Shadow mapping on parallax surfaces

Started by SIIYA, Jun 06 2012 04:13 PM

D3D9 Parallax mapping Shadow mapping floating shadows

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#1 SIIYA Members - Reputation: 299

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Posted 06 June 2012 - 04:13 PM

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, 06 June 2012 - 04:14 PM.

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#2 InvalidPointer Members - Reputation: 920

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Posted 07 June 2012 - 09:38 AM

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' DXT5nm/3Dc demo has a workable example, with code.

clb: At the end of 2012, the positions of jupiter, saturn, mercury, and deimos are aligned so as to cause a denormalized flush-to-zero bug when computing earth's gravitational force, slinging it to the sun.

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#3 SIIYA Members - Reputation: 299

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Posted 07 June 2012 - 01:29 PM

Thanks! I will try it now.

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