Once you select Shadow Maps in the General Parameters rollout
for a light, the Shadow Map Params rollout appears. It is shown here.
Because this shadow type relies on maps, it is important to be able to control the resolution
of the generated maps. When you are close to a shadow, the resolution needs to be
higher for the cast shadow than if it were farther from the camera in order to avoid jagged
edges around the shadow.
The following parameters are useful for creating Shadow maps:
Bias The shadow is moved, according to the value set, closer or farther away from the
object casting the shadow. Figure 10.68 shows how the bias moves the shadow away the
higher the value is set.
Size Detailed shadows will need detailed Shadow maps. Increase the Size value, and 3ds
Max will increase the number of subdivisions for the map, which in turn increases the
detail of the shadow cast. Figure 10.69 compares a low Shadow Map Size to render the
chessboard with one four times larger. Notice how the shadows on the left (Size = 1024)
are somewhat mushy and less noticeable and the shadows on the right (Size = 4096) are
crisp and clean. You don??™t want to set your Shadow Map size to be too high, though.
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