DepthFunction

DepthFunction是一个用于指定深度测试函数的对象。

语法

new Cesium.DepthFunction();

属性

DepthFunction对象具有以下属性：

示例

以下是如何使用DepthFunction的示例：

//创建渲染器
var viewer = new Cesium.Viewer('cesiumContainer');

//获取场景
var scene = viewer.scene;

//获取摄像机
var camera = viewer.camera;

//设置深度测试函数为LESS
scene.globe.depthTestAgainstTerrain = true;
scene.globe.baseColor = Cesium.Color.WHITE;
scene.globe.depthFunction = Cesium.DepthFunction.LESS;

//创建一个圆
function createCircle(center, radius) {
    var positions = [];
    for (var i = 0; i < 360; i++) {
        var radians = Cesium.Math.toRadians(i);
        var x = center.x + radius * Math.cos(radians);
        var y = center.y + radius * Math.sin(radians);
        positions.push(scene.globe.ellipsoid.cartographicToCartesian(Cesium.Cartographic.fromDegrees(x, y, 0)));
    }
    return positions;
}

//创建一个圆形实体
var circle = scene.primitives.add(new Cesium.Primitive({
    geometryInstances : new Cesium.GeometryInstance({
        geometry : new Cesium.PolygonGeometry({
            polygonHierarchy : new Cesium.PolygonHierarchy(createCircle(Cesium.Cartesian3.fromDegrees(-75.59777, 40.03883), 100000.0))
        }),
        attributes : {
            color : Cesium.ColorGeometryInstanceAttribute.fromColor(Cesium.Color.GREEN)
        }
    }),
    appearance : new Cesium.PerInstanceColorAppearance({
        closed : true
    })
}));

//设置摄像机位置
camera.setView({
    destination : Cesium.Cartesian3.fromDegrees(-75.59777, 40.03883, 2000000.0)
});

参考

https://cesiumjs.org/Cesium/Build/Documentation/DepthFunction.html