var viewer = new Cesium.Viewer('cesiumContainer', {navigationHelpButton: false,animation: false,timeline: false});//坐标var mypositions = Cesium.Cartesian3.fromDegreesArrayHeights([// Triangle A-90.6714, 35.9641, 322.543, -94.6717, 38.9642, 325.51, -97.6717, 35.9639, 324.724,// Triangle B-94.6717, 30.9639, 324.717, -90.6717, 32.9639, 324.724, -94.6717, 34.9639, 324.719]);//加入点var pointCollection = new Cesium.PointPrimitiveCollection();for (var i = 0; i < mypositions.length; i++) {pointCollection.add({position: mypositions[i],color: Cesium.Color.YELLOW})};viewer.scene.primitives.add(pointCollection);//固定相机位置var extent = Cesium.Rectangle.fromDegrees(-98, 30, -90, 39);Cesium.Camera.DEFAULT_VIEW_RECTANGLE = extent;Cesium.Camera.DEFAULT_VIEW_FACTOR = 0.5;//点的数量var numPositions = mypositions.length;//点存储空间var pos = new Float64Array(numPositions * 3);//向量存储空间var normals = new Float32Array(numPositions * 3);for (var i = 0; i < numPositions; ++i) {pos[i * 3] = mypositions[i].x;pos[i * 3 + 1] = mypositions[i].y;pos[i * 3 + 2] = mypositions[i].z;normals[i * 3] = 0.0;normals[i * 3 + 1] = 0.0;normals[i * 3 + 2] = 1.0;}//创建geometryvar geometry = new Cesium.Geometry({attributes: {position: new Cesium.GeometryAttribute({// not FLOATcomponentDatatype: Cesium.ComponentDatatype.DOUBLE, componentsPerAttribute: 3,values: pos}),normal: new Cesium.GeometryAttribute({componentDatatype: Cesium.ComponentDatatype.FLOAT,componentsPerAttribute: 3,values: normals})},primitiveType: Cesium.PrimitiveType.TRIANGLES,boundingSphere: Cesium.BoundingSphere.fromVertices(pos)});//绘制三角带var myInstance = new Cesium.GeometryInstance({geometry: geometry,attributes: {color: Cesium.ColorGeometryInstanceAttribute.fromColor(Cesium.Color.RED)},show: new Cesium.ShowGeometryInstanceAttribute(true)});viewer.scene.primitives.add(new Cesium.Primitive({geometryInstances: [myInstance],asynchronous: false,appearance: new Cesium.PerInstanceColorAppearance({closed: true,translucent: false})}));