public void TestStaticFn_TransformNormal_i ()
{
Double one = 1;
Double six = 6;
Double eight = 8;
Double ten = 10;
Double root3; Maths.Root3 (out root3);
Double pi; Maths.Pi (out pi);
Double minusPi = -pi;
Double piOver2 = pi / (Double) 2;
Double oneOverRoot3 = one / root3;
Double sixTenths = six / ten;
Double eightTenths = eight / ten;
// todo: find a set of 3 fraction that make up a 3D unit vector
// for now just use the 2D one
Vector3 v1 = new Vector3 (sixTenths, 0, eightTenths);
Vector3 v2 = new Vector3 (oneOverRoot3, oneOverRoot3, oneOverRoot3);
Matrix44 rotmati = Matrix44.Identity;
Matrix44 rotmat1; Matrix44.CreateRotationX(ref pi, out rotmat1);
Matrix44 rotmat2; Matrix44.CreateRotationY(ref piOver2, out rotmat2);
Matrix44 rotmat3; Matrix44.CreateRotationZ(ref minusPi, out rotmat3);
Matrix44 rotmat4 = rotmat1 * rotmat2 * rotmat3;
var tests = new Tuple<Vector3, Matrix44, Vector3>[]
{
//normal -> transform -> expected
new Tuple<Vector3, Matrix44, Vector3>(
v1, rotmati, v1),
new Tuple<Vector3, Matrix44, Vector3>(
v1, rotmat1, new Vector3 (sixTenths, 0, -eightTenths)),
new Tuple<Vector3, Matrix44, Vector3>(
v1, rotmat2, new Vector3 (eightTenths, 0, -sixTenths)),
new Tuple<Vector3, Matrix44, Vector3>(
v1, rotmat3, new Vector3 (-sixTenths, 0, eightTenths)),
new Tuple<Vector3, Matrix44, Vector3>(
v1, rotmat4, new Vector3 (eightTenths, 0, -sixTenths)),
//normal -> transform -> expected
new Tuple<Vector3, Matrix44, Vector3>(
v2, rotmati, v2),
new Tuple<Vector3, Matrix44, Vector3>(
v2, rotmat1, new Vector3 (oneOverRoot3, -oneOverRoot3, -oneOverRoot3)),
new Tuple<Vector3, Matrix44, Vector3>(
v2, rotmat2, new Vector3 (oneOverRoot3, oneOverRoot3, -oneOverRoot3)),
new Tuple<Vector3, Matrix44, Vector3>(
v2, rotmat3, new Vector3 (-oneOverRoot3, -oneOverRoot3, oneOverRoot3)),
new Tuple<Vector3, Matrix44, Vector3>(
v2, rotmat4, new Vector3 (oneOverRoot3, oneOverRoot3, -oneOverRoot3)),
};
for (Int32 i = 0; i < tests.Length; ++i)
{
var test = tests [i];
Vector3 normalVec = test.Item1;
Matrix44 trans = test.Item2;
Vector3 expected = test.Item3;
Vector3 result;
Vector3.TransformNormal (ref normalVec, ref trans, out result);
AssertEqualWithinReason(result, expected);
// should also work with the standard transform fn
Vector3.Transform (ref normalVec, ref trans, out result);
AssertEqualWithinReason(result, expected);
}
}
