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Contents

Welcome to RenderMan 21.6!

This release introduces the following improvements, fixes, and miscellaneous changes.

  • Added a control for "thickness" for Physical Clear Coats in PxrSurface.
  • Added new ground selections to the PxrEnvDaylight simulation: 
    • Legacy: Old behavior
    • Clamped Hemisphere: "Smear" horizon values on the virtual ground plane
    • Diffuse Ground: A fake infinite ground plane with diffuse color

Miscellaneous Changes

  • Path Traced Sub-Surface Scattering control Zero Scatter Attenuation has been replaced by an IOR parameter causing total internal reflection.
  • Added intensityNearDist parameter to PxrMeshLight.
  • Improved live-render edit speed in cases where several LPE based AOV's were being used.

  • 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".

  • Extended widget types for OSL nodes loaded at startup: 'fileInput', 'assetIdInput', 'filename' (non-standard), 'text', 'popup' and 'boolean'.
  • Fixed a crash when parsing OSL shaders with int parameters using 'min' or 'max' metadata.
  • Improved quality of deep output compression when a deep id channel is present.

  • Increased the upper range for RixKtoRGB, below we show new values above 10000

Bug Fixes

  • Fixed bug causing potential crash when using aggregate volumes.

  • 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.

  • Some fixes for subsurface scattering with the PxrVCM (and PxrUPBP) integrator(s) that may have cause them to render black or with artifacts.
  • 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.

  • Added the correct attribute for importanceMultiplier to the PxrMeshLight
  • 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 possible issue with alpha values on matte objects and volumes.

 

Known Limitations

RenderMan Pro Server

  • Full LPE support is only available with the PxrPathTracer and PxrVCM integrators.
  • Light Filters in the PxrVCM integrator do not affect or shape photon emission.
  • The Cone Angle parameter for lights is incorrect, it does not match the input angle, this will be fixed in a future version.
  • The PxrAovLight does not work properly with PxrUPBP.
  • Analytical lights placed inside volumes may yield artifacts when made visible to the camera. As a workaround, the light camera visibility should be turned off, and a geometry with a similar shape should be used (visible to the camera, invisible to transmission and indirect rays), with the proper emissive bxdf.
  • Using the '.' character in the handle for an OSL shader could cause unpredictable results during re-rendering.
  • Instances are not supported for baking.
  • 3d baking: no direct bake-to-ptex support.
  • PxrBakePointCloud cannot directly render ptex.
  • No RixPTC/pointcloud API (so PxrBakePointCloud cannot read ptc files).
  • Sample/Display filter plug-ins do not have access to lighting services for light dependent effects, e.g. lens flare.
  • Adding new mesh light on existing geometry during IPR results in double geometry.
  • Camera visibility changes are not respected during Live Rendering.
  • For PxrUPBP, If the light source is inside a volume, that volume needs to be defined as Volume “box”
  • For PxrUPBP, To get a volume caustic, the object casting the caustic needs to have higher intersectpriority than the volume.
  • For PxrUPBP, Overlapping heterogeneous volumes are not working yet. (However, overlapping homogeneous volumes do work.) This will be resolved in the future.
  • PxrPortalLight may yield artifacts when generating photons for PxrVCM / PxrUPBP. This will be fixed in a future release.
  • When attempting to access an array primvar, you must first check the size of the array primvar and allocate the appropriate space. Not doing so may lead to a crash.
  • Points and curves cannot have mesh lights attached to them.
  • Deformation motion blurred volumes don't currently work with densityFloatPrimVar or densityColorPrimVar. You will need to use a PxrPrimVar node connected to densityFloat and densityColor instead.