大多边形渲染不正确

Question

我正在使用 ArcGIS Runtime .NET Quartz Beta

我有一个应用程序需要在 3D 场景视图上渲染大型多边形。

比如我执行这段代码：

            var ContourOverlayScene = CreateGraphicsOverlay("Contours");
            MySceneView.GraphicsOverlays.Add(ContourOverlayScene);


            List<MapPoint> combined = new List<MapPoint>();

            combined.Add(new MapPoint(-160,  20, wgs84));
            combined.Add(new MapPoint( 160,  20, wgs84));
            combined.Add(new MapPoint( 160, -20, wgs84));
            combined.Add(new MapPoint(-160, -20, wgs84));

            var arcpoly = new Esri.ArcGISRuntime.Geometry.Polygon(combined, wgs84);

            ContourOverlayScene.Graphics.Add(new Graphic() { Geometry = arcpoly, Symbol = new SimpleFillSymbol() { Color = Colors.Red } });

给我这个结果（我原以为多边形会环绕地球的大部分）

所以，我将其更改为具有中间点以试图迫使它绕地球一周，如下所示：

            combined.Add(new MapPoint(-160,  20, wgs84));
            combined.Add(new MapPoint(-40, 20, wgs84));
            combined.Add(new MapPoint(40, 20, wgs84));
            combined.Add(new MapPoint( 160,  20, wgs84));
            combined.Add(new MapPoint( 160, -20, wgs84));
            combined.Add(new MapPoint(40, -20, wgs84));
            combined.Add(new MapPoint(-40, -20, wgs84));
            combined.Add(new MapPoint(-160, -20, wgs84));

和生成的图片完全一样....

如何渲染我想要渲染的多边形？

Answer 1

这是 3D 渲染器中的错误。我发现的唯一解决方法是创建两个图形，并且每一半的宽度必须小于 180 度。它甚至在创建具有两个部分的单个多边形时都不起作用（轮廓正确呈现但填充仍然错误）

        var pb = new PolygonBuilder(wgs84);
        combined.Add(new MapPoint(-160, 20, wgs84));
        combined.Add(new MapPoint(0, 20, wgs84));
        combined.Add(new MapPoint(0, -20, wgs84));
        combined.Add(new MapPoint(-160, -20, wgs84));
        pb.AddPart(combined);

        ContourOverlayScene.Graphics.Add(new Graphic() { Geometry = GeometryEngine.Densify(pb.ToGeometry(),1), Symbol = new SimpleFillSymbol() { Color = Colors.Red } });

        pb = new PolygonBuilder(wgs84);

        combined = new List<MapPoint>();
        combined.Add(new MapPoint(0, 20, wgs84));
        combined.Add(new MapPoint(160, 20, wgs84));
        combined.Add(new MapPoint(160, -20, wgs84));
        combined.Add(new MapPoint(0, -20, wgs84));
        pb.AddPart(combined);

        ContourOverlayScene.Graphics.Add(new Graphic() { Geometry = GeometryEngine.Densify(pb.ToGeometry(), 1), Symbol = new SimpleFillSymbol() { Color = Colors.Red } });

我已经在 ArcGIS Runtime 中记录了一个错误，所以希望这个错误可以得到修复 - 但是目前部分 > 180 将按照设计在 3D 中走捷径，所以您可能仍然需要将几何体分成两部分。

大多边形渲染不正确

Large Polygon renders incorrectly

.net

c#

arcgis-runtime