GL_NORMALIZE

Graphics and GPU Programming Programming

Started by MARS_999 July 07, 2004 08:58 PM

3 comments, last by ff8 19 years, 9 months ago

MARS_999

1,627

Author

July 07, 2004 08:58 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

997

July 07, 2004 09:00 PM

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

Eternal Lands (free, Open Source MMORPG)

kburkhart84

3,224

July 08, 2004 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

514

July 08, 2004 05:30 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]