shader.Use ();

            Vector3 cameraPos = localCamera.Position.ToGLVec3 ();

            float yaw = MathHelper.DegreesToRadians ((float) localCamera.Angle), pitch = MathHelper.DegreesToRadians (MathHelper.Clamp ((float) localCamera.Pitch, -89.9f, 89.9f));
            Matrix4 cameraFrontMatrix = Matrix4.Identity;
            cameraFrontMatrix *= Matrix4.CreateRotationZ (pitch);
            cameraFrontMatrix *= Matrix4.CreateRotationY (yaw);

            Vector3 cameraFront = Vector3.Transform (new Vector3 (1.0f, 0.0f, 0.0f), cameraFrontMatrix).Normalized ();
            Vector3 cameraUp = new Vector3 (0.0f, 1.0f, 0.0f);
            Matrix4 view = Matrix4.LookAt (cameraPos, cameraPos + cameraFront, cameraUp);

            GL.ActiveTexture (TextureUnit.Texture0);
            tex.Bind ();

            Matrix4 model;

            shader.Use ();
            shader.SetMatrix ("view", view, false);
            shader.SetMatrix ("projection", projectionMatrix, false);
            shader.SetVector3 ("viewPos", cameraPos);

            shader.SetInt ("matDiffuse", 0);
            shader.SetInt ("matSpecular", 1);
            shader.SetFloat ("material.shininess", 32.0f);

            shader.SetVector3 ("light.position", cameraPos);
            shader.SetVector3 ("light.direction", cameraFront.Normalized ());
            shader.SetFloat ("light.cutOff", (float) Math.Cos (MathHelper.DegreesToRadians (12.5)));
            shader.SetFloat ("light.outerCutOff", (float) Math.Cos (MathHelper.DegreesToRadians (17.5)));

            shader.SetVector3 ("light.ambient", 0.2f, 0.2f, 0.2f);
            shader.SetVector3 ("light.diffuse", 0.5f, 0.5f, 0.5f);
            shader.SetVector3 ("light.specular", 1.0f, 1.0f, 1.0f);

            shader.SetFloat ("light.constant", 1.0f);
            shader.SetFloat ("light.linear", 0.0014f);
            shader.SetFloat ("light.quadratic", 0.000007f);

            GL.ActiveTexture (TextureUnit.Texture0);
            tex.Bind ();
            GL.ActiveTexture (TextureUnit.Texture1);
            specTex.Bind ();
            GL.BindVertexArray (VAO);

            var axis = new Vector3 (1.0f, 0.3f, 0.5f);
            for (int i = 0; i < 10; i++) {
                model = Matrix4.Identity;
                model *= Matrix4.CreateTranslation (cubePositions [i]);
                model *= Matrix4.CreateScale (8.0f);
                float angle = 20.0f * i;
#pragma warning disable CS0618 // Type or member is obsolete
                model *= Matrix4.Rotate (axis, angle);
#pragma warning restore CS0618 // Type or member is obsolete
                shader.SetMatrix ("model", model, false);

                GL.DrawArrays (PrimitiveType.Triangles, 0, 36);
            }