public void BasicMeshTests()
        {
            var input = CreateBasicMesh();

            var processorContext = new ProcessorContext(TargetPlatform.Windows, "dummy.xnb");
            var processor        = new ModelProcessor
            {
                RotationX = 10,
                RotationY = 20,
                RotationZ = 30
            };
            var output = processor.Process(input, processorContext);

            // The transform the processor above is applying to the model.
            var processorXform = Matrix.CreateRotationZ(MathHelper.ToRadians(30)) *
                                 Matrix.CreateRotationX(MathHelper.ToRadians(10)) *
                                 Matrix.CreateRotationY(MathHelper.ToRadians(20));

            // Test some basics.
            Assert.NotNull(output);
            Assert.NotNull(output.Meshes);
            Assert.AreEqual(2, output.Meshes.Count);
            Assert.NotNull(output.Bones);
            Assert.AreEqual(3, output.Bones.Count);
            Assert.NotNull(output.Root);
            Assert.AreEqual(output.Root, output.Bones[0]);

            // Stuff to make the tests below cleaner.
            var inputMesh1 = input.Children[0] as MeshContent;

            Assert.NotNull(inputMesh1);
            var inputMesh2 = input.Children[1] as MeshContent;

            Assert.NotNull(inputMesh2);

            // Test the bones.
            Assert.AreEqual("Root", output.Bones[0].Name);
            Assert.That(input.Transform, Is.EqualTo(output.Bones[0].Transform).Using(MatrixComparer.Epsilon));
            Assert.AreEqual("Mesh1", output.Bones[1].Name);
            Assert.That(Matrix.Identity, Is.EqualTo(output.Bones[1].Transform).Using(MatrixComparer.Epsilon));
            Assert.AreEqual("Mesh2", output.Bones[2].Name);
            Assert.That(Matrix.Identity, Is.EqualTo(output.Bones[2].Transform).Using(MatrixComparer.Epsilon));

            // Test the first mesh.
            {
                var mesh = output.Meshes[0];
                Assert.AreEqual("Mesh1", mesh.Name);
                Assert.AreEqual(output.Bones[1], mesh.ParentBone);
                Assert.AreEqual(inputMesh1, mesh.SourceMesh);
                Assert.AreEqual(new BoundingSphere(Vector3.Zero, 0), mesh.BoundingSphere);

                Assert.NotNull(mesh.MeshParts);
                Assert.AreEqual(1, mesh.MeshParts.Count);

                var part = mesh.MeshParts[0];
                Assert.NotNull(part);
                Assert.IsNull(part.IndexBuffer);
                Assert.IsNull(part.VertexBuffer);
                Assert.AreEqual(0, part.NumVertices);
                Assert.AreEqual(0, part.PrimitiveCount);
                Assert.AreEqual(0, part.StartIndex);
                Assert.AreEqual(0, part.VertexOffset);

                Assert.IsAssignableFrom <BasicMaterialContent>(part.Material);
                var material = part.Material as BasicMaterialContent;
                Assert.NotNull(material);
                Assert.IsNotEmpty(material.OpaqueData);
                Assert.IsNull(material.Name);
                Assert.IsNull(material.Identity);
                Assert.IsNull(material.Alpha);
                Assert.IsNull(material.DiffuseColor);
                Assert.IsNull(material.EmissiveColor);
                Assert.IsNull(material.SpecularColor);
                Assert.IsNull(material.SpecularPower);
                Assert.IsNull(material.Texture);
                Assert.IsEmpty(material.Textures);
                Assert.IsTrue(material.OpaqueData.ContainsKey("VertexColorEnabled"));
                Assert.IsNotNull(material.VertexColorEnabled);
                Assert.IsFalse(material.VertexColorEnabled.Value);
            }

            // Test the second mesh.
            {
                var mesh = output.Meshes[1];
                Assert.AreEqual("Mesh2", mesh.Name);
                Assert.AreEqual(output.Bones[2], mesh.ParentBone);
                Assert.AreEqual(inputMesh2, mesh.SourceMesh);
                Assert.That(new BoundingSphere(new Vector3(0.3809527f, 0.5858122f, 0.5115654f), 0.8660253f),
                            Is.EqualTo(mesh.BoundingSphere).Using(BoundingSphereComparer.Epsilon));

                Assert.NotNull(mesh.MeshParts);
                Assert.AreEqual(1, mesh.MeshParts.Count);

                var part = mesh.MeshParts[0];
                Assert.NotNull(part);
                Assert.AreEqual(1, part.PrimitiveCount);
                Assert.AreEqual(0, part.StartIndex);
                Assert.AreEqual(0, part.VertexOffset);
                Assert.AreEqual(3, part.NumVertices);

                Assert.NotNull(part.IndexBuffer);
                Assert.AreEqual(3, part.IndexBuffer.Count);
                Assert.AreEqual(0, part.IndexBuffer[0]);
                Assert.AreEqual(1, part.IndexBuffer[1]);
                Assert.AreEqual(2, part.IndexBuffer[2]);

                Assert.NotNull(part.VertexBuffer);
                Assert.NotNull(part.VertexBuffer.VertexData);
                var vertexData = part.VertexBuffer.VertexData;
                Assert.AreEqual(36, vertexData.Length);
                var positionArray = ArrayUtil.ConvertTo <Vector3>(vertexData);
                Assert.AreEqual(3, positionArray.Length);
                Assert.AreEqual(Vector3.Transform(new Vector3(0, 0, 0), processorXform), positionArray[0]);
                Assert.AreEqual(Vector3.Transform(new Vector3(1, 0, 0), processorXform), positionArray[1]);
                Assert.AreEqual(Vector3.Transform(new Vector3(1, 1, 1), processorXform), positionArray[2]);

                Assert.IsAssignableFrom <BasicMaterialContent>(part.Material);
                var material = part.Material as BasicMaterialContent;
                Assert.NotNull(material);
                Assert.IsNotEmpty(material.OpaqueData);
                Assert.AreEqual("Material1", material.Name);
                Assert.IsNull(material.Identity);
                Assert.IsTrue(material.OpaqueData.ContainsKey("Alpha"));
                Assert.NotNull(material.Alpha);
                Assert.AreEqual(0.5f, material.Alpha.Value);
                Assert.IsTrue(material.OpaqueData.ContainsKey("DiffuseColor"));
                Assert.NotNull(material.DiffuseColor);
                Assert.AreEqual(Color.Red.ToVector3(), material.DiffuseColor.Value);
                Assert.IsNull(material.EmissiveColor);
                Assert.IsNull(material.SpecularColor);
                Assert.IsNull(material.SpecularPower);
                Assert.IsNull(material.Texture);
                Assert.IsEmpty(material.Textures);
                Assert.IsTrue(material.OpaqueData.ContainsKey("VertexColorEnabled"));
                Assert.IsNotNull(material.VertexColorEnabled);
                Assert.IsFalse(material.VertexColorEnabled.Value);
            }
        }