MeshDisplayCache.cs

class MeshDisplayCache : IDisposable
{
  Dictionary<System.Drawing.Color, Tuple<DisplayMaterial, Mesh>> _meshesToDraw;

  public void Add(System.Drawing.Color color, Mesh mesh)
  {
    if (null == _meshesToDraw)
      _meshesToDraw = new Dictionary<System.Drawing.Color, Tuple<DisplayMaterial, Mesh>>();

    Tuple<DisplayMaterial, Mesh> data;
    if( _meshesToDraw.TryGetValue(color, out data))
    {
      data.Item2.Append(mesh);
    }
    else
    {
      var material = new DisplayMaterial();
      material.Diffuse = color;
      var m = mesh.DuplicateShallow();
      _meshesToDraw.Add(color, new Tuple<DisplayMaterial, Mesh>(material, m));
    }
  }

  public void Draw(DisplayPipeline dp)
  {
    if (null == _meshesToDraw)
      return;
    foreach(var kv in _meshesToDraw)
    {
      dp.DrawMeshShaded(kv.Value.Item2, kv.Value.Item1);
    }
  }


  void DisposeHelper()
  {
    if (_meshesToDraw != null)
    {
      foreach(var kv in _meshesToDraw)
      {
        kv.Value.Item1.Dispose();
        kv.Value.Item2.Dispose();
      }
    }
    _meshesToDraw = null;
  }

  ~MeshDisplayCache()
  {
    DisposeHelper();
  }

  public void Dispose()
  {
    DisposeHelper();
    GC.SuppressFinalize(this);
  }
}