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360 degrees shadow speed up

Rasmus · 2010-05-07T16:39:42

Hello This is my first post on this forum and it will probably not be my last :) I have been to this forum several times gathering information about problems I may have, and know I think it is time for me to show myself :) Well, back to the problem.. I am writing my own HLSL shader in Direct3D 9 and just heard of a technic called Deferred Rendering. I found that it was rather easy to insert into the shader I was creating, and all the lights it an handle is to the extreme. But there was one problem that bothered me a bit, I've just completed created lights with shadows that can handle it all directions, meaning I have to render the lights enviorment 6 times, one time for every direction (Up, down, left, right, back, forward). The thing is that this takes alot of the graphiccard, not to render the depthbuffer for the shadows, but to erase the depthbuffer over and over again. I was wondering if there are any faster way to erase textures than clean or fill? Or, if there are some way to cheat on the shadows and not create them in every direction depending on where the camera is. I can set the projection to more than 90 degrees, but still it can't project a view bigger than 45 degrees in ALL directions from the center view. Here is a screenshot on my work, I have keept it simple so far without parallax or bumpmapping.. http://i955.photobucket.com/albums/ae36/ralleman/DMT2Shadows1.jpg