public void TransformationOfRegion()
{
XbimRect3D r = new XbimRect3D(
100, 100, 0,
200, 200, 0
);
XbimMatrix3D m = XbimMatrix3D.CreateRotation( // 90 ccw
new XbimPoint3D(1, 0, 0),
new XbimPoint3D(0, 1, 0)
);
var rotated = r.Transform(m);
Assert.AreEqual(-300, rotated.Min.X);
Assert.AreEqual(100, rotated.Min.Y);
Assert.AreEqual(0, rotated.Min.Z);
Assert.AreEqual(-100, rotated.Max.X);
Assert.AreEqual(300, rotated.Max.Y);
Assert.AreEqual(0, rotated.Max.Z);
}