Fixed a bug with the array version of the slerp() VEX function which would sometimes generate incorrect results.

Fixed a bug with the viewport not respecting the HOUDINI_OGL_FIXEDVOXELSIZE environment variable.

Fixed a bug where uniform volume shader would use attributes evaluated when the ray is exiting the volume instead of entering the volume.

Added initial support for Maya 2020.

• Fixes a problem where hou.SceneViewer.setCurrentState would ignore theenter mode flag.
• This fix allows nodeless python states to enter correctly now in supportedcontexts.

Added the Unreal 4.24 plugin.

Unity plugin: Fixed instances not being generated for object istancer.

Fixed a possible bug when custom HDK VEX functions accessed array variables.

Unity plugin:

• Fixed terrain data not being generated in a certain case.
• Allowing terrain size to be smaller than 33 units, which is separatefrom heightmap resolution which does need to be minimum of 33.

Fixed a viewport material update issue when switching from the default viewport material to a real material using shop_materialpath.

Fixed rainbow smoke visualization in the viewport.

TOP Deadline scheduler now supports GPU affinity setting for OpenCL and Redshift nodes. A new GPU affinity Override section on the parm interface provides the functionality to set GPU affinity per job and worker.

Fixed an issue where the RBD Material Fracture SOP could potentially hang when using the CPU OpenCL driver.

Fixed an issue with multiparameter instance labels not updating when inserting a multiparameter instance before the end of the multiparameter list.

Added a fix for possible problems with ROP jobs where PDG_TEMP resolves to a UNC path on Windows farm machines.

Houdini Variables [SESI #83643]

• It was already possible to concatenate env variables from a package. This isjust documenting briefly how to use the syntax.

Fixed a bug where the HDK hcustom tool failed to build plugins on macOS Catalina.

Package - Optix doesn't work with packages but does in .env

• Fixed a bug when processing HOUDINI_NVIDIA_OPTIX_DSO_PATH. The variabledoesn't support multiple paths and was wrongly processed like a regularHoudini path .
• Now processing the variable as a non-path variable.

Fixed a user interface issue with certain multiparameter layouts being constructed incorrectly.

Fixed a bug where pdgmq process would fail to start a second cook on the same machine when the Relay Port was overriden to a specific value.

Fixed a bug where a parameter's Disable When and Hide When conditionals did not apply to its script action button (if any).

Fixed bugs where some SOPs could generate unexpected Deformation Operation undo blocks.

Fixed an issue with task graph serialization incorrectly storing Cached work items in the Failed state.

Fixed relative references in shop_materialpath in the viewport.