> I don't think the Model matrix will help you much either, as IIRC
> (0,0,0) is the center of the earth spheroid.
Hm, the line is
gl_Position = gl_ModelViewProjectionMatrix * gl_Position;
Doesn't gl_ModelViewProjectionMatrix transform things into 2d screen
coordinates?
Would it work if I use a different matrix instead? Apparently
vec4 groundPoint = gl_ModelViewMatrix * vec4(0.0, 0.0, 0.0, 1.0);
can be used to generate the zero altitude point just below the current
view, so then the length of the difference vector dotted with an 'up'
normal would represent altitude (?)
> What do you need it for? sunrise/sunset lighting?
Yes, the earthShade factor should affect objects dependent on their
altitude, basically I want glowing high-altitude clouds whereas the lower
clouds are still dark.
* Thorsten
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