Matrix array size mismatch when instancing with the instancefile attribute (htoa#1091) 

  • Prevent infinite loop in operator traversal during export (htoa#1226)

  • Changed default and better naming for the texture_accept_untiled option (htoa#1229)

  • Fix alembic transform update on frame change (htoa#1232)

  • Alembic geometry loses shader connections on frame changed (htoa#1233, core#8403)

  • Export varying string attributes as constant arrays (htoa#1236)

  • Bake UDIMs using the UDIM numbers (htoa#1240)

  • Reinstate DWAA compression for monochrome 8-bit textures (htoa#1245)

  • Fix to export image node in operator graph (htoa#1246)

  • Export detail array attributes (htoa#1248)

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


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