cesiumDemo/Source/Scene/Empty3DTileContent.js

import defineProperties from '../Core/defineProperties.js';
import destroyObject from '../Core/destroyObject.js';

    /**
     * Represents empty content for tiles in a
     * {@link https://github.com/AnalyticalGraphicsInc/3d-tiles/tree/master/specification|3D Tiles} tileset that
     * do not have content, e.g., because they are used to optimize hierarchical culling.
     * <p>
     * Implements the {@link Cesium3DTileContent} interface.
     * </p>
     *
     * @alias Empty3DTileContent
     * @constructor
     *
     * @private
     */
    function Empty3DTileContent(tileset, tile) {
        this._tileset = tileset;
        this._tile = tile;

        this.featurePropertiesDirty = false;
    }

    defineProperties(Empty3DTileContent.prototype, {
        featuresLength : {
            get : function() {
                return 0;
            }
        },

        pointsLength : {
            get : function() {
                return 0;
            }
        },

        trianglesLength : {
            get : function() {
                return 0;
            }
        },

        geometryByteLength : {
            get : function() {
                return 0;
            }
        },

        texturesByteLength : {
            get : function() {
                return 0;
            }
        },

        batchTableByteLength : {
            get : function() {
                return 0;
            }
        },

        innerContents : {
            get : function() {
                return undefined;
            }
        },

        readyPromise : {
            get : function() {
                return undefined;
            }
        },

        tileset : {
            get : function() {
                return this._tileset;
            }
        },

        tile : {
            get : function() {
                return this._tile;
            }
        },

        url: {
            get: function() {
                return undefined;
            }
        },

        batchTable : {
            get : function() {
                return undefined;
            }
        }
    });

    /**
     * Part of the {@link Cesium3DTileContent} interface.  <code>Empty3DTileContent</code>
     * always returns <code>false</code> since a tile of this type does not have any features.
     */
    Empty3DTileContent.prototype.hasProperty = function(batchId, name) {
        return false;
    };

    /**
     * Part of the {@link Cesium3DTileContent} interface.  <code>Empty3DTileContent</code>
     * always returns <code>undefined</code> since a tile of this type does not have any features.
     */
    Empty3DTileContent.prototype.getFeature = function(batchId) {
        return undefined;
    };

    Empty3DTileContent.prototype.applyDebugSettings = function(enabled, color) {
    };

    Empty3DTileContent.prototype.applyStyle = function(style) {
    };

    Empty3DTileContent.prototype.update = function(tileset, frameState) {
    };

    Empty3DTileContent.prototype.isDestroyed = function() {
        return false;
    };

    Empty3DTileContent.prototype.destroy = function() {
        return destroyObject(this);
    };
export default Empty3DTileContent;