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Keith P Parsons

3D Depth Transistion Map for particle rendering

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I'm looking at the follow paper which describes low res particle rendering in Destiny.

The paper mentions rendering a separate buffer besides particle color that contains the start and end depth at which a pixel goes from  transparent to fully opaque. Getting the start depth is just a matter of getting the resulting depth buffer since I'm rendering particles from back to front. What I'm not sure on is how to get the depth value for full opacity. Is there a generally accepted way of rendering  this value? I'm wondering if i would need to use some kinda of UAV buffer operation when rendering particles to get the final depth value.







Edited by Keith P Parsons

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