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/// <summary>
        /// Helper function sets up the graphics device and
        /// effect ready for drawing instanced geometry.
        /// </summary>
        void SetRenderStates(InstancingTechnique instancingTechnique,
                             Matrix view, Matrix projection)
        {
            // Set the graphics device to use our vertex data.
            graphicsDevice.VertexDeclaration = vertexDeclaration;
            graphicsDevice.Vertices[0].SetSource(vertexBuffer, 0, vertexStride);
            graphicsDevice.Indices = indexBuffer;

            // Make sure our effect is set to use the right technique.
            if (techniqueChanged)
            {
                string techniqueName = instancingTechnique.ToString();
                effect.CurrentTechnique = effect.Techniques[techniqueName];
                techniqueChanged = false;
            }

            // Pass camera matrices through to the effect.
            effect.Parameters["View"].SetValue(view);
            effect.Parameters["Projection"].SetValue(projection);
            //effect.Parameters["TargetColor"].SetValue(Color.Green.ToVector3());