Portal-Masked Environment Map Sampling
(Horse Room Image Comparison)

Below you can find interactive versions of the result comparisons for the Horse Room scene from Figure 4 and Table 1 of the paper "Portal-Masked Environment Map Sampling". We compare our new importance sampling technique to three baseline techniques: sampling only the environment map, sampling only the solid angle of the portal, or multiple importance sampling (MIS) of these two previous methods. All images (except for reference) use 8 samples per pixel, but the sampling techniques result in different variance and render times. To quantify the relative performance of each technique in a single representative number, we report the time-to-unit-variance (TTUV)—computed as the MSE × render time—in parentheses.

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Ambient environment map

Factory environment map

Sunny environment map