GeoScene Maps SDK for .NET 4.1中加载栅格数据，出现了黑色背景。

 string jsonFunction =

@"{

 ""raster_function"":{""type"":""Mask_function""},

    ""raster_function_arguments"":

    {

        ""nodata_values"":{""double_array"":[0],""type"":""Raster_function_variable""},

        ""nodata_interpretation"":{""nodata_interpretation"":""all"",""type"":""Raster_function_variable""},

        ""raster"":{""name"":""raster"",""is_raster"":true,""type"":""Raster_function_variable""},

        ""type"":""Raster_function_arguments""

   },

    ""type"":""Raster_function_template""

    }";





 RasterFunction rasterFunction = RasterFunction.FromJson(jsonFunction);

                // Get the raster function arguments

                RasterFunctionArguments rasterFunctionArguments = rasterFunction.Arguments;

                // Get the list of raster names from the raster function arguments.

                IReadOnlyList<string> rasterNames = rasterFunctionArguments.GetRasterNames();

                // Set the local file raster as a raster name argument.

                rasterFunctionArguments.SetRaster(rasterNames[0], raster);

                // Create a new raster based on the raster function.

                Raster rasterWithFunction = new Raster(rasterFunction);

                // Create a new raster layer from the raster with function applied.

                RasterLayer rasterLayer = new RasterLayer(rasterWithFunction);

                await rasterLayer.LoadAsync();

                MyMapView.Map.OperationalLayers.Add(rasterLayer);

                await MyMapView.SetViewpointGeometryAsync(rasterLayer.FullExtent);