// The smaller of the two possible angles between the two vectors is returned, therefore the result will never be greater than 180 degrees or smaller than -180 degrees.
// If you imagine the from and to vectors as lines on a piece of paper, both originating from the same point, then the /axis/ vector would point up out of the paper.
// The measured angle between the two vectors would be positive in a clockwise direction and negative in an anti-clockwise direction.
public static FP SignedAngle(FPVector from, FPVector to, FPVector axis)
{
FPVector fromNorm = from.normalized, toNorm = to.normalized;
FP unsignedAngle = FPMath.Acos(FPMath.Clamp(Dot(fromNorm, toNorm), -FP.ONE, FP.ONE)) * FPMath.Rad2Deg;
FP sign = FPMath.Sign(Dot(axis, Cross(fromNorm, toNorm)));
return(unsignedAngle * sign);
}
// Returns the angle in degrees between /from/ and /to/. This is always the smallest
public static FP Angle(FPVector from, FPVector to)
{
return(FPMath.Acos(FPMath.Clamp(Dot(from.normalized, to.normalized), -FP.ONE, FP.ONE)) * FPMath.Rad2Deg);
}