float llAngleBetween(rotation r1, rotation r2)
Return the angle between two rotations.
The first rotation
The second rotation
Returns the angle between the two rotations.
r1 and r2, there is a third rotation that transforms one into the other, given by r2/r1. The angle this function returns is the angle of that last rotation. Therefore, it is roughly equivalent to llRot2Angle(r2/r1).llOwnerSay((string)(llAngleBetween(<0,0,1,0>, <0,1,0,0>)*RAD_TO_DEG)); // displays 180.000000
llRotBetween Rotation between two vectors.llRot2Angle obtains the angle part of a rotation expressed as axis/angle.llRot2Axis obtains the axis part of a rotation expressed as axis/angle.