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How to specify depend on the height?

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Hi. I know that there is a function in OpenGl to set color of a vertex depend on the height.For example,the heightest is red,or the lowest is darkblue. Somebody knows,please help me. Thank you.

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hi there,
I assume u want the color to be dependant on the Y axis (?)...
if so, just specify the color as dependant on the Y value of the vertic u draw:

glColor3f((GLfloat)y/MAX, (GLfloat)green, (GLfloat)blue);
// y is the Y value of the vertex to draw
// MAX is the top value that Y can get (to keep it bellow 1.0)

just showed the red portion, but u can apply it to any value....

this is just an idea, so you can use any kind of math play there, just try to keep the value below 1.0.

good luck.

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