text: define([
          '../Core/BoxGeometry',
          '../Core/BoxOutlineGeometry',
          '../Core/Cartesian3',
          '../Core/Check',
          '../Core/Color',
          '../Core/ColorGeometryInstanceAttribute',
          '../Core/defined',
          '../Core/defineProperties',
          '../Core/DeveloperError',
          '../Core/DistanceDisplayConditionGeometryInstanceAttribute',
          '../Core/GeometryInstance',
          '../Core/GeometryOffsetAttribute',
          '../Core/Iso8601',
          '../Core/OffsetGeometryInstanceAttribute',
          '../Core/ShowGeometryInstanceAttribute',
          '../Scene/HeightReference',
          '../Scene/MaterialAppearance',
          '../Scene/PerInstanceColorAppearance',
          './heightReferenceOnEntityPropertyChanged',
          './ColorMaterialProperty',
          './DynamicGeometryUpdater',
          './GeometryUpdater',
          './Property'
      ], function(
          BoxGeometry,
          BoxOutlineGeometry,
          Cartesian3,
          Check,
          Color,
          ColorGeometryInstanceAttribute,
          defined,
          defineProperties,
          DeveloperError,
          DistanceDisplayConditionGeometryInstanceAttribute,
          GeometryInstance,
          GeometryOffsetAttribute,
          Iso8601,
          OffsetGeometryInstanceAttribute,
          ShowGeometryInstanceAttribute,
          HeightReference,
          MaterialAppearance,
          PerInstanceColorAppearance,
          heightReferenceOnEntityPropertyChanged,
          ColorMaterialProperty,
          DynamicGeometryUpdater,
          GeometryUpdater,
          Property) {
      'use strict';
  
      var defaultOffset = Cartesian3.ZERO;
  
      var offsetScratch = new Cartesian3();
      var positionScratch = new Cartesian3();
      var scratchColor = new Color();
  
      function BoxGeometryOptions(entity) {
          this.id = entity;
          this.vertexFormat = undefined;
          this.dimensions = undefined;
          this.offsetAttribute = undefined;
      }
  
      /**
       * A {@link GeometryUpdater} for boxes.
       * Clients do not normally create this class directly, but instead rely on {@link DataSourceDisplay}.
       * @alias BoxGeometryUpdater
       * @constructor
       *
       * @param {Entity} entity The entity containing the geometry to be visualized.
       * @param {Scene} scene The scene where visualization is taking place.
       */
      function BoxGeometryUpdater(entity, scene) {
          GeometryUpdater.call(this, {
              entity : entity,
              scene : scene,
              geometryOptions : new BoxGeometryOptions(entity),
              geometryPropertyName : 'box',
              observedPropertyNames : ['availability', 'position', 'orientation', 'box']
          });
  
          this._onEntityPropertyChanged(entity, 'box', entity.box, undefined);
      }
  
      if (defined(Object.create)) {
          BoxGeometryUpdater.prototype = Object.create(GeometryUpdater.prototype);
          BoxGeometryUpdater.prototype.constructor = BoxGeometryUpdater;
      }
  
      defineProperties(BoxGeometryUpdater.prototype, {
          /**
           * Gets the terrain offset property
           * @type {TerrainOffsetProperty}
           * @memberof BoxGeometryUpdater.prototype
           * @readonly
           */
          terrainOffsetProperty: {
              get: function() {
                  return this._terrainOffsetProperty;
              }
          }
      });
  
      /**
       * Creates the geometry instance which represents the fill of the geometry.
       *
       * @param {JulianDate} time The time to use when retrieving initial attribute values.
       * @returns {GeometryInstance} The geometry instance representing the filled portion of the geometry.
       *
       * @exception {DeveloperError} This instance does not represent a filled geometry.
       */
      BoxGeometryUpdater.prototype.createFillGeometryInstance = function(time) {
          //>>includeStart('debug', pragmas.debug);
          Check.defined('time', time);
  
          if (!this._fillEnabled) {
              throw new DeveloperError('This instance does not represent a filled geometry.');
          }
          //>>includeEnd('debug');
  
          var entity = this._entity;
          var isAvailable = entity.isAvailable(time);
  
          var show = new ShowGeometryInstanceAttribute(isAvailable && entity.isShowing && this._showProperty.getValue(time) && this._fillProperty.getValue(time));
          var distanceDisplayCondition = this._distanceDisplayConditionProperty.getValue(time);
          var distanceDisplayConditionAttribute = DistanceDisplayConditionGeometryInstanceAttribute.fromDistanceDisplayCondition(distanceDisplayCondition);
  
          var attributes = {
              show : show,
              distanceDisplayCondition : distanceDisplayConditionAttribute,
              color : undefined,
              offset: undefined
          };
          if (this._materialProperty instanceof ColorMaterialProperty) {
              var currentColor;
              if (defined(this._materialProperty.color) && (this._materialProperty.color.isConstant || isAvailable)) {
                  currentColor = this._materialProperty.color.getValue(time, scratchColor);
              }
              if (!defined(currentColor)) {
                  currentColor = Color.WHITE;
              }
              attributes.color = ColorGeometryInstanceAttribute.fromColor(currentColor);
          }
          if (defined(this._options.offsetAttribute)) {
              attributes.offset = OffsetGeometryInstanceAttribute.fromCartesian3(Property.getValueOrDefault(this._terrainOffsetProperty, time, defaultOffset, offsetScratch));
          }
  
          return new GeometryInstance({
              id : entity,
              geometry : BoxGeometry.fromDimensions(this._options),
              modelMatrix : entity.computeModelMatrixForHeightReference(time, entity.box.heightReference, this._options.dimensions.z * 0.5, this._scene.mapProjection.ellipsoid),
              attributes : attributes
          });
      };
  
      /**
       * Creates the geometry instance which represents the outline of the geometry.
       *
       * @param {JulianDate} time The time to use when retrieving initial attribute values.
       * @returns {GeometryInstance} The geometry instance representing the outline portion of the geometry.
       *
       * @exception {DeveloperError} This instance does not represent an outlined geometry.
       */
      BoxGeometryUpdater.prototype.createOutlineGeometryInstance = function(time) {
          //>>includeStart('debug', pragmas.debug);
          Check.defined('time', time);
  
          if (!this._outlineEnabled) {
              throw new DeveloperError('This instance does not represent an outlined geometry.');
          }
          //>>includeEnd('debug');
  
          var entity = this._entity;
          var isAvailable = entity.isAvailable(time);
          var outlineColor = Property.getValueOrDefault(this._outlineColorProperty, time, Color.BLACK, scratchColor);
          var distanceDisplayCondition = this._distanceDisplayConditionProperty.getValue(time);
  
          var attributes = {
              show : new ShowGeometryInstanceAttribute(isAvailable && entity.isShowing && this._showProperty.getValue(time) && this._showOutlineProperty.getValue(time)),
              color : ColorGeometryInstanceAttribute.fromColor(outlineColor),
              distanceDisplayCondition : DistanceDisplayConditionGeometryInstanceAttribute.fromDistanceDisplayCondition(distanceDisplayCondition),
              offset : undefined
          };
          if (defined(this._options.offsetAttribute)) {
              attributes.offset = OffsetGeometryInstanceAttribute.fromCartesian3(Property.getValueOrDefault(this._terrainOffsetProperty, time, defaultOffset, offsetScratch));
          }
  
          return new GeometryInstance({
              id : entity,
              geometry : BoxOutlineGeometry.fromDimensions(this._options),
              modelMatrix : entity.computeModelMatrixForHeightReference(time, entity.box.heightReference, this._options.dimensions.z * 0.5, this._scene.mapProjection.ellipsoid),
              attributes : attributes
          });
      };
  
      BoxGeometryUpdater.prototype._computeCenter = function(time, result) {
          return Property.getValueOrUndefined(this._entity.position, time, result);
      };
  
      BoxGeometryUpdater.prototype._isHidden = function(entity, box) {
          return !defined(box.dimensions) || !defined(entity.position) || GeometryUpdater.prototype._isHidden.call(this, entity, box);
      };
  
      BoxGeometryUpdater.prototype._isDynamic = function(entity, box) {
          return !entity.position.isConstant ||  !Property.isConstant(entity.orientation) ||  !box.dimensions.isConstant ||  !Property.isConstant(box.outlineWidth);
      };
  
      BoxGeometryUpdater.prototype._setStaticOptions = function(entity, box) {
          var heightReference = Property.getValueOrDefault(box.heightReference, Iso8601.MINIMUM_VALUE, HeightReference.NONE);
  
          var options = this._options;
          options.vertexFormat = this._materialProperty instanceof ColorMaterialProperty ? PerInstanceColorAppearance.VERTEX_FORMAT : MaterialAppearance.MaterialSupport.TEXTURED.vertexFormat;
          options.dimensions = box.dimensions.getValue(Iso8601.MINIMUM_VALUE, options.dimensions);
          options.offsetAttribute = heightReference !== HeightReference.NONE ? GeometryOffsetAttribute.ALL : undefined;
      };
  
      BoxGeometryUpdater.prototype._onEntityPropertyChanged = heightReferenceOnEntityPropertyChanged;
  
      BoxGeometryUpdater.DynamicGeometryUpdater = DynamicBoxGeometryUpdater;
  
      /**
       * @private
       */
      function DynamicBoxGeometryUpdater(geometryUpdater, primitives, groundPrimitives) {
          DynamicGeometryUpdater.call(this, geometryUpdater, primitives, groundPrimitives);
      }
  
      if (defined(Object.create)) {
          DynamicBoxGeometryUpdater.prototype = Object.create(DynamicGeometryUpdater.prototype);
          DynamicBoxGeometryUpdater.prototype.constructor = DynamicBoxGeometryUpdater;
      }
  
      DynamicBoxGeometryUpdater.prototype._isHidden = function(entity, box, time) {
          var position = Property.getValueOrUndefined(entity.position, time, positionScratch);
          var dimensions = this._options.dimensions;
          return !defined(position) || !defined(dimensions) || DynamicGeometryUpdater.prototype._isHidden.call(this, entity, box, time);
      };
  
      DynamicBoxGeometryUpdater.prototype._setOptions = function(entity, box, time) {
          var heightReference = Property.getValueOrDefault(box.heightReference, time, HeightReference.NONE);
          var options = this._options;
          options.dimensions = Property.getValueOrUndefined(box.dimensions, time, options.dimensions);
          options.offsetAttribute = heightReference !== HeightReference.NONE ? GeometryOffsetAttribute.ALL : undefined;
      };
  
      return BoxGeometryUpdater;
  });
  