Shadow Algorithms Data Miner

2.4. Shadow Volumes 55

ray traverses the voxels to nd the candidate shadow polygons it should intersect

to increment or decrement the shadow count. Of course, this is quite slow, as Eo

and Kyung are trying to use it in conjunction with regular voxel traversal (see Sec-

tion 2.5.1).

e Z-buer and, in some cases, scanline-based variations tend to be the more

commonly accepted implementations. In Section 2.4.2, we show that for shadow

volumes on the GPU, the Z-buer is employed almost universally in the form of

a stencil buer. Due to the Z-buer and stencil buer approaches, the only ways

to antialias the shadow results is to increase the resolutio