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View Full Version : 8Bit nomals maps vs. 16Bit ones



Tom78
05-15-2003, 12:06 AM
Hi,

i saw the Ferrari Demo on a R9700 now and i have a question on the normalmap format they are using.
I know perpixel lighting on fragment basis, but i used 8x8x8bit components to compute the normalvector. This little demo show the usage of 16x16bits instead. Ofcourse it looks amazing precise, but i don't understand how they compute the third component out of the texture. Can some1 help ?
I know that it uses floatingpoint precision, but how can i recontruct a third component for the normal from a 16x16 texture ?

cu
Tom