cesiumDemo/Source/Scene/QuadtreeOccluders.js

import Cartesian3 from '../Core/Cartesian3.js';
import defineProperties from '../Core/defineProperties.js';
import EllipsoidalOccluder from '../Core/EllipsoidalOccluder.js';

    /**
     * A set of occluders that can be used to test quadtree tiles for occlusion.
     *
     * @alias QuadtreeOccluders
     * @constructor
     * @private
     *
     * @param {Ellipsoid} [options.ellipsoid=Ellipsoid.WGS84] The ellipsoid that potentially occludes tiles.
     */
    function QuadtreeOccluders(options) {
        this._ellipsoid = new EllipsoidalOccluder(options.ellipsoid, Cartesian3.ZERO);
    }

    defineProperties(QuadtreeOccluders.prototype, {
        /**
         * Gets the {@link EllipsoidalOccluder} that can be used to determine if a point is
         * occluded by an {@link Ellipsoid}.
         * @type {EllipsoidalOccluder}
         * @memberof QuadtreeOccluders.prototype
         */
        ellipsoid : {
            get : function() {
                return this._ellipsoid;
            }
        }
    });
export default QuadtreeOccluders;