Image kind of says it all:



Admittedly, I don't use glutSolidTeapot very often -- generally just for throwaway stuff -- but I have no idea why my teapot has an apparent sphincter atop the handle.

I have enabled GL_NORMALIZE, and the rest of the teapot looks great. But what's up with the handle? I don't recall this in earlier GLUT teapots...



( I'm laying the foundation for the LiSPSM demo I'm going to write, and just wanted something on the screen to make certain my lighting pipeline was sane. )

teapot sphincter ...

Maybe you could try the glut_teapot out of my shadow mapping demo. I think I pilfered that one from an Apple example.

The normal is 0,0,0 at that point, so the length of the normal is zero. So the normalized normal is...

Well, that certainly explains it, but I don't recall seeing it in the past, and I don't know why the canonical teapot would have a degenerate normal.

Anyway, I'm not using glutSolidTeapot for the LiSPSM demo, so it doesn't really matter. But I was -- and still am -- a little perturbed.

It's always been that way. But, the interpretation of NaN differs depending on the renderer, so it might have looked OK on your old hardware.

If it bugs you, file a radar!.