next up previous contents
Next: Incrementally Updating Shadow Up: 11.3.2 Shadow Volumes Previous: Multiple Light Sources   Contents Light Volumes

Light volumes are analogous to shadow volumes; just their interpretation is reversed. Lighting is applied only within the volume, instead of outside it. This technique is useful for generating spotlight type effects, especially if the light shape is complex. A complex shape can result if the light source is partially blocked by multiple objects.