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Alpha values for each vertex

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Every vertex will use the current color, texture coordinate and normal when glVertex* is called.
glVertex3fv(vertex1); // Will use color1 (and its alpha)

glVertex3fv(vertex2); // Will use color3

Note that in the above example, the second vertex will use color3, since that''s the last color set with glColor* before the glVertex* call.

So to set different alpha values for each vertex, just add a call to glColor* before each glVertex*.

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