PDA

View Full Version : Compression and Normal Maps



rgpc
08-01-2004, 06:39 PM
FYI - I found this (http://www.gamefinger.com/plan.asp?userid=raduffy&id=16246) an interesting read - from Robert Duffy's plan (http://www.gamefinger.com/plan.asp?userid=raduffy&id=16246) .

Thought it might give someone some ideas/info when doing Normal maps and texture compression.

Humus
08-02-2004, 06:24 PM
Didn't read it, but isn't this just the DXT5 trick, right?

plasmonster
08-02-2004, 08:04 PM
Yeah, looks like they swap red and alpha, very clever.

For anyone interested, here's a link that provides an brief explanation and demo of this technique, among other things. It's in HLSL, but I found it interesting anyway.

http://66.102.7.104/search?q=cache:HGlaZ...XT5+trick&hl=en (http://66.102.7.104/search?q=cache:HGlaZDINYO8J:www.imm.dtu.dk/visiondag/VD03/grafisk/WolfgangEngel.pdf+DXT5+trick&hl=en)