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Submitted by , posted on 25 December 2002



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This is a screenshot from my latest demo (available with source here: http://esprit.campus.luth.se/~humus/ ). It shows some perpixel phong lighting with shadowmapping. It's done through a fragment program in OpenGL, so it requires a Radeon 9700.

The shadowmapping works for pointlights by rendering the radial distance into a cubemap. To conserve memory and keep high precision I multiply it with 256 and store the fraction in the red channel and the floor in the blue channel. This is the extracted in the fragment program. This way I can get 16bit precision even though I only have 8 bits / channel.

-Humus



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