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GL_NORMALIZE

Started by MARS_999 Jul 7, 2004 at 8:58 PM 3 replies 900+ views

Original Post

MARS_999

363

MARS_999

Jul 7, 2004 at 8:58 PM

This may seem stupid, but do I need to call


glEnable(GL_NORMALIZE);
//or
glEnable(GL_RESCALE_NORMALIZE);

when I have static vertices and already calculated my normals? thanks

Raduprv

202

Raduprv

Jul 7, 2004 at 9:00 PM

No, you need to do that only if you rescale stuff (using the glScalex function).

kburkhart84

318

kburkhart84

Jul 8, 2004 at 12:42 AM

If you have already calculated the normals and they are vectors of length 1(normalized vectors), than neither of these calls is necessary because the GL_NORMALIZE only makes your normal vectors to length 1.

vincoof

Jul 8, 2004 at 5:30 AM

Follow this rules in general :
- if you never call glScale, do not enable any normalizing,
- if you use uniform scaling (eg glScale(2,2,2)) then enable GL_RESCALE_NORMALIZE,
- if you use non-uniform scaling (eg glScale(1,4,2)) then enable GL_NORMALIZE.

[Edited by - vincoof on July 8, 2004 5:30:08 AM]

ff8

Jul 8, 2004 at 7:51 AM

cool rules vincoof

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