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- Normally there are an infinite number of repeating bump_maps created over
- every unit square of the X-Y plane like tiles. By adding the keyword 'once'
- after a file name, you can eliminate all other copies of the bump_map except
- the one at (0,0) to (1,1). Areas outside this unit square are treated as
- fully transparent.
-
- NOTE: The "once" keyword may also be used with image_map and material_map
- statements.
-