Normal maps?
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Normal maps?
by jim » Wed Oct 03, 2007 10:05 pm
Not really programming it, but how's it programmed to DarkPlaces? Which colour is top, which left? Or does it matter?
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by Sajt » Thu Oct 04, 2007 1:40 am
It's standard. RGB=XYZ.
R=0 -> X=-1
R=0.5 (128) -> X = 0
R = 1 (255) ->X = 1
And they're tangent space.
+X=right, +Y=down, +Z=away from the surface. (note that it's also common to have +Y=up, but DarkPlaces has +Y=down).
To get plain Phong shading (as if you had no normal mapping), all the normals should point 'out', which is positive Z. The normal should be 0,0,1, therefore the colour should be 0.5,0.5,1 (aka 128,128,255). It's a light bluish-purple that you commonly see on normal maps.
R=0 -> X=-1
R=0.5 (128) -> X = 0
R = 1 (255) ->X = 1
And they're tangent space.
+X=right, +Y=down, +Z=away from the surface. (note that it's also common to have +Y=up, but DarkPlaces has +Y=down).
To get plain Phong shading (as if you had no normal mapping), all the normals should point 'out', which is positive Z. The normal should be 0,0,1, therefore the colour should be 0.5,0.5,1 (aka 128,128,255). It's a light bluish-purple that you commonly see on normal maps.
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