GPU PRO 3

76 I Geometry Manipulation

Figure 4.3. Scene antialiased with GPAA.

in the depth order instead of a neighbor pixel for slightly more accurate results

(see Figures 4.2 and 4.3).

One notable property of GPAA is that it performs really well in all edge angles.

Interestingly, it is the most accurate in the near horizontal and near vertical case,

unlike MSAA and most other antialiasing methods where this is the worst case.

GPAA has its worst case at diagonal edges, where other methods tend to work

the best. But it is worth noting that even in this case, the quality is good.

Figures 4.4(a) and 4.4(b) show a standard pixel-zoomed antialiasing com-

parison.