rotation llRotBetween(vector a, vector b);
Returns the rotation
needed to rotate from a
, with a center of rotation at <0,0,0>
Note: Be sure to normalize a and b before using llRotBetween, with llVecNorm. This automatically prevents any quirkiness on the part of this function.
vector a = <0,0,1>;
vector b = <1,0,0>;
rotation between = llRotBetween(a, b);
//Ignoring float precision loss these statements below are true.
//a * between == b
//b / between == a
Imagine a cube with an arrow sticking out of it. The base of the arrow is in the center of the cube, and we'll call that <0,0,0> (see next question). This arrow is vector a
vector, if you will). After some arbitrary rotation, the base of the arrow is in the same place, but it's pointing off in some other direction, that's vector b
. So, given vector a
which is the way the cube is facing now, and vector b
, the way you want to be facing, this function returns the rotation you need to get from here to there.
Q: What is a 'center of rotation'?
The center of rotation would be the center of the object that is rotating (the parent object of a link set). The math of this function assumes that the object's center is at <0,0,0>, so if you're getting your vectors from world-coordinates, make sure to subtract the task's position from them.
This article wasn't helpful for you? Maybe the related article at the LSL Portal
is able to bring enlightenment.
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