LlRot2Up

Computes the orientation of the local z-axis relative to the earth.
Returns a vector that is the up vector defined by q, i.e. a unit vector pointing in the positive Z direction

Can be useful to identify the orientation of the local horizontal-plane of the prim, since it's z-axis is always perpendicular to this local horizontal plane.

Mathematically equivalent to:

ret = llVecNorm(<0., 0., 1.> * q);

If q is known to be a unit quaternion then it can be simplified as:

ret = <0., 0., 1.> * q;

Keep in mind that object and agent rotations will always be unit quaternions. For example, <0.0, 0.0, 1.0>*llGetRot() is about 25-30% faster than llRot2Up(llGetRot()) depending on the VM used. If done often and at extremely fast rates, it can be advantageous to even save <0.0, 0.0, 1.0> to a local/global variable and reuse it.

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function vector llRot2Up( rotation q );