how to draw polygon on the terrain

CesiumJS
1

polygon: {
                hierarchy: Cesium.Cartesian3.fromDegreesArray([...]),
                material: Cesium.Color.RED.withAlpha(0.5),
                classificationType: Cesium.ClassificationType.BOTH
            }

the polygons I draw are beneath the terrain.in the example code, it covers terrain but this time it cover tiles too. How can I draw a polygon between tiles and ground?

2

Does the drawing on terrain example not work for you? If not, can you provide a screenshot or a minimal code example on Sandcastle showing the issue?

3

If you don’t want the polygon to classify the tileset, you can also set the classificationType to ClassificationType.TERRAIN instead of BOTH (which is both terrain and 3D Tiles).