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CarlBateman
03-01-2012, 10:46 AM
When I give a model a green material and apply a texture to it, only the green pixels are shown.

http://i.imgur.com/SrecY.png
Model with white material

http://i.imgur.com/evabU.png
Model with green material

1. Are textures always blended with materials this way?
2. Can textures completely overwrite materials?

TIA

ZbuffeR
03-01-2012, 10:58 AM
1. The default being GL_MODULATE, yes, unless you ask differently with a different texenv mode :
glTexEnv (GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_DECAL); /* or GL_REPLACE */

Read this for details : http://www.opengl.org/sdk/docs/man/xhtml/glTexEnv.xml

2. yes, with GL_REPLACE. With GL_DECAL however any transparent part of the texture will let through the original material.


BTW, why using green material if you want white ?

CarlBateman
03-01-2012, 01:58 PM
Thanks for the info, enlightening, I can't wait to try it out. :)

I used a green material as a place-holder for development before adding a texture.

I used a white material for debugging.

Since I'm using a texture, I'd rather not use any material, but if the texture were to over-write it, it wouldn't matter which material I was using.

CarlBateman
03-01-2012, 03:05 PM
Just playing around with it, seems to work but now the lighting has no effect.

ZbuffeR
03-01-2012, 03:14 PM
You must use white then.

BionicBytes
03-01-2012, 03:15 PM
For lighting I think you have to use GL_Modulate.
That's why using shaders is sooooo much better!