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Shadow on moving surface

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Hi friend, I am doing shadows by using usual flat surface shadow equations found in many books. I have tried to draw shadows on the surfaces moving relative to the object but I am having problem when the shadow has to be drawn on a non-flat surface (in Y Plane). I usually end up with disturbing the existing texture in case of these surfaces.ALL Help I want is a Link which can show how to do Moving (can i say Dynamic Shadows here?) Shadows or any clue if you can give to me. Thank you for reading this! ur Friend Yo!!Guess??

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there are many ways of doing shadows check the nvidia developer website for pdf''s of various methods (i believe theres also a pdf comparing various methods)

http://uk.geocities.com/sloppyturds/kea/kea.html
http://uk.geocities.com/sloppyturds/gotterdammerung.html

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