public static float angleBetween(AsVector3D a, AsVector3D b)
{
float aLen = a.getLength();
if (epsilonEquals(aLen, 0))
{
throw new AsArgumentError();
}
float bLen = b.getLength();
if (epsilonEquals(bLen, 0))
{
throw new AsArgumentError();
}
float dotProd = a.x * b.x + a.y * b.y + a.z * b.z;
if (epsilonEquals(dotProd, 0))
{
return(0.5f * AsMath.PI);
}
return(AsMath.acos(dotProd / aLen / bLen));
}
