public void TestFromColumns()
{
var v1 = new Vector3D(1, 2, 3);
var v2 = new Vector3D(4, 5, 6);
var v3 = new Vector3D(7, 8, 9);
var m = Matrix3D.FromColumns(v1, v2, v3);
Assert.IsTrue(Matrix3D.AreEqual(m, new Matrix3D(new float[, ] {
{ 1, 2, 3 }, { 4, 5, 6 }, { 7, 8, 9 }
}).Transpose()));
}