1 / 38

RenderMan - Scene Description -

RenderMan - Scene Description - . Scene Description API. Language Bindings C programming language RenderMan Interface Bytestream Other programming languages C++, Lisp, Tcl, Java, … C RenderMan calls : RIB file. RiAttributeBegin(); RiTranslate(0.0, 14.0, -8.3);

gafna
Download Presentation

RenderMan - Scene Description -

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. RenderMan - Scene Description -

  2. Scene Description API • Language Bindings • C programming language • RenderMan Interface Bytestream • Other programming languages • C++, Lisp, Tcl, Java, … • C RenderMan calls : RIB file RiAttributeBegin(); RiTranslate(0.0, 14.0, -8.3); RiSurface(“plastic”, RI_NULL); RiSphere(1.0, -1.0, 1.0, 360.0, RI_NULL); RiAttributeEnd(); AttributeBegin Translate 0.0, 14.0, -8.3 Surface “plastic” Sphere 1.0, -1.0, 1.0, 360.0 AttributeEnd

  3. Modeling Paradigm • RenderMan allows no froward references of any kind • RenderMan employs a strict hierarchical graphics state for transformation and object attributes • The RenderMan API is extensible by both renderer designders and renderer users

  4. Structure of a Scene Description • Options global to the entire animation • Frame block • Image options • Camera options • World block • Attributes, lights, primitives • Changed options • Another world block • Next frame block

  5. Blocks • WorldBegin, WorldEnd • FrameBegin, FrameEnd frameno • AttributeBegin, AttributeEnd • TransformBegin, TransformEnd • Stacking must always be balanced • AttributeBegin • TransformBegin • AttributeEnd • TransformEnd is not legal

  6. Transformations • Rotate angle vx vy vz • Scale sx sy sz • Skew angle vx vy vz ax ay az • ConcatTransform matrix • Identity • Transform matrix • Identity + ConcatTransform

  7. Camera to Raster Projection Geometry

  8. Image Description • Display filename fileformat imagetype parameterlist • Format xresolution yresolution pixelraspectratio • FrameAspectRatio ratio • Exposure gain gamma • Quantize imagetype one min max dither • PixelSamples nx ny • PixelFilter filtername xwidth ywidth • CropWindow xmin xmax ymin ymax

  9. Camera Description & Render Control • Camera description • Projection type parameterlist • ScreenWindow xmin xmax ymin ymax • Clipping nearplane farplane • Render Control • Hider type parameterlist • Option type parameterlist • RiSynchronize(“abort”)

  10. Primitive Attributes • Color attributes • Color color • Opacity color • Matte flag • Shaders • Surface shadername parameterlist • Displacement shadername paramterlist • Atmosphere shadername paramterlist

  11. Lights • LightSource shadername handle parameterlist • AreaLightSource shadername handle paramterlist • Illuminate handle state

  12. Soft Shadows in RenderMan

  13. Parametric Patches • Basis ubasis ustep vbasis vstep • Patch type parameterlist • PatchMesh type nu uwrap nv vwrap parameterlist • Built-in basis • “bezier”, “bspline”, “catmull-rom”, “hermite” • Type • “bilinear”, “bicubic” • Wrap • “periodic”, “nonperiodic”

  14. patch

  15. NURBS • NuPatch nucv uorder uknot umin umax nvcvs vorder vknot vmin vmax • TrimCurve nloops ncurves order knot min max n u v w

  16. Polygons • Polygon • GeneralPolygon • PointsPolygons • PointsGeneralPolygons

  17. Parametric Quadrics • Cone • Cylinder • Disk • Hyperboloid • Sphere • Paraboloid • Torus

  18. quadrics

  19. quadrics

  20. Subdivision Meshes • SubdivisionMesh • "catmull-clark"

  21. subdivision SubdivisionMesh "catmull-clark"[4 4 4 4 4 4] [0 2 3 1 4 6 7 5 5 1 3 4 2 0 7 6 6 4 3 2 1 5 7 0]["crease" "crease"] [5 1 5 1] [1 5 7 0 1 3 4 6 2 3] [2 2]"P" [ 25 -25 -25 25 25 -25 25 -25 25 25 25 25 -25 25 25 -25 25 -25 -25 -25 25 -25 -25 -25] SubdivisionMesh "catmull-clark"[4 4 4 4 4 4] [0 2 3 1 4 6 7 5 5 1 3 4 2 0 7 6 6 4 3 2 1 5 7 0]"P" [ 25 -25 -25 25 25 -25 25 -25 25 25 25 25-25 25 25 -25 25 -25 -25 -25 25 -25 -25 -25]

  22. SubdivisionMesh "catmull-clark"[4 4 4 4 4 4 4 4 4] [0 4 5 1 1 5 6 2 2 6 7 3 4 8 9 5 5 9 10 6 6 10 11 7 8 12 13 9 9 13 14 10 10 14 15 11]["interpolateboundary"] [0 0] [0] [0]"P" [-60 60 0 -60 20 0 -60 -20 0 -60 -60 0 -20 60 0 -20 20 45 -20 -20 45 -20 -60 0 20 60 0 20 20 45 20 -20 45 20 -60 0 60 60 0 60 20 0 60 -20 0 60 -60 0] SubdivisionMesh "catmull-clark"[4 4 4 4 4 4] [0 2 3 1 4 6 7 5 5 1 3 4 2 0 7 6 6 4 3 2 1 5 7 0]["crease" "crease"] [5 1 5 1] [1 5 7 0 1 3 4 6 2 3] [10 10]"P" [ 25 -25 -25 25 25 -25 25 -25 25 25 25 25 -25 25 25 -25 25 -25 -25 -25 25 -25 -25 -25]

  23. CSG • Constructive Solid Geometry • SolidBegin operation • SolidEnd • operation • “primitive”: leaf node • “union” • “difference” • “intersection”

  24. Reference Geometry • Procedural Primitives • Delayed Read-Archive • Run Program • Dynamic Load

  25. Lightweight Primitives • Point Clouds • Points parameterlist • Curves • Curves type nvertices wrap paramterlist • LOD

  26. LOD example AttributeBegin Detail [-1 1 –1 1 –1 1] DetailRange [0 0 1 4] Procedural “DelayedReadArchive” [ “small.rib” ] [1 –1 –1 1 –1 1] DetailRange [1 4 256 400] Procedural“DelayedReadArchive” [ “medium.rib” ] [1 –1 –1 1 –1 1] DetailRange [256 400 1e38 1e38] Procedural “DelayedReadArchive” [ “big.rib” ] [1 –1 –1 1 –1 1] AttributeEnd

  27. Blobby Implicit Surfaces • Modeling primitive • Blinn’s blobby surface • Nishimura’s metaball • Wyvill’s soft object • Raindrops (“A Bug’s life”) • blending

  28. examples

  29. Body Story

  30. How to Build a Human

More Related