These illustrate some of our results. More information will be found in the paper. Clicking on each of these figures will bring up a high-resolution version. Note the soft shadows on the leaves. Figure 2 Visualization of the prediction method for coherence-based raytracing.
Gray boxes represent occluded cells, while white boxes are unoccluded cells.
Each cell marked by an X is initially traced. The blue X's are cells at edges between occluded and unoccluded regions, while the red X's are on the exterior edges of the light source. A closeup indicates some artifacts for the left image, and also banding because of fixed light source sampling. However, at normal scales such as those of figure 1, the artifacts are barely visible and are usually tolerable for interactive applications. Since most geometry is thinner than a pixel, the base hardware renderer for layered attenuation maps has severe aliasing but key features like the bottom of the flower being darker than the top are accurately captured.