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Basic shading problem (FFP)

Started by Muftobration May 20, 2012 at 9:04 PM 1 replies 1.2k views

Original Post

May 20, 2012 at 9:04 PM

I've been having some shading trouble. The sphere here is just a unit sphere created and triangulated in modo (attached), with normals also computed in modo. The light is in the upper left of the picture a few units away. On average, the shading looks right, but why the huge discrepancy between two triangles from the same quad? I've ruled out incorrectly computed normals and back-facing polygons.

21st Century Moose

May 20, 2012 at 11:11 PM

Looks a lot like you need to set glShadeModel (GL_SMOOTH) here. That should be the default mode, so you may have set it to GL_FLAT somewhere during initialization or you may have a driver bug. See http://www.opengl.org/sdk/docs/man/xhtml/glShadeModel.xml

Muftobration

May 20, 2012 at 11:46 PM

Thank you, mhagain. I was originally using smooth shading, but I thought things just didn't look quite right, so I switched to flat to see if I could make sense of it. Now that I think about it, I guess this is probably how it's supposed to look.

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