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Attributes II • Within an attribute block, the structure is simple. All attribute settings should follow immediately after the AttributeBegin request. • Geometric transformations are considered attributes in the RenderMan Interface and should also precede any geometry. • Depending on the internal architecture of the modeling software, user entities may be described around a local origin. In this case, a modeling transformation commonly transforms the entity from object space to world space. • If this is not the case, the modeler will probably be working entirely in world space and no modeling transform will be present. • After setting all of the attributes for the entity, the geometry should immediately follow Saturday, 23 October 2010
Shading Rate • This is probably the second most critical factor in the speed performance of RenderMan (exceeded only by the resolution). • This is due to two factors. • First, it governs how often the shading language interpreter runs. Smaller numbers mean the shaders must be evaluated at more places on the surface of the primitives. • Second, it governs how many polygons (micropolygons) are passed through the hidden-surface algorithm. • Smaller numbers mean more micropolygons, requiring more hidden-surface evaluation and more memory to store temporary results. • The end result of all this is that doubling the Shading Rate usually gets you nearly twice the rendering speed. Pretty good! Saturday, 23 October 2010
Page 1 and 2: Introduction to Renderman using the
Page 3 and 4: Renderman Python • As of Version
Page 5 and 6: Hello World Renderman style • A r
Page 7 and 8: Python Version • The python scrip
Page 9 and 10: Python Path 1 #!/usr/bin/python •
Page 11 and 12: Basic Renderman commands 1 import p
Page 13 and 14: Rib layout • When writing rib fil
Page 15 and 16: Set the display options (file,displ
Page 17 and 18: Transforms 1 ##RenderMan RIB 2 #Fil
Page 19 and 20: ouping Transforms 1 ##RenderMan RIB
Page 21 and 22: Affine Transforms 1 import prman 2
Page 23 and 24: Primitives Renderman Primitives [2]
Page 25 and 26: Note Hyperboloid takes two Points a
Page 27 and 28: Parameter Lists • The parameters
Page 29 and 30: What No Cube? • PRman uses patche
Page 31 and 32: Python Cube Function • The previo
Page 33 and 34: Python Dictionaries • Python dict
Page 35 and 36: Adding Colour • To change the col
Page 37 and 38: Attributes 1 WorldBegin 2 Translate
Page 39 and 40: 1 Preamble and global variable decl
Page 41: Attributes • Attributes are flags
Page 45 and 46: Shading Rate III • As long as the
Page 47 and 48: Objects • A single geometric prim
Page 49 and 50: Named Primitives • It is occasion
Page 51 and 52: 1 ri = prman.Ri() # create an insta
Page 53 and 54: Frame Buffer Control • There are
Page 55 and 56: OpenEXR Driver • This display dri
Page 57 and 58: Search Paths • PhotoRealistic Ren
Page 59 and 60: ReadArchive • The ReadArchive com
Page 61 and 62: Procedural Geometry • The torus w
Page 63 and 64: Exercise • Try to build this Scen
Page 65: References • [1] Ian Stephenson.

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