llRot2Up

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/LSL

Rot2Up

llRot2Up

Summary

Function: vector llRot2Up( rotation q );

0.0	Forced Delay
10.0	Energy

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

• rotation

q

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.

Specification

Mathematically equivalent to: <lsl>ret = llVecNorm(<0., 0., 1.> * q);</lsl> If q is known to be a unit quaternion then it can be simplified as: <lsl>ret = <0., 0., 1.> * q;</lsl> 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.

Examples

<lsl> // Move an object 5 metres forwards along its own z axis, when touched, no matter how the object is oriented in world. default {

   touch_start(integer total_number)
   {
       vector v = llRot2Up( llGetRot() );
       llSetPos( llGetPos() + v * 5.0 );
   }

}

</lsl>

See Also

Functions

•	llRot2Left
•	llRot2Fwd
•	llRot2Axis
•	llRot2Angle

Deep Notes

Signature
function vector llRot2Up( rotation q );