GPU Pro 4

1. Real-Time Deep Shadow Maps 263

Figure 1.6. DSMs without filtering (left) exhibit resampling artifacts. Smoother shad-

ows can be achieved with PCF (center), while ESM provides even higher quality (right).

In Table 1.1 we compare the timings for a special version of binary shadow

mapping (simulated by using only the first fragment of a DSM for shading),

DSMs, and DSMs using a 3 × 3anda5× 5 PCF kernel size, respectively, and

show the comparison for several shadow map resolutions. The comparison to this

version of binary shadow mapping demonstrates the overhead of the DSM lookups

(using both optimizations, i.e., neighbor links and truncation of the transmittance ...