Quick Tutorial onStencil Testing

An extra test for fine-grain pixel control



• Standard OpenGL and DirectX 6 feature
• Per-pixel test similar to depth buffering
  • Tests fragment against pixel’s stencil value, rejects fragments that fail
  • Also, can modify pixel’s stencil buffer value based on stencil/depth test results
• Hardware accelerates stencil testing
  • Typically free when depth testing too

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