public void AngleSum3d_ReturnsCorrectly()
{
// arrange
Vector3[] polygon = new Vector3[] { Vector3.left, Vector3.up, Vector3.right, Vector3.down };
Vector3 pointInside = Vector3.zero;
Vector3 planarOutside = Vector3.up + Vector3.right;
Vector3 extraplanar = Vector3.forward;
// act
bool inside = Mathf.Approximately(Mathf.PI * 2, PMath.AngleSum3d(pointInside, polygon));
bool outside = Mathf.Approximately(Mathf.PI * 2, PMath.AngleSum3d(planarOutside, polygon));
bool nonPlanar = Mathf.Approximately(Mathf.PI * 2, PMath.AngleSum3d(extraplanar, polygon));
// assert
Assert.IsTrue(inside);
Assert.IsFalse(outside);
Assert.IsFalse(nonPlanar);
}