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Grouping Transforms • To group transforms we use the TransformBegin and TransformEnd commands • These are similar to the OpenGL glPushMatrix() and glPopMatrix() and preserve the current transformation state Saturday, 23 October 2010
ouping Transforms 1 ##RenderMan RIB 2 #File transform2.rib 3 #Created by jmacey 4 #Creation Date: Thu Sep 25 10:22:19 2008 5 version 3.04 6 Display "transform2.exr" "framebuffer" "rgba" 7 Format 720 575 1 8 Projection "perspective" 9 WorldBegin 10 Translate 0 0 2 11 TransformBegin 12 Translate -1 0 0 13 Sphere 1 -1 1 360 14 TransformEnd 15 TransformBegin 16 Translate 1 0 0 17 Sphere 1 -1 1 360 18 TransformEnd 19 WorldEnd 1 #!/usr/bin/python 2 # for bash we need to add the following to our .bashrc 3 # export PYTHONPATH=$PYTHONPATH:$RMANTREE/bin 4 import getpass 5 import time 6 # import the python renderman library 7 import prman 8 9 ri = prman.Ri() # create an instance of the RenderMan interface 10 11 filename = "transform2.rib" 12 # this is the begining of the rib archive generation we can only 13 # make RI calls after this function else we get a core dump 14 ri.Begin(filename) 15 # ArchiveRecord is used to add elements to the rib stream in this case comments 16 # note the function is overloaded so we can concatinate output 17 ri.ArchiveRecord(ri.COMMENT, 'File ' +filename) 18 ri.ArchiveRecord(ri.COMMENT, "Created by " + getpass.getuser()) 19 ri.ArchiveRecord(ri.COMMENT, "Creation Date: " +time.ctime(time.time())) 20 21 # now we add the display element using the usual elements 22 # FILENAME DISPLAY Type Output format 23 ri.Display("transform2.exr", "framebuffer", "rgba") 24 # Specify PAL resolution 1:1 pixel Aspect ratio 25 ri.Format(720,575,1) 26 # now set the projection to perspective 27 ri.Projection(ri.PERSPECTIVE) 28 29 # now we start our world 30 ri.WorldBegin() 31 # move back 2 in the z so we can see what we are rendering 32 ri.Translate( 0,0,2) 33 ri.TransformBegin() 34 ri.Translate(-1,0,0) 35 ri.Sphere(1,-1,1,360) 36 ri.TransformEnd() 37 ri.TransformBegin() 38 ri.Translate(1,0,0) 39 ri.Sphere(1,-1,1,360) 40 ri.TransformEnd() 41 ri.WorldEnd() 42 # and finally end the rib file 43 ri.End() 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: Transforms 1 ##RenderMan RIB 2 #Fil
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 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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