Texture transitions?

yes easiest done with glsl, but u can use texture environment combine ( see the interpolate function ) see opengl.org for the extension registry, its prolly also in the spec which can be downloaded from there also

I think multitexturing + combiners would be perfect here. I haven't used it before myself, so I'm not sure why someone said they aren't a good choice (bad hardware support? inefficient?).

Another fairly simple method would be to use alpha blending. That is, draw the quad with the first texture and alpha=1.0. Then, draw the quad again with the second texture and alpha=0.5 (or whatever's appropriate).

The one major thing to watch out for here is to set up the depth test so that the second quad actually gets drawn. So with a depth function set to glDepthFunc(GL_LESS), the second quad probably won't get drawn, whereas glDepthFunc(GL_LEQUAL), the second quad *probably* will get drawn. I say probably, because round errors can give you a pretty ugly effect here.

Actually, now that I've gone through all that, multitexturing + combiners is starting to sound like a much cleaner solution.

The advice is greatly appreciated, the both of you. Thanks!

Quote:

Original post by Kikko-Man I think multitexturing + combiners would be perfect here. I haven't used it before myself, so I'm not sure why someone said they aren't a good choice (bad hardware support? inefficient?).

no one said it wasnt a good choice, just that its probably easiest with shaders

Quote:

Original post by Kikko-Man The one major thing to watch out for here is to set up the depth test so that the second quad actually gets drawn. So with a depth function set to glDepthFunc(GL_LESS), the second quad probably won't get drawn, whereas glDepthFunc(GL_LEQUAL), the second quad *probably* will get drawn. I say probably, because round errors can give you a pretty ugly effect here.

Provided you use exactly the same vertex coordinates and exactly the same transform and rasterization you will get exactly the same depth values.

Enigma