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This language element may be used inside a <trait> block.
EXP may be an expression.
EXP may range from 0 to anything you like. Useful settings will depend on the values in the bump maps you're using. If the bump map goes from 0 to 255 (in other words, if the full dynamic range of a greyscale bump map is utilized,) then useful values will normally be in the 1 to 100 range. Your milage may vary! See also the <bumpmap> language element.