Reyes and Shader Pipeline

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Reyes and Shader Pipeline

• Shuen-Huei Guan
• Digimax Inc.
• 2007/03/06

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The Reyes rendering pipeline
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Reyes generating ribs

• Maya -- mtor --gt .rib

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Reyes Geometric Primitives

• Geometric Primitives
• Parametric Quadrics
• Polygons Polyhedra
• ...

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Reyes Bounding Dicing

• Bounding Spliting
• Dicing

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Reyes Bound-Split

• Bounding Spliting
• viewing volume
• back-face culling

• ex, for ambient occlusion
• Attribute cull hidden 0
• to disable bouding of viewing volume/frustrum
• Attribute cull backfacing 0
• to disable back-face culling

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Reyes Dicing

• Dicing
• micropolygons
• Shading Rate
• Bucket Size
• Maximum Grid Size

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Reyes Dicing (cont'd)

• Dicing
• Dicing Camera
• Raster Oriented

• ex, for ambient occlusion
• Attribute dice rasterorient 0
• view-independent dicing

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After Bound-Split Dicing

• Reyes
• Vast visual complexity
• Motion blur
• Speed and memory limitations
• It seems bound-split dicing is not enought!!!
• Bucketing
• Occlusion Culling

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Reyes Shading

• Shading before Hiding
• Parallel Shading
• Antialiasing

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Reyes Shading Bounding(Hiding)

• Shading before Hiding
• Displacement Shader

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Reyes Shading Antialising

• Antialiasing
• Supersampling
• Filtering

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RenderMan shader evaluation pipeline
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Shader Example

• shader of tb_ch_driver's face
• Slim's Ensemble
• per-node attributes
• surface displace volume RIBBox ...

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Shader Example Slim Network
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RenderMan shader pipeline (review)
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Terms you should know (from satan)

• Shading Rate
• Quantize/Quantization
• AOV ( Arbitrary Output Variable )/pass
• Motion Blur
• Shutter Angle
• Pixel Samples/Pixel Filter/Filter Width
• Raster Oriented(or not)
• Trace/Shadow Bias
• Samples

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Reyes VS. OpenGL

• Comparing Reyes and OpenGL on a Stream
  Architecture
• John D. Owens, Brucek Khailany, Brian Towles, and
  William J. Dally
• 2002 Eurographics/SIGGRAPH Workshop on Graphics
  Hardware.

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References

• Advanced RenderMan Creating CGI for Motion
  Pictures
• Chapter 4, 6
• RenderMan Documentation (on svn machine)
• http//en.wikipedia.org/wiki/Reyes_rendering
• Antialiasing ??? by hotballhttp//www.csie.ntu.edu
  .tw/r89004/hive/aatheory/page_1.html

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Following Reading

• Advanced RenderMan
• Chapter 3 Rib Spec
• Chapter 7 Intro to Shading Language
• Chapter 6.5 Rendering Artifacts
• The RenderMan Shading Language Guide
• a book by look dev TD at Walt Disney Feature
  Animation Studios.
• TBA March 2007