Release Date

May 21, 2019

This version uses the Arnold core. 



MtoA 3.2.1 is a feature release that is binary compatible with 3.1.* versions. It has the following improvements :


  • Faster GPU cache pre-population. 
  • Arnold RenderView  now displays properly with High DPI monitors. 
  • Improvements in the Operators UI for Standins / Alembic.
  • Added option in ARV to clear the whole arnold session when IPR is stopped. When IPR is restarted, the whole scene is converted from scratch (as with Update Full Scene).
  • aiUserDataColor now supports RGBA data, with an alpha channel.
  • All matrix parameters in shaders can now be exported in motion blur
  • Added more options for exported node names, to control the namespacing as well as the hierarchy separator
  • MaterialX exporter allows to export hierarchy with slash separators, in order to work with exported alembic files
  • Maya Playblasts can be generated from the Arnold Viewport. 

Incompatible changes

  • Displacement shaders are no longer exported with names like "displacementShader1.displacement". Now the name will be just "displacementShader1"



  • Fixed 3.2.0 regressions in Maya Ramp shading
  • Fixed 3.2.0 regressions in Projection shader results
  • Fixed 3.2.0 regression in Image plane when displayMode=None
  • Fixed  vector displacement order with tangent maps
#2598[MAYA-75093] Arnold dpi issue on 4k display and with A/B comparison tool
#3549Support motion blur export of shader matrix parameters
#3668AVP : Make maya playblast work with the AVP
#3688xgen_procedural: inconsistent evaluation of parameters with multithreading disabled
#3712Bifrost procedural not loaded when you add to MTOA_EXTENSIONS_PATH
#3738[ARV] add option to close the arnold session when IPR is stopped
#3749change aiUserDataColor to create user_data_rgba
#3757Workflow issues with materialx and gpuCache
#3772take non-selection based operators into account when adding new operators
#3776Incorrect translation of MayaRamp to ramp_rgb
#3781Image Plane fills alpha channel when Image Plane Display Mode = None
#3782place2DTexture node not translating Wrap U/V for checker
#3784crash when doing Render Sequence while AVP IPR is active
#3787Improve icons in procedural UI
#3788Tangent map vector displacements not in the correct order
#3789Allow to override any node parameter in procedurals UI
#3792Textures not updated in IPR with Substance plugin
#3793Nref warning message
#3795Wrap parameter of Maya projection node doesn't work
#3799Projections not working with motion blur
#3801Displacement shader name exported with a suffix
#3812Crop tool / AB selection tool bugs with HighDPI Fix
#3815error when removing driver from aov
#3464Allow to run "interactive-render" tests in batch
#3671expand ENV vars on standins when inspecting contents
#3756Add more options for exported node names
#3766make the path text copy-able in the procedural operator UI
#3770Make Procedurtal Heirachy UI resize based on number of items expanded
#3771Display custom parameter assignments in the Procedural Operator UI
#3775add inheritance indicator to the procedural tree UI




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