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(b) Conventional atlas: 37% black.
(c) Packed Ptex atlas: 7% black
Figure 2.4. All textures for the model in (a) are in the packed Ptex format: Albedo, AO,
specular, normal, and vector displacement: (b) an example of a conventional texture
map and (c) an equivalent packed Ptex texture map.
We have a second model, shown in Figure 2.5 , that uses packed Ptex only
for vector displacement. It has a total of 86,954 quads in the base mesh and
is animated with both skinning and blend shapes. When tessellated up to 1.6
million triangles, the cost of displacement lookup is 2.7 ms out of a total of 14.2 ms
with our current implementation.
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