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Shading Rate II • The default for shading rate is 0.25, which is much smaller than is necessary for most images. • A much more typical number for final rendering is 1.0 to 4.0, and test renderings can usually be done at 16.0 or even larger. • What is the disadvantage? • A shading rate that is too large tends to give blocky looking colours and excessive blur on textures. • The blockiness can often be alleviated by turning on Gouraud shading with the ShadingInterpolation "smooth" call. Saturday, 23 October 2010
Shading Rate III • As long as the colour of an object changes slowly and smoothly across its surface, this will look fine. • Only if the surface has drastic colour changes, such as sharpedged patterns in its textures, will these results be unsatisfactory. • And an object with a shading rate of 16.0 and Gouraud shading will render much faster than an object with a shading rate of 1.0. 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 and 42: Attributes • Attributes are flags
Page 43: Shading Rate • This is probably t
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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