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glVertex2f and glVertex3f

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Greetings How do glVertex2f and glVertex3f work together in a scene? If I drew a cube on the screen using glVertex3f and then drew a square with glVertex2f would the square be on top? If I switched the order would the cube be on top? I guess I'm really wondering what the z vaule is set to for glVertex2f. Thanks.

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The docs say:

When only x and y are specified, z defaults to 0

So glVertex2f(x,y) is the same as glVertex3f(x,y,0.0f)

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