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llRotBetween
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**##[[rotation]] llRotBetween([[vector]] a, [[vector]] b);##** Returns the [[rotation]] needed to rotate from ##a## to ##b##, 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.'' %%(lsl) 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 %% **Q:** ''Wuh?'' **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// (a [[axis forward]] 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'?'' **A:** 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. ---- [[Functions]] / [[Rotation]]
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