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Shading Rate III • One of the most important things to remember about the Shading Rate and Shading Interpolation values is that they are Attributes. • That is, they can be changed from one primitive to the next. • So, if you have a finely patterned vase sitting in a room with flat white walls, the vase can have a small shading rate (like 1.0) to capture its detail • while the walls can have a very large shading rate (like 64.0) to save time (with no visible problems). • This is a very powerful technique that amounts to telling the renderer which objects to spend time getting right and which objects are boring and can be handled simply. Saturday, 23 October 2010
Objects • A single geometric primitive or a list of geometric primitives may be retained by enclosing them with ObjectBegin and ObjectEnd. • The RenderMan Interface allocates and re-turns an ObjectHandle for each retained object defined in this way. • This handle can subsequently be used to reference the object when creating instances with ObjectInstance. • Objects are not rendered when they are defined within an ObjectBegin- ObjectEnd block; only an internal definition is created. • Transformations, and even Motion blocks, may be used inside an Object block, though they obviously imply a relative transformation to the coordinate system active when the Object is instanced. • All of an object's attributes are inherited at the time it is instanced, not at the time at which it is created. 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 and 44: Shading Rate • This is probably t
Page 45: Shading Rate III • As long as the
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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