Coplanarity Artifacts

• When different passes involve different Hardware paths
  
  (Example : Reality Engine : with vs. without Lighting )
  
  
  
• Workaround : Force same path
  
  (Example : Reality Engine : use a black light source )
  
  
  
• glPolygonOffsetEXT() is your friend
  
  
• WORST case for performances : use stencil planes