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CSG + GPU + shader language

Started by x452Alba Feb 15, 2007 at 1:41 AM 1 replies 1.9k views

Original Post

Feb 15, 2007 at 1:41 AM

Hi all, Just wondering if it was possible to perform CSG (constructive solid geometry) exclusively on the GPU using a shading language, for example, GLSL or HLSL? I've never seen it done before using a shading language on the GPU, but I have seen it done using the stencil buffer with the FF (fixed function) pipeline. Would it be simple or complex with headaches? I'm just wanting to use simple spheres with the basic union, addition and subtraction operations. Any ideas or suggestions? Thanks in advance.

Zipster

511

Zipster

Feb 15, 2007 at 2:44 AM

Anything you do on the fixed-function pipeline can easily be implemented in the programmable pipeline. The most basic CSG ray-tracer only requires Z-ordered intersection information (as well as the desired boolean operation) to properly shade each pixel, so using the stencil buffer I see no reason why you wouldn't be able to perform CSG so long as you render front/back faces in the right order.

Also, addition is synonymous with union since we're only interested in shaded surfaces.

x452Alba

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x452Alba

Feb 15, 2007 at 3:23 PM

Sorry, I ment to say union, *intersection* and difference (subtraction).

Any more advice?

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