Hi
Is there any way to do something like this:
(a * b) + (b * c) ?
I don´t know how, but maybe someone else knows of a trick.
Thanks,
Jan.
Hi
Is there any way to do something like this:
(a * b) + (b * c) ?
I don´t know how, but maybe someone else knows of a trick.
Thanks,
Jan.
Just a guess, maybe :
(a + c) * b
Damn it! I made a mistake.
I meant:
(a * b) + (c * d)
Jan.
only with NV_texture_env_combine4
or with more restriction with ATI_texture_env_combine3
maybe you can manage it without if some of your variables are alpha components, but even than it will be really hard without multipassing
NV_texture_env_combine4 does it in a single texture environment.
ATI_texture_env_combine3 requires two texture environments. GL_MODULATE(a,b), then GL_MULTIPLY_ADD_ATI(c,d,GL_PREVIOUS_ARB).
With just vanilla ARB_texture_env_combine it isn’t feasible. There are hacks and approximations, but it’s generally easier and faster to just do a multipass split.
[This message has been edited by zeckensack (edited 12-11-2003).]
Could you perhaps tell us what a, b , c and d is in your case?
(Perhaps if one is a constant or an alpha value we can help?)
Well a and c are textures and b and d are constants.
I didn´t have the time to try it out, yet, but i am quite sure, that it will work with ATI_texture_env_combine3.
Thanks guys.
Jan.