Angelouscuitry opened this issue on Apr 05, 2007 ยท 30 posts
bagginsbill posted Thu, 05 April 2007 at 4:52 PM
How funny - I just explained this a few days ago.
It is a common misconception that "gray" or numerically .5 means no displacement. In fact it means .5 * the displacement number in the root node.
Black, or 0, means 0 * that value or 0 i.e. no displacement.
White, or 1, means 1 * that value i.e. exactly as specified in the number.
You want to shift everything so that greater than gray (i.e. greater than .5) is positive and darker than gray (i.e. less than .5) is negative. Can you guess how now?
The answer is this: Subtract .5 from your displacement map. In Matmatic you would say:
surface.Displacement = amount_you_want_maximum_up_or_down * 2 * (imagemap - .5)
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