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Flipping axes

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It is often desirable to change the direction of axes in OpenGL. This can be achieved via glScale and glRotate calls.

For example to make z-axis go into the screen, instead of going into the user, use:

glScalef(0,0,-1)

To make XY flat plane and Z going up, use:

glRotatef(-90,0,0,1)
glRotatef(-90,0,1,0)

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