In these pictures, sound sources are visualized with multicolored lines.

The color of the lines signify:

green - First Order Reflections - The first sound reflection is within direct earshot of the listener, and contribute the most to the sound environment, so no further reflections are processed.

red - Occluded Reflections - These reflections are occluded from the listener by BSP geometry. Reflections are calculated until the reflection point is "visible" to the listener

blue - Nth Order Reflections - Reflections are traced until either visiable, or reach a distance threshold

Some of these pictures are "snapshots" where, the visualization is frozen to allow closer inspection