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This release uses Arnold and OpenVDB , OpenVDB 4.0.0 and Arnold-USD (0271b7ad).

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

  • 17.0.506
  • 17.5.425
  • 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.


  • IPR updates for light creation and deletion (htoa#499)
  • Export materials (htoa#1315)
  • Import materials (htoa#1314)
  • Import materials with input component connections (htoa#1341)
  • Initial Solaris support for HtoA (htoa#1329)
  • Viewport proxy for arnold procedurals (htoa#1318)
  • Add aov_write_vector shader to prevent clamping on specific AOVs (htoa#1235)
  • Update materialx operator (htoa#1321)
  • Add Role (OCIO) color space family (htoa#1348)
  • Notarise the OSX HtoA installer (htoa#1292)
  • Launch license manager (htoa#1308, htoa#1346)


  • Build psutil on OSX (htoa#1349)
  • OSX installer crashing on extraction (htoa#1352)
  • Int and Bool hydra render settings not coming through in OSX (htoa#1355)

  • Crash when creating the Render Settings LOP (htoa#1353)

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