Two texture on a model with different transparency

OpenGL OpenGL: Basic Coding
1

Hi all,

I followed the 3ds loader tutorial to create my application that loads a 3D face with texture from 3ds file. Now I want to add another texture on top of the previous texture with some transparency so I can reflect some new patters on the model.

Can I have overlapping texture on a model with different transparent level? How can I achieve this?

When I call the 2nd texture with transparent level it just replaces the first texture
glBindTexture(GL_TEXTURE_2D, LoadBitmap(“texture2.bmp”);

Thanks in advance.

2

Either you can use a new material shader to handle multiple textures and combine them in some fashion, or you may have to enable GL blend and use a multi-pass approach to render the model.

3

Thanks a lot BionicBytes.
i did it using multi-pass approach[1][2].

when the textures added together the color of the original texture changes, it can be solved by adjusting contrast level[3]

some related links
[1]http://gritche.chez-alice.fr/OpenGL/Technique/reality.sgi.com/jamesb/multi.html
[2]http://www.yaldex.com/game-programming/0131020099_ch18lev1sec6.html
[3]http://www.opengl.org/discussion_boards/ubbthreads.php?ubb=showflat&Number=284362