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Modifying the object in a way that causes rasterization prevents shadows from displaying.
In some cases you may be able to find another way to perform the effect that does not
require rasterization. For example, in the following images, rather than modifying the
opacity of the particle emitter, which causes rasterization, you can modify the opacity of
the particle cells and maintain the shadows.
Emitter set to 100% Opacity
Emitter set to 60% Opacity Particle cells set to 60% Opacity
In the second figure, the layer order of the particle system is affected, and particles appear
in front of the letter A. For more about how rasterization affects shadows, see Shadows
and Rasterization.
Shadows Without Lights
Lighting and shadows can each be disabled independently. You can keep shadows visible,
even when lighting is disabled, allowing you to keep the original unshaded look of the
scene. Turning off lighting also changes the way shadows are rendered.
1281Chapter 21 3D Compositing