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Patterns & Textures

Notes : 

1. There is no support for custom C++ plugins. Patterns written in OSL are supported
   
   
2. Dynamic String construction in your own patterns is not supported
   
   
3. There is no support for custom plugins
   PxrSeExpr PxrSeExpr is not supported
   
   
4. PxrDirt & PxrCurvature require the trace() OSL call, which is not yet supported.
   Support for a single level of recursion will be added in a future release.
   
   
5. Point clouds are not supported
   
   
6. PxrBakeTexture and PxrBakePointCloud are not supported
   
   
7. Dynamic path construction in your own patterns is not supported, but please note that we do support the following path tokens <UDIM>, <u>, <v>, <U>, <V> and <primstr:varname> that will result in a "dynamic" path to your textures.  <primstr:varname> can be used to reference the value in a constant primvar or user attribute to build a dynamic path.  Also note that <primstr:varname> is not in beta1 for XPU, but will be in a later beta.
   
   
8. XPU samples textures at one MIP level coarser than RIS so that it may store more textures in limited GPU memory.  This results in slightly blurrier renders from XPU than RIS.

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1. Loop Subdivision.  Catmull-Clark for both quads and triangles is supported
   
   
2. Points.  Have been partially implemented.  Point falloff is not yet supported
   
   
3. The built-in curvature is not yet supported
   
   
4. Object attributes such as maxdiffusedepth and maxspeculardepth have not yet been implemented
   
   
5. Deformation motion blur is not yet supported

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