internal static FaceDir RotateBy(this FaceDir faceDir, Rotation r)
{
var f = faceDir.Forward();
var x1 = (int)f.x;
var z1 = (int)f.z;
var(x2, z2) = TopoArrayUtils.SquareRotateVector(x1, z1, r);
if (x1 == x2 && z1 == z2)
{
return(faceDir);
}
if (x2 == 1)
{
return(FaceDir.Right);
}
if (x2 == -1)
{
return(FaceDir.Left);
}
if (z2 == 1)
{
return(FaceDir.Forward);
}
if (z2 == -1)
{
return(FaceDir.Back);
}
throw new System.Exception();
}
/// <summary>
/// Rotates v about the y-axis by r.
/// </summary>
internal static Vector3Int Rotate(Rotation r, Vector3Int v)
{
(v.x, v.z) = TopoArrayUtils.SquareRotateVector(v.x, v.z, r);
return(v);
}