This release introduces the following improvements, fixes, and miscellaneous changes.
The /prman/deepcomp/flagvolumes and Option "deep" "int flagvolumes" controls now interpret the value 1 as an "auto" mode. This is on by default, but off if generating any deep images in DTEX format. Use 2 to force it always on.
Path Traced Subsurface Scattering control Zero Scatter Attenuation has been replaced by an IOR parameter causing total internal reflection. Note that your behavior may be different. Increasing the value from the default 1.0 may reduce fireflies in the SSS result, values that are too high may lose energy.
Significant performance increase for UDIM textures when many textures are in one directory
We now warn if a deep image has a pixel filter on alpha that is a poor match for the pixel filter on the other channels. This can lead to grainy noise across the deep image.
GetBuiltinVar queries of k_lpeState or k_wavelength no longer set the result pointer to null during displacement, cached presence or opacity, and baking.
Improved live-render edit speed in cases where several LPE based AOV's were being used.
For user-debugging purposes the RLFInjector can now be made to print out the exact Attribute Identifier path at each binding site by adding "-printaip 1" to the rif arguments. Rif arguments are set up in RfM via RenderMan_for_Maya.ini (see existing doc re -filtergeom). The path that is printed out is precisely the one that Xpath is matching against in a Dynamic Rule and can also be used (in the case of the new alembic-file-specific rlf's) in the Static Binding table.
RenderMan will now abort when attempting to recover non-incremental renders when bucket order is set to anything other than "vertical" or "horizontal".
In OSL, gettattribute() of the "context" object can be used to access the members of the RixShadingContext scTraits structure "eyePath", "lightPath", "primaryHit", "missContext", "reyesGrid" and "shadingMode".
Improved quality of deep output compression when a deep id channel is present.
Fixed a bug where scalar displacement was backwards when dicing an instanced master and the orientation is either "lh" or "rh".
Fixed bug causing potential crash when using aggregate volumes.
Fixed a bug where using alembic archives (AlembicProcPrim) with motion blur would crash on Windows.
Fixed bug that could cause a crash when using a gprim with very many vertices and/or primvars.
Fixed bug causing reduced thread efficiency and potential hangs when rendering many things with different grouping membership, enabled lights, or enabled lightfilters state.
Fixed a potential crash when a hierarchical subdivision mesh specified an invalid face index in a face edit.
Fixed bug causing a very small chance of crashing when rendering a scene containing both infinite and local lights.
Fixed potential for crash or extra memory usage when rendering a large polygon mesh having non-quad faces and __faceindex values for per-face textures.
Fixed tile-shaped artifacts on materials with both subsurface and diffuse transmission.
Fix of incorrect normals of instanced NURBS patches with non-homogeneous control points. Speedup of ray tracing of some NURBS.
In OSL, trace() and getmessage("trace") now work when hit objects are not shaded.
Fixed a bug that could cause incorrect interpolation of primitive variables in some cases of coarsely tessellated displaced surfaces.
Fixed a bug where OSL texture() shadeop would return random values on missing textures instead of the "missingcolor" and "missingalpha" or "fill" values.