Tree Rendering using prman:
Scott Douglas

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• Spotlight 1:
  
• Spotlight 2:
  
• Spotlight Closer Up:
  
• Spotlight & Depth of Field:
  
• Distant Light:
  
• Distant Light & Depth of Field:
  
• Bad Angle / Leaves / Grass Amount:
  
• Fog:
  

Download renderman.cpp to view the C code that outputs the RIB file to generate these images. I have not included the shaders. It's a cpp file because of a quirk with Visual Studio, which is where this code was developed.