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Y Position
The floor is set to a Y value of (-1), but you can adjust it as needed.
NOTE:
For SkyBox, this value defaults to zero (0).
ELABORATIONS
Mirror
This creates a basic mirror reflection on the floor.
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Shadow Contact
This generates a dark shadowy halo on the floor, without using lights.
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Fog
The fog engulfs the scene and creates a sense of visual depth, thus contributing to a more dramatic scene effect.
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