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Computes the orientation of the local x-axis (front-direction of prim) relative to earth (global coordinate system).
Returns a vector that is the forward vector defined by q, i.e. a unit vector pointing in the local positive X direction.
Can be useful to identify the orientation of the local frontal-plane (coronal-plane) of the prim, since it's x-axis is always perpendicular to this local frontal plane.
function vector llRot2Fwd( rotation q );