Odtnhj

I need to draw outline to the polygon primitive drawn with following code :

 scene.primitives.add( new Cesium.ClassificationPrimitive(
 geometryInstances : new Cesium.GeometryInstance(
 geometry : new Cesium.PolygonGeometry(
 polygonHierarchy : new Cesium.PolygonHierarchy(
 Cesium.Cartesian3.fromDegreesArray(coords)
 ),
 height : height
 ),
 attributes : 
 color: color,
 ,
 id : id,
 description : "Highlight Object",
 )
 ));

Is there any way to draw outline to a polygon primitive? I am aware that it can be added with Entities but the requirement is to use primitives.
Any help is much appreciated.

You can use PolylineCollection as a separate primitive for outline.

I created a demo in Sandcastle showing this use case:

var viewer = new Cesium.Viewer('cesiumContainer');

var coords = [
 -72.0, 40.0,
 -70.0, 35.0,
 -75.0, 30.0,
 -70.0, 30.0,
 -68.0, 40.0
];

var cartesian = Cesium.Cartesian3.fromDegreesArray(coords);

var color = Cesium.Color.DARKRED;
var outlineColor = Cesium.Color.GOLD;

var polygonPrimitive = new Cesium.Primitive(
 geometryInstances: new Cesium.GeometryInstance(
 id: 'polygon',
 geometry: Cesium.PolygonGeometry.createGeometry(
 new Cesium.PolygonGeometry(
 polygonHierarchy: new Cesium.PolygonHierarchy(cartesian)
 )
 )
 ),
 appearance: new Cesium.MaterialAppearance(
 material: new Cesium.Material.fromType('Color', 
 color: color
 )
 ),
 asynchronous: false
);

var polylinePrimitive = new Cesium.PolylineCollection();
polylinePrimitive.add(
 positions: cartesian,
 width: 3.0,
 loop: true,
 material: new Cesium.Material.fromType('Color', 
 color: outlineColor
 )
);

var primitives = viewer.scene.primitives;
primitives.add(polygonPrimitive);
primitives.add(polylinePrimitive);