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Normal maps?

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jim Joined: 05 Aug 2005 Posts: 400 Location: In The Sun |

Posted: Wed Oct 03, 2007 10:05 pm Post subject: Normal maps? |

Not really programming it, but how's it programmed to DarkPlaces? Which colour is top, which left? Or does it matter? _________________ zbang!

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Sajt Joined: 16 Oct 2004 Posts: 1026 |

Posted: Thu Oct 04, 2007 1:40 am Post subject: |

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.
_________________
F. A. Špork, an enlightened nobleman and a great patron of art, had a stately Baroque spa complex built on the banks of the River Labe.

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jim Joined: 05 Aug 2005 Posts: 400 Location: In The Sun |

Posted: Thu Oct 04, 2007 1:43 pm Post subject: |

Allright, then everything seems to be good with my normal map render settings and the maps... _________________ zbang!

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