"I like your Christ. I do not like your Christians. Your Christians are so unlike your Christ."
- Mahatma Gandhi

Framework 3 (Last updated: February 6, 2017)
Framework 2 (Last updated: October 8, 2006)
Framework (Last updated: October 8, 2006)
Libraries (Last updated: September 16, 2004)
Really old framework (Last updated: September 16, 2004)
Volume Lightmapping
Tuesday, March 2, 2004 | Permalink

Executable
Source code
VolumeLightmapping.zip (1.0 MB)

Required:
GL_ARB_shader_objects
GL_ARB_vertex_shader
GL_ARB_fragment_shader
GL_ARB_shading_language_100
This demo uses a technique that's similar to standard lightmapping, except that this is done in three dimensions. Every point in the room has a light visibility precomputed and stored in a volumetric lightmap. This way you only need a simple texture lookup to determine the amount of light that hits the object. The advantage of this technique is that it's cheap and you get soft shadows for free. The disadvantage is of course that lights must be static. The advantage of the 3D version however is that it unlike 2D lightmaps is also useful for characters and dynamic objects.

The demo should run on Radeon 9500 and up and GFFX. You may have to do a registry tweak to enable GLSL on the GFFX at the moment.