import BoundingSphere from "../Core/BoundingSphere.js";
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import Cartesian3 from "../Core/Cartesian3.js";
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import Cartographic from "../Core/Cartographic.js";
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import Check from "../Core/Check.js";
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import ColorGeometryInstanceAttribute from "../Core/ColorGeometryInstanceAttribute.js";
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import defaultValue from "../Core/defaultValue.js";
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import defined from "../Core/defined.js";
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import Ellipsoid from "../Core/Ellipsoid.js";
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import GeometryInstance from "../Core/GeometryInstance.js";
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import IntersectionTests from "../Core/IntersectionTests.js";
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import Matrix4 from "../Core/Matrix4.js";
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import OrientedBoundingBox from "../Core/OrientedBoundingBox.js";
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import Plane from "../Core/Plane.js";
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import Ray from "../Core/Ray.js";
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import Rectangle from "../Core/Rectangle.js";
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import RectangleOutlineGeometry from "../Core/RectangleOutlineGeometry.js";
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import PerInstanceColorAppearance from "./PerInstanceColorAppearance.js";
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import Primitive from "./Primitive.js";
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import SceneMode from "./SceneMode.js";
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/**
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* A tile bounding volume specified as a longitude/latitude/height region.
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* @alias TileBoundingRegion
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* @constructor
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*
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* @param {Object} options Object with the following properties:
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* @param {Rectangle} options.rectangle The rectangle specifying the longitude and latitude range of the region.
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* @param {Number} [options.minimumHeight=0.0] The minimum height of the region.
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* @param {Number} [options.maximumHeight=0.0] The maximum height of the region.
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* @param {Ellipsoid} [options.ellipsoid=Cesium.Ellipsoid.WGS84] The ellipsoid.
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* @param {Boolean} [options.computeBoundingVolumes=true] True to compute the {@link TileBoundingRegion#boundingVolume} and
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* {@link TileBoundingVolume#boundingSphere}. If false, these properties will be undefined.
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*
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* @private
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*/
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function TileBoundingRegion(options) {
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//>>includeStart('debug', pragmas.debug);
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Check.typeOf.object("options", options);
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Check.typeOf.object("options.rectangle", options.rectangle);
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//>>includeEnd('debug');
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this.rectangle = Rectangle.clone(options.rectangle);
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this.minimumHeight = defaultValue(options.minimumHeight, 0.0);
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this.maximumHeight = defaultValue(options.maximumHeight, 0.0);
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/**
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* The world coordinates of the southwest corner of the tile's rectangle.
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*
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* @type {Cartesian3}
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* @default Cartesian3()
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*/
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this.southwestCornerCartesian = new Cartesian3();
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/**
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* The world coordinates of the northeast corner of the tile's rectangle.
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*
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* @type {Cartesian3}
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* @default Cartesian3()
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*/
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this.northeastCornerCartesian = new Cartesian3();
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/**
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* A normal that, along with southwestCornerCartesian, defines a plane at the western edge of
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* the tile. Any position above (in the direction of the normal) this plane is outside the tile.
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*
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* @type {Cartesian3}
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* @default Cartesian3()
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*/
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this.westNormal = new Cartesian3();
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/**
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* A normal that, along with southwestCornerCartesian, defines a plane at the southern edge of
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* the tile. Any position above (in the direction of the normal) this plane is outside the tile.
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* Because points of constant latitude do not necessary lie in a plane, positions below this
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* plane are not necessarily inside the tile, but they are close.
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*
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* @type {Cartesian3}
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* @default Cartesian3()
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*/
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this.southNormal = new Cartesian3();
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/**
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* A normal that, along with northeastCornerCartesian, defines a plane at the eastern edge of
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* the tile. Any position above (in the direction of the normal) this plane is outside the tile.
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*
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* @type {Cartesian3}
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* @default Cartesian3()
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*/
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this.eastNormal = new Cartesian3();
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/**
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* A normal that, along with northeastCornerCartesian, defines a plane at the eastern edge of
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* the tile. Any position above (in the direction of the normal) this plane is outside the tile.
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* Because points of constant latitude do not necessary lie in a plane, positions below this
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* plane are not necessarily inside the tile, but they are close.
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*
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* @type {Cartesian3}
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* @default Cartesian3()
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*/
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this.northNormal = new Cartesian3();
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var ellipsoid = defaultValue(options.ellipsoid, Ellipsoid.WGS84);
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computeBox(this, options.rectangle, ellipsoid);
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this._orientedBoundingBox = undefined;
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this._boundingSphere = undefined;
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if (defaultValue(options.computeBoundingVolumes, true)) {
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this.computeBoundingVolumes(ellipsoid);
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}
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}
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Object.defineProperties(TileBoundingRegion.prototype, {
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/**
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* The underlying bounding volume
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*
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* @memberof TileBoundingRegion.prototype
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*
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* @type {Object}
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* @readonly
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*/
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boundingVolume: {
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get: function () {
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return this._orientedBoundingBox;
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},
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},
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/**
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* The underlying bounding sphere
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*
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* @memberof TileBoundingRegion.prototype
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*
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* @type {BoundingSphere}
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* @readonly
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*/
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boundingSphere: {
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get: function () {
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return this._boundingSphere;
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},
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},
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});
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TileBoundingRegion.prototype.computeBoundingVolumes = function (ellipsoid) {
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// An oriented bounding box that encloses this tile's region. This is used to calculate tile visibility.
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this._orientedBoundingBox = OrientedBoundingBox.fromRectangle(
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this.rectangle,
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this.minimumHeight,
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this.maximumHeight,
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ellipsoid
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);
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this._boundingSphere = BoundingSphere.fromOrientedBoundingBox(
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this._orientedBoundingBox
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);
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};
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var cartesian3Scratch = new Cartesian3();
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var cartesian3Scratch2 = new Cartesian3();
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var cartesian3Scratch3 = new Cartesian3();
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var eastWestNormalScratch = new Cartesian3();
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var westernMidpointScratch = new Cartesian3();
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var easternMidpointScratch = new Cartesian3();
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var cartographicScratch = new Cartographic();
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var planeScratch = new Plane(Cartesian3.UNIT_X, 0.0);
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var rayScratch = new Ray();
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function computeBox(tileBB, rectangle, ellipsoid) {
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ellipsoid.cartographicToCartesian(
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Rectangle.southwest(rectangle),
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tileBB.southwestCornerCartesian
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);
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ellipsoid.cartographicToCartesian(
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Rectangle.northeast(rectangle),
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tileBB.northeastCornerCartesian
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);
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// The middle latitude on the western edge.
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cartographicScratch.longitude = rectangle.west;
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cartographicScratch.latitude = (rectangle.south + rectangle.north) * 0.5;
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cartographicScratch.height = 0.0;
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var westernMidpointCartesian = ellipsoid.cartographicToCartesian(
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cartographicScratch,
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westernMidpointScratch
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);
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// Compute the normal of the plane on the western edge of the tile.
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var westNormal = Cartesian3.cross(
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westernMidpointCartesian,
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Cartesian3.UNIT_Z,
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cartesian3Scratch
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);
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Cartesian3.normalize(westNormal, tileBB.westNormal);
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// The middle latitude on the eastern edge.
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cartographicScratch.longitude = rectangle.east;
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var easternMidpointCartesian = ellipsoid.cartographicToCartesian(
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cartographicScratch,
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easternMidpointScratch
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);
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// Compute the normal of the plane on the eastern edge of the tile.
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var eastNormal = Cartesian3.cross(
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Cartesian3.UNIT_Z,
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easternMidpointCartesian,
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cartesian3Scratch
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);
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Cartesian3.normalize(eastNormal, tileBB.eastNormal);
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// Compute the normal of the plane bounding the southern edge of the tile.
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var westVector = Cartesian3.subtract(
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westernMidpointCartesian,
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easternMidpointCartesian,
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cartesian3Scratch
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);
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var eastWestNormal = Cartesian3.normalize(westVector, eastWestNormalScratch);
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var south = rectangle.south;
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var southSurfaceNormal;
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if (south > 0.0) {
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// Compute a plane that doesn't cut through the tile.
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cartographicScratch.longitude = (rectangle.west + rectangle.east) * 0.5;
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cartographicScratch.latitude = south;
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var southCenterCartesian = ellipsoid.cartographicToCartesian(
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cartographicScratch,
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rayScratch.origin
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);
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Cartesian3.clone(eastWestNormal, rayScratch.direction);
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var westPlane = Plane.fromPointNormal(
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tileBB.southwestCornerCartesian,
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tileBB.westNormal,
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planeScratch
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);
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// Find a point that is on the west and the south planes
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IntersectionTests.rayPlane(
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rayScratch,
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westPlane,
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tileBB.southwestCornerCartesian
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);
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southSurfaceNormal = ellipsoid.geodeticSurfaceNormal(
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southCenterCartesian,
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cartesian3Scratch2
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);
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} else {
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southSurfaceNormal = ellipsoid.geodeticSurfaceNormalCartographic(
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Rectangle.southeast(rectangle),
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cartesian3Scratch2
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);
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}
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var southNormal = Cartesian3.cross(
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southSurfaceNormal,
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westVector,
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cartesian3Scratch3
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);
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Cartesian3.normalize(southNormal, tileBB.southNormal);
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// Compute the normal of the plane bounding the northern edge of the tile.
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var north = rectangle.north;
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var northSurfaceNormal;
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if (north < 0.0) {
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// Compute a plane that doesn't cut through the tile.
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cartographicScratch.longitude = (rectangle.west + rectangle.east) * 0.5;
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cartographicScratch.latitude = north;
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var northCenterCartesian = ellipsoid.cartographicToCartesian(
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cartographicScratch,
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rayScratch.origin
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);
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Cartesian3.negate(eastWestNormal, rayScratch.direction);
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var eastPlane = Plane.fromPointNormal(
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tileBB.northeastCornerCartesian,
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tileBB.eastNormal,
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planeScratch
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);
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// Find a point that is on the east and the north planes
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IntersectionTests.rayPlane(
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rayScratch,
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eastPlane,
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tileBB.northeastCornerCartesian
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);
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northSurfaceNormal = ellipsoid.geodeticSurfaceNormal(
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northCenterCartesian,
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cartesian3Scratch2
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);
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} else {
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northSurfaceNormal = ellipsoid.geodeticSurfaceNormalCartographic(
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Rectangle.northwest(rectangle),
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cartesian3Scratch2
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);
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}
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var northNormal = Cartesian3.cross(
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westVector,
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northSurfaceNormal,
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cartesian3Scratch3
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);
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Cartesian3.normalize(northNormal, tileBB.northNormal);
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}
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var southwestCornerScratch = new Cartesian3();
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var northeastCornerScratch = new Cartesian3();
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var negativeUnitY = new Cartesian3(0.0, -1.0, 0.0);
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var negativeUnitZ = new Cartesian3(0.0, 0.0, -1.0);
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var vectorScratch = new Cartesian3();
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function distanceToCameraRegion(tileBB, frameState) {
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var camera = frameState.camera;
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var cameraCartesianPosition = camera.positionWC;
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var cameraCartographicPosition = camera.positionCartographic;
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var result = 0.0;
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if (!Rectangle.contains(tileBB.rectangle, cameraCartographicPosition)) {
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var southwestCornerCartesian = tileBB.southwestCornerCartesian;
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var northeastCornerCartesian = tileBB.northeastCornerCartesian;
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var westNormal = tileBB.westNormal;
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var southNormal = tileBB.southNormal;
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var eastNormal = tileBB.eastNormal;
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var northNormal = tileBB.northNormal;
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if (frameState.mode !== SceneMode.SCENE3D) {
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southwestCornerCartesian = frameState.mapProjection.project(
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Rectangle.southwest(tileBB.rectangle),
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southwestCornerScratch
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);
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southwestCornerCartesian.z = southwestCornerCartesian.y;
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southwestCornerCartesian.y = southwestCornerCartesian.x;
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southwestCornerCartesian.x = 0.0;
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northeastCornerCartesian = frameState.mapProjection.project(
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Rectangle.northeast(tileBB.rectangle),
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northeastCornerScratch
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);
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northeastCornerCartesian.z = northeastCornerCartesian.y;
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northeastCornerCartesian.y = northeastCornerCartesian.x;
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northeastCornerCartesian.x = 0.0;
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westNormal = negativeUnitY;
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eastNormal = Cartesian3.UNIT_Y;
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southNormal = negativeUnitZ;
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northNormal = Cartesian3.UNIT_Z;
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}
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var vectorFromSouthwestCorner = Cartesian3.subtract(
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cameraCartesianPosition,
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southwestCornerCartesian,
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vectorScratch
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);
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var distanceToWestPlane = Cartesian3.dot(
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vectorFromSouthwestCorner,
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westNormal
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);
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var distanceToSouthPlane = Cartesian3.dot(
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vectorFromSouthwestCorner,
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southNormal
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);
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var vectorFromNortheastCorner = Cartesian3.subtract(
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cameraCartesianPosition,
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northeastCornerCartesian,
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vectorScratch
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);
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var distanceToEastPlane = Cartesian3.dot(
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vectorFromNortheastCorner,
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eastNormal
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);
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var distanceToNorthPlane = Cartesian3.dot(
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vectorFromNortheastCorner,
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northNormal
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);
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if (distanceToWestPlane > 0.0) {
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result += distanceToWestPlane * distanceToWestPlane;
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} else if (distanceToEastPlane > 0.0) {
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result += distanceToEastPlane * distanceToEastPlane;
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}
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if (distanceToSouthPlane > 0.0) {
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result += distanceToSouthPlane * distanceToSouthPlane;
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} else if (distanceToNorthPlane > 0.0) {
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result += distanceToNorthPlane * distanceToNorthPlane;
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}
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}
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var cameraHeight;
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var minimumHeight;
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var maximumHeight;
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if (frameState.mode === SceneMode.SCENE3D) {
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cameraHeight = cameraCartographicPosition.height;
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minimumHeight = tileBB.minimumHeight;
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maximumHeight = tileBB.maximumHeight;
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} else {
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cameraHeight = cameraCartesianPosition.x;
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minimumHeight = 0.0;
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maximumHeight = 0.0;
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}
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if (cameraHeight > maximumHeight) {
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var distanceAboveTop = cameraHeight - maximumHeight;
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result += distanceAboveTop * distanceAboveTop;
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} else if (cameraHeight < minimumHeight) {
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var distanceBelowBottom = minimumHeight - cameraHeight;
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result += distanceBelowBottom * distanceBelowBottom;
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}
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return Math.sqrt(result);
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}
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/**
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* Gets the distance from the camera to the closest point on the tile. This is used for level of detail selection.
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*
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* @param {FrameState} frameState The state information of the current rendering frame.
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* @returns {Number} The distance from the camera to the closest point on the tile, in meters.
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*/
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TileBoundingRegion.prototype.distanceToCamera = function (frameState) {
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//>>includeStart('debug', pragmas.debug);
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Check.defined("frameState", frameState);
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//>>includeEnd('debug');
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var regionResult = distanceToCameraRegion(this, frameState);
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if (
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frameState.mode === SceneMode.SCENE3D &&
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defined(this._orientedBoundingBox)
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) {
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var obbResult = Math.sqrt(
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this._orientedBoundingBox.distanceSquaredTo(frameState.camera.positionWC)
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);
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return Math.max(regionResult, obbResult);
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}
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return regionResult;
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};
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/**
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* Determines which side of a plane this box is located.
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*
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* @param {Plane} plane The plane to test against.
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* @returns {Intersect} {@link Intersect.INSIDE} if the entire box is on the side of the plane
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* the normal is pointing, {@link Intersect.OUTSIDE} if the entire box is
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* on the opposite side, and {@link Intersect.INTERSECTING} if the box
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* intersects the plane.
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*/
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TileBoundingRegion.prototype.intersectPlane = function (plane) {
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//>>includeStart('debug', pragmas.debug);
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Check.defined("plane", plane);
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//>>includeEnd('debug');
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return this._orientedBoundingBox.intersectPlane(plane);
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};
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/**
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* Creates a debug primitive that shows the outline of the tile bounding region.
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*
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* @param {Color} color The desired color of the primitive's mesh
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* @return {Primitive}
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*
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* @private
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*/
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TileBoundingRegion.prototype.createDebugVolume = function (color) {
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//>>includeStart('debug', pragmas.debug);
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Check.defined("color", color);
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//>>includeEnd('debug');
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var modelMatrix = new Matrix4.clone(Matrix4.IDENTITY);
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var geometry = new RectangleOutlineGeometry({
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rectangle: this.rectangle,
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height: this.minimumHeight,
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extrudedHeight: this.maximumHeight,
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});
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var instance = new GeometryInstance({
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geometry: geometry,
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id: "outline",
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modelMatrix: modelMatrix,
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attributes: {
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color: ColorGeometryInstanceAttribute.fromColor(color),
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},
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});
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return new Primitive({
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geometryInstances: instance,
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appearance: new PerInstanceColorAppearance({
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translucent: false,
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flat: true,
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}),
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asynchronous: false,
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});
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};
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export default TileBoundingRegion;
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