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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 = "HelloWorld.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, 'Comments start with a #') 18 ri.ArchiveRecord(ri.COMMENT, 'File HelloWorld.rib #') 19 ri.ArchiveRecord(ri.COMMENT, "Created by " + getpass.getuser()) 20 ri.ArchiveRecord(ri.COMMENT, "Creation Date: " +time.ctime(time.time())) 21 22 # now we add the display element using the usual elements 23 # FILENAME DISPLAY Type Output format 24 ri.Display("HelloWorld.exr", "framebuffer", "rgba") 25 # Specify PAL resolution 1:1 pixel Aspect ratio 26 ri.Format(720,575,1) 27 # now set the projection to perspective 28 ri.Projection(ri.PERSPECTIVE) 29 30 # now we start our world 31 ri.WorldBegin() 32 # move back 2 in the z so we can see what we are rendering 33 ri.ArchiveRecord(ri.COMMENT, 'move our world back 2 in the z so we can see it') 34 ri.Translate(0,0,2) 35 ri.ArchiveRecord(ri.COMMENT, 'draw a sphere primitive') 36 ri.Sphere (1,-1, 1, 360) 37 # end our world 38 ri.ArchiveRecord(ri.COMMENT, 'end our world') 39 ri.WorldEnd() 40 # and finally end the rib file 41 ri.End() As you can see The rib file created from the python API has no indentation 1 ##RenderMan RIB 2 #Comments start with a # 3 #File HelloWorld.rib # 4 #Created by jmacey 5 #Creation Date: Thu Sep 25 09:51:00 2008 6 version 3.04 7 Display "HelloWorld.exr" "framebuffer" "rgba" 8 Format 720 575 1 9 Projection "perspective" 10 WorldBegin 11 #move our world back 2 in the z so we can see it 12 Translate 0 0 2 13 #draw a sphere primitive 14 Sphere 1 -1 1 360 15 #end our world 16 WorldEnd Saturday, 23 October 2010
Python Path 1 #!/usr/bin/python • The first line of the program is called a hash bang (#!) • it is used to tell the shell where to look for the interpreter for the current script (in this case python) • On most systems python lives in the /usr/bin/python directory so we use put this as the first line of the python script 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: Python Version • The python scrip
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 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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