...

• Clamp the topMix parameter of LamaLayer to a [0:1] range to avoid artefacts.
• LamaDielectric: Dispersion can be specified using Abbe numbers.
• An additional refraction roughness control has been added to PxrSurface WalterLobe.
• A crash when LamaLayer parameter "topMix" isn't specified has been fixed.

Patterns

• PxrSetRange: new pattern to remap signals using SeExpr's compress(), expand() and fit() functions.
• PxrArithmetic now support many more functions, mirroring Blender's Math node.
• PxrPhasorNoise: Added direction flow controls to align waves along the vector direction.
• PxrVariable: fixing typos.
• PxrRamp: Added a clamp parameter to keep output between 0 and 1.
• Fixed typo in the argument to Dx() and Dy() in the non-manifold initTxCoords() OSL function. The typo caused incorrect t derivative in non-manifold OSL bump mapping when "invertT" is 1 (which is the default). The bump direction will change in images with OSL bump mapping and "invertT" 1 (which is the default) and the bump amount driven by a non-manifold input. The bump direction now matches the corresponding old C++ bump code and the manifold version of the same code.
• Fixed a bug that could cause a crash when using OSL fmod() with differing variable types.
• It is now possible to compile our patterns without HexTiling functionnalities by passing the PXR_HEXTILE_DISABLED define to oslc.

XPU

• xpu renders from DCC's can now cancelled from "it" (hotkey escape or stop toolbutton). Select object and select shader tools now also function in "it".
• There was a bug in the lerping between MIP map levels in XPU texture() lookups when lerping between the finest and second-finest MIP map level present in a texture map. This has been fixed.
• A problem with missing shadowing of semi-transparent curves (i.e. when using the shadowColor or presence inputs on PxrMarschnerHair) which only affected GPU rendering in XPU has been fixed.
• fixed incorrect shadows which could be cast by volumetric objects in XPU depending on their transform.
• Fixed a bug that could cause crashes when writing AOV's from OSL shaders driving volume inputs.

...

• Add new "live stats enabled" pref for DCCs

• Live stats are now enabled by default.
• Live stats UI panel will now present an error message in the case of a failed connection.

  The color manager now recognizes colorspace name embedded in filenames for lights and lightfilters, in the ACES and Filmic-Blender configs.

  It is now possible to compile our patterns without HexTiling functionnalities by passing the PXR_HEXTILE_DISABLED define to oslc.
  

  A new Option "lighting" "minimumestimate" has
  been added. Non-distant lights whose importance estimate falls
  below the specified value will be culled during direct
  lighting. Increasing this value can speed up scenes where
  direct lighting is expensive, i.e. due to participating media,
  but may lead to noticeable differences in lighting. By
  default, the threshold is 1e-6.

RIS

• A crash when LamaLayer parameter "topMix" isn't specified has been
  fixed.

  You can now override the basis for curves using the -shapeedit flag to the Alembic procedural.

Image Tool

• Fixed

  a

  bug

  where

  deleting

  images

  that

  were

  being

  rendered

  to

  would

  crash

  "it"

  Fixed

  stability

  issues

  when

  running

  live

  stats

  to

  the

  'it'

  HUD

  The

  window

  could

  fail

  to

  resize

  (Ctrl-F)

  correctly

  with

  non-square

  pixels

  images.

...

Hydra Renderer Delegate

• Fixed a bug where file textures from material x networks would appear vertically flipped in RenderMan renders. The old behavior can be restored via the env var HD_PRMAN_MATERIALX_VERTICAL_FLIP=false

• Bail if we see a "multioutput" connection, since these aren't supported yet (Note, studio has added support, but involves a USD change that we're not using yet)

• Fixed an issue for mtlx image files where the rtx plug-in gets referenced. The heuristic for grabbing the texture node ptr was sometimes failing.

• Fixed an issue for tex files: resolve the path, because RenderMan doesn't know about usd file relative paths.

• For mtlx image file nodes without a texcoord connection automatically wire in a mtlx geompropvalue specifying st texture coords

• Fixed

  a

  bug

  where

  toggling

  visibility

  of

  individual

  instances

  would

  lead

  to

  a

  crash.

Other

• A new Option "lighting" "minimumestimate" has been added. Non-distant lights whose importance estimate falls below the specified value will be culled during direct lighting. Increasing this value can speed up scenes where direct lighting is expensive, i.e. due to participating media, but may lead to noticeable differences in lighting. By default, the threshold is 1e-6.
• The color manager now recognizes colorspace name embedded in filenames for lights and lightfilters, in the ACES and Filmic-Blender configs.

  An issue that could cause suboptimal convergence
  of direct lighting from scaled geometry lights has been
  addressed. This fix may cause existing scenes with low sample
  counts to change direct lighting if they were converging
  slowly. If the old incorrect behavior is needed, please use
  Option "lighting" "geometryscalecorrection" [0]. This option
  will not be available in future releases.

  presets can now be renamed in the preset browser, after
        they've been saved.

  Improved performance for edits to large numbers of geometric mesh lights.

  Fixed a potential crash seen on extraordinary
  Catmull-Clark meshes with __faceindex primvar attached.

  ]
  Fixed a bug where attempting to edit an invalid light could lead to a crash.

...

• You can now override the basis for curves using the -shapeedit flag to the Alembic procedural.
• An issue that could cause suboptimal convergence of direct lighting from scaled geometry lights has been addressed. This fix may cause existing scenes with low sample counts to change direct lighting if they were converging slowly. If the old incorrect behavior is needed, please use Option "lighting" "geometryscalecorrection" [0]. This option will not be available in future releases.
• presets can now be renamed in the preset browser, after they've been saved.
• Improved performance for edits to large numbers of geometric mesh lights.
• Fixed a potential crash seen on extraordinary Catmull-Clark meshes with __faceindex primvar attached.
• Fixed a bug where attempting to edit an invalid light could lead to a crash.
• The Alembic procedural will now attempt to apply velocity based motion blur for single frame archives.