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Midpoint Presentation

Order Independent Transparency

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Sean Lilley

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Current State

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How it works

  • First pass: render transparent objects
    • Stores all fragments into a global array.

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How it works

  • Second pass: resolve transparency
    • For each pixel on the screen, get all its fragments.
    • Sort by depth using bubble sort
    • Blend with colors together, and then blend with the background

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Blending Issues

No moon spots visible through the cube

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Depth Issues

Cube is always drawn above everything else in the scene

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Moving Foward

  • Fix depth and blending issues
  • Look more into GL framebuffers
  • Test on more complicated models
  • Test on more models
  • Improve efficiency for the linked list method
  • Code the array method (using OpenCL for scan)
  • Get performance statistics
  • Think about other stuff to do with per-pixel fragment lists