public void ClonePolygon()
{
Vertex a = new Vertex(new Vector3(0, 0, 0), Vector3.Zero);
Vertex b = new Vertex(new Vector3(0, 1, 0), Vector3.Zero);
Vertex c = new Vertex(new Vector3(1, 0, 0), Vector3.Zero);
Polygon abc = new Polygon(a, b, c);
Polygon abc2 = abc.Clone();
Assert.AreEqual(abc.Plane, abc2.Plane);
}
public void UpwardNormals()
{
Polygon p = new Polygon(new[] //Wound anto clockwise
{
new Vertex(new Vector3(0,0,0), Vector3.Zero),
new Vertex(new Vector3(0,0,1), Vector3.Zero),
new Vertex(new Vector3(1,0,1), Vector3.Zero),
new Vertex(new Vector3(1,0,0), Vector3.Zero),
});
Assert.AreEqual(Vector3.Up, p.Plane.Normal);
}
public void NormalWinding()
{
Vertex a = new Vertex(new Vector3(0, 0, 0), Vector3.Zero);
Vertex b = new Vertex(new Vector3(0, 1, 0), Vector3.Zero);
Vertex c = new Vertex(new Vector3(1, 0, 0), Vector3.Zero);
Polygon abc = new Polygon(a, b, c);
Polygon cba = new Polygon(c, b, a);
Vector3 abcNormal = Vector3.Cross(b.Position - a.Position, c.Position - a.Position);
Assert.AreEqual(abcNormal, abc.Plane.Normal);
Vector3 cbaNormal = Vector3.Cross(b.Position - c.Position, a.Position - c.Position);
Assert.AreEqual(cbaNormal, cba.Plane.Normal);
Assert.AreNotEqual(abc.Plane, cba.Plane);
cba.Flip();
Assert.AreEqual(abc.Plane, cba.Plane);
}