I am trying to map a texture to a 3D model (a face). The texture is
actually a single image composed of two images: one taken from one side
and one from the other side. Texture coordinates of my mesh are correct,
I checked by plotting them on the texture.
What happens is that the region of the model where the two textures
should join, is black. I am not that experienced with OpenGL, perhaps I
am doing some stupid mistake, hopefully someone of you has an idea of
what could cause this problem and what to try?