[osg-users] Problem with shaders

[Guy Lifchitz]

  Hi,
 I have some code in the fragment program that acts really suspiciously it
goes like this:
at the end it suppose to be
for(int iTexture = 0; iTexture < unf_nTextures; ++iTexture)
{
    Color += sampler2D(iTexture, gl_TexCoord[iTexture].st);
}

for debugging purpose I wrote
 for(int iTexture = 0; iTexture < unf_nTextures; ++iTexture)
{
    Color = sampler2D(iTexture, gl_TexCoord[iTexture].st);
}

now I checked by setting the Color in different code that unf_nTextures is
1.
the code above results with Color = 0.0,0.0,0.0,?
on the other hand
 for(int iTexture = 0; iTexture < unf_nTextures; ++iTexture)
{
    Color = sampler2D(0, gl_TexCoord[0].st);
}

results correctly (when there is only one texture of course).

another strange phenomenon is that the code
 for(int iTexture = 0; iTexture < unf_nTextures; ++iTexture)
{
    if(iTexture == 0)
        Color = sampler2D(0, gl_TexCoord[iTexture].st);
}
also results with Color = 0.0,0.0,0.0,?

any ideas?

thanks,
 Guy.
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