We head over to the 3D graphics lab, where Scott Sellers of 3dfx is giving a presentation on T-buffer and cinematic effects. I was expecting a rehash of the original 3dfx demonstration from July and am pleasantly surprised to find a more in-depth discussion.
Sellers opens with a discussion of human vision, then discusses aliasing.
The meat of the material is in the technical discussion of T-buffer. However, according to Sellers, the T-buffer is faster but less flexible than an accumulation buffer. Dave asks him to relate T-buffer to bandwidth, and Scott acknowledges that it would take a lot of fill rate and could affect performance depending on the graphics architecture. All the examples revolve around using a 4x4 cell of subpixel samples. The video system averages the four samples and selectively writes them back at varying intensities.