private void GeneratePreviewPixelGrid(ushort maxPreviewDimension, ProgressManager progressManager) { var gridSet = new GridQuantizedSet(this, maxPreviewDimension); var group = new ChunkProcessSet(gridSet); using (var process = progressManager.StartProcess("GeneratePreviewPixelGrid")) { group.Process(GetTileEnumerator(process)); } m_pixelGridSet = gridSet; }