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Lighting artifact

Started by Promit Jan 6, 2005 at 7:00 PM 2 replies 800+ views

Original Post

Jan 6, 2005 at 7:00 PM

In this shot, the camera position is also the light position. As you can see, the lighting is split somehow; afaict, the left face of the cube is mirrored. This particular lighting method is attenuation maps with self shadowing, but the same error appears when I use dot3 lighting. I suspect it's some kind of problem with the normals, but I'm not sure what to look for. [EDIT] The same artifact appears in hardware TnL. [Edited by - Promit on January 6, 2005 7:20:51 PM]

PfhorSlayer

Jan 6, 2005 at 8:12 PM

Try drawing the normals of the object and verify they point the right direction. This is most easily done by drawing a line from (vertex position) to (vertex position) + (normal).

Promit

Jan 6, 2005 at 8:18 PM

Some of the normals are indeed pointing in the wrong direction.

As it turns out, this box has 20 vertices. I'm not entirely sure what the hell kind of box has 20 vertices (especially given that it's indexed), but I blame MS3D.

So, solved. I guess.

Muse

Jan 6, 2005 at 8:50 PM

That is how MS3D handles the possibility of a discontinuous texture unwrap--which is to say in the worst possible way.

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