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Shadow mapping on parallax surfaces

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Hi,

I want to get rid of the floating shadows on parallax surfaces by offsetting position. What is the best way to do it? I tried something like: NewPos = Pos + Normal * Height and it works fine when surface is viewed head-on (shadows are distorted across parallax surface), but when its viewed from side I get floating shadows. How can I get rid of them?

Thanks! Edited by SIIYA

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You'll actually want to be adding some fraction of the view vector to the object position, consistent with how the ray-marching/approximate ray-marching works on an intuitive level.

Humus' [url="http://www.humus.name/index.php?page=3D&ID=49"]DXT5nm/3Dc demo[/url] has a workable example, with code.

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