What's wrong with my glutSolidTeapot? - Printable Version
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What's wrong with my glutSolidTeapot? - TomorrowPlusX - Aug 6, 2008 02:29 PM
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. )
What's wrong with my glutSolidTeapot? - AnotherJake - Aug 6, 2008 02:43 PM
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.
What's wrong with my glutSolidTeapot? - arekkusu - Aug 6, 2008 04:25 PM
The normal is 0,0,0 at that point, so the length of the normal is zero. So the normalized normal is...
What's wrong with my glutSolidTeapot? - TomorrowPlusX - Aug 7, 2008 06:48 AM
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.
What's wrong with my glutSolidTeapot? - arekkusu - Aug 7, 2008 10:27 AM
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!.