This is a re-post of old sharing. It was shared in 2007 on scribd (https://www.scribd.com/doc/7346/Reyes-and-Shader-Pipeline), about my some nearly 1st experience and study of Pixar's Renderman Reyes and shader pipeline.

1. Reyes and Shader Pipeline
Shuen-Huei Guan
Digimax Inc.
2007/03/06

2. The Reyes rendering pipeline

3. Reyes: generating ribs
l Maya -- mtor --> .rib

4. Reyes: Geometric Primitives
l Geometric Primitives
- Parametric
Quadrics
- Polygons &
Polyhedra
- ...

5. Reyes: Bounding & Dicing
l Bounding & Spliting
l Dicing

6. Reyes: Bound-Split
l Bounding & Spliting
- viewing volume
- back-face culling
ex, for ambient occlusion
Attribute “cull” “hidden” 0
- to disable bouding of viewing volume/frustrum
l Attribute “cull” “backfacing” 0
- to disable back-face culling

7. Reyes: Dicing
l Dicing
- micropolygons
- Shading Rate
- Bucket Size
- Maximum Grid Size

8. Reyes: Dicing (cont'd)
l Dicing
- Dicing Camera
- Raster Oriented
ex, for ambient occlusion
Attribute “dice” “rasterorient” 0
- view-independent dicing

9. After Bound-Split & Dicing
l Reyes
- Vast visual complexity
- Motion blur
- Speed and memory limitations
l It seems bound-split & dicing is not enought!!!
- Bucketing
- Occlusion Culling

10. Reyes: Shading
l Shading before Hiding
l Parallel Shading
l Antialiasing

11. Reyes: Shading & Bounding(Hiding)
l Shading before Hiding
- Displacement Shader

12. Reyes: Shading Antialising
l Antialiasing
- Supersampling
- Filtering

13. RenderMan shader evaluation pipeline

14. Shader Example
l shader of tb_ch_driver's
face
l Slim's Ensemble
- per-node attributes
- surface + displace +
volume + RIBBox + ...

15. Shader Example: Slim Network

16. RenderMan shader pipeline (review)

17. Terms you should know (from satan)
l Shading Rate
l Quantize/Quantization
l AOV ( Arbitrary Output Variable )/pass
l Motion Blur
l Shutter Angle
l Pixel Samples/Pixel Filter/Filter Width
l Raster Oriented(or not)
l Trace/Shadow Bias
l Samples

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

19. References
l Advanced RenderMan: Creating CGI for Motion Pictures
- Chapter 4, 6
l RenderMan Documentation (on svn machine)
l http://en.wikipedia.org/wiki/Reyes_rendering
l Antialiasing 的理論 by hotball
http://www.csie.ntu.edu.tw/~r89004/hive/aatheory/
page_1.html

20. Following Reading
l Advanced RenderMan
- Chapter 3: Rib Spec
- Chapter 7: Intro to Shading Language
- Chapter 6.5: Rendering Artifacts
l The RenderMan Shading Language Guide
- a book by look dev TD at Walt Disney Feature
Animation Studios.
- TBA: ~March 2007