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simple question

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Hmmm, off the top of my head you need to take the cross-product of the plane normal & the vehicle orientation vector (ie straight up from the roof). Use the resultant vector in glRotate3f(rx,ry,rz,d) where d is the number of degrees to rotate (ie the number of degrees between the vehicle vector & the plane normal) which you can find using a dot-product.
I dunno if that will work, but it should be a step in the right direction.

Brad

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