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I have this Window on World projection that is displayed on a horizontal table. This means that I have to change the direction of the stereo offset depending on the user's position relative to the table.
Simply offsetting pos[0] += IPD/2, like in the code above, is only there for you to get a hint at what I'm trying to accomplish. The acctual code used breaks down to finding a vector from pos to origo, imagine a plane with this vector as its normal vector, calculate the plane's side vector, then offset the position by IPD/2 along this side vector.
It would be great if I could do this through hardware, but viz.QUAD_BUFFER and the likes never change the direction of the offset. That's why I'm doing this manually.
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