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View Full Version : Which one is faster for bump mapping, DOT3 or multitexture?



ingidographics
05-16-2005, 06:44 AM
I am wondering which one is a faster way to do bump mapping, DOT3 or multi-texture?

Thanks, Eric

M/\dm/\n
05-16-2005, 07:26 AM
Multitexture is just emboss bump mapping, that is fake bumpmapping approach. You can run it even on TNT, but quality is way lower.
DOT3 is GF3+ (not MX'es) approach, and yields way better results.

Concerning speed, depends, you might be vertex or fragment bound, new cards will behave differently than old ones.

For 6xxx series, pure bumpmapping is usually free, as you will be CPU bound... I am writing an engine now with multiple lights, parallax mapping into float texture and still speed is more than acceptable (v-synced to monitors ref rate)...