[Flightgear-devel] mapping a texture to a sphere

[Curtis L. O. <cur...@fl...>]

I am posting this on behalf of John Wojnaroski who can read this list, 
but is having trouble with sourceforge bouncing his posts for some reason:

John writes:

Researching how to map a texture to a sphere to build an ADI..

Think I have most of it worked out except the final step

glEnable(GL_TEXTURE_GEN_S);                        // Enable Texture 
Coord Generation For S ( NEW )
glEnable(GL_TEXTURE_GEN_T);                        // Enable Texture 
Coord Generation For T ( NEW )  glTexEnvf(GL_TEXTURE_ENV, 
GL_TEXTURE_ENV_MODE, GL_DECAL);
glBindTexture(GL_TEXTURE_2D, num_adi);
glTexGenf(GL_S, GL_TEXTURE_GEN_MODE, GL_SPHERE_MAP);
glTexGenf(GL_T, GL_TEXTURE_GEN_MODE, GL_SPHERE_MAP);

sets up the texture and generates the coordinates,

then you use gluSphere to build the sphere.  and then I'm stuck

trying to understand how to map the texture onto the vertices of the 
sphere.  Or does that happen by "magic"

ATM all I'm seeing is a wire frame...  something is missing or 
misconfigured or mis -something

Any references, hints, examples would be appreciated...

Thanks
JW