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Simple Maths , Screen coordinate

Started by nini Oct 6, 2004 at 2:29 AM 0 replies 600+ views

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Oct 6, 2004 at 2:29 AM

hi , i'm implementing a lens flare effect , what i'm doing is simple, i translate Light position from World Space to Screen Space like this : LightPos * MatView * MatProj but the coordinate i found are false... how to project LightPos in Screen Coordinate ? Should i take care of ViewPort Transformation & Scaling ? Thanx for your answers ...

_DarkWIng_

Oct 6, 2004 at 4:48 AM

After that matrix multiplication you need to do perspective divide to get normalized device coordinats and then remap them to viewport. I sugest you take a look at redbook how opengl does this. DX probably has simmilar help resources.

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