ClippingGeometry

new Cesium.ClippingGeometry(viewer)
engine/Source/MapGIS/Scene/ClippingGeometry.js 94

几何体裁剪
几何体裁剪可以裁剪出凹多边形形状
模型的剖切封边功能同时支持对几何体裁剪做封边，但对凹多边形形状的封边效果支持不好。
Name Type Description
viewer Viewer
Example:
let geometryClipper = new Cesium.ClippingGeometry(viewer);
let geometryOption = {
    type: Cesium.ClippingGeometryType.BOX,
    dimensions: new Cesium.Cartesian3(1000.0, 1000.0, 1000.0)
}
geometryClipper.addClipGeometry({
    geometry: geometryOption,
    position: Cesium.Cartesian3.fromDegrees(113.0538, 30.001, -400.0)
});
// 给M3D添加几何体裁剪
M3DSet.geometryClipper = geometryClipper;
// 给地形添加几何体裁剪
viewer.scene.globe.geometryClipper = geometryClipper;

Members

readonly clippingGeometry : Geometry|Model
engine/Source/MapGIS/Scene/ClippingGeometry.js 150

裁剪几何

inverse : Boolean
engine/Source/MapGIS/Scene/ClippingGeometry.js 161

反转裁剪几何区域
只对模型裁剪有效，对地形裁剪无效

Methods

addClipGeometry(options) → Geometry|Model
engine/Source/MapGIS/Scene/ClippingGeometry.js 566

添加一个裁剪几何体
Name Type Description
options Object 裁剪几何体参数
Name Type Description
geometry Object | String 裁剪几何体
裁剪几何体支持内置几何类型ClippingGeometryType和外部的glb类型
position Cartesian3 optional 设置裁剪几何体的位置
ClippingGeometryType.POLYLINEVOLUMEANIMATION,
ClippingGeometryType.POLYLINEVOLUME,
ClippingGeometryType.POLYGON,
ClippingGeometryType.CORRIDOR
这几种类型，由于其顶点数据是世界坐标，所以此属性不会起作用。
Returns:
Example:
// 1. 圆台、圆锥、圆柱几何体
let geometryOption = {
    type: Cesium.ClippingGeometryType.CYLINDER,
    length: 1000,
    topRadius: 500,
    bottomRadius: 500,
    slices: 128
}
geometryClipper.addClipGeometry({
    geometry: geometryOption,
    position: Cesium.Cartesian3.fromDegrees(113.0538, 30.001, -400.0)
});

// 2. 盒子几何体
let geometryOption = {
    type: Cesium.ClippingGeometryType.BOX,
    dimensions: new Cesium.Cartesian3(1000.0, 1000.0, 1000.0)
}
geometryClipper.addClipGeometry({
    geometry: geometryOption,
    position: Cesium.Cartesian3.fromDegrees(113.0538, 30.001, -400.0)
});

// 3. 椭球、球几何体
let geometryOption = {
    type: Cesium.ClippingGeometryType.ELLIPSOID,
    radii: new Cesium.Cartesian3(1000, 500, 500)
}
geometryClipper.addClipGeometry({
    geometry: geometryOption,
    position: Cesium.Cartesian3.fromDegrees(113.0538, 30.001, -400.0)
});

// 4. 通道几何体
let positions = Cesium.Cartesian3.fromDegreesArray([113.05, 30, 113.0538, 30.05])
let geometryOption = {
    type:Cesium.ClippingGeometryType.CORRIDOR,
    cornerType:Cesium.CornerType.MITERED,
    positions: positions,
    extrudedHeight: 500,
    height: -1000,
    width: 1000
}
geometryClipper.addClipGeometry({
    geometry: geometryOption
});

// 5. 多边形几何体
let geometryOption = {
    type: Cesium.ClippingGeometryType.POLYGON,
    positions: [
        113.0405, 30.0171,
        113.0426, 30.0172,
        113.0576, 30.0088,
        113.0540, 30.0,
        113.0513, 29.9885
    ],
    height: -1000,
    extrudedHeight: 500
}
geometryClipper.addClipGeometry({
    geometry: geometryOption
});

// 6. 圆管几何体
let geometryOption = {
    type: Cesium.ClippingGeometryType.POLYLINEVOLUME,
    radius: 500.0,
    positions: [
        Cesium.Cartesian3.fromDegrees(113.0308, 30.0174, -800.0),
        Cesium.Cartesian3.fromDegrees(113.0513, 30.0174, -800.0),
        Cesium.Cartesian3.fromDegrees(113.0807, 29.99, -800.0)
    ]
}
geometryClipper.addClipGeometry({
    geometry: geometryOption
});

// 7. 带顶点动画的圆管几何体
let geometryOption = {
    type: Cesium.ClippingGeometryType.POLYLINEVOLUMEANIMATION,
    radius: 500.0,
    animationDuration: 5,//动画持续时间
    positions: [
        Cesium.Cartesian3.fromDegrees(113.0308, 30.0174, -800.0),
        Cesium.Cartesian3.fromDegrees(113.0513, 30.0174, -800.0),
        Cesium.Cartesian3.fromDegrees(113.0807, 29.99, -800.0)
    ]
}
let geometry = geometryClipper.addClipGeometry({
    geometry: geometryOption
});
geometry.playAnimation() // 播放顶点动画

// 8. 外部glb
let url = "../../SampleData/models/test.glb";
geometryClipper.addClipGeometry({
    geometry: url,
    position: Cesium.Cartesian3.fromDegrees(113.0538, 30.001, -400.0)
});
packages/engine
packages/widgets