yclw/public/static/Build/Cesium/Workers/BoxGeometry-33cd41d7.js

/**
 * Cesium - https://github.com/CesiumGS/cesium
 *
 * Copyright 2011-2020 Cesium Contributors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * Columbus View (Pat. Pend.)
 *
 * Portions licensed separately.
 * See https://github.com/CesiumGS/cesium/blob/master/LICENSE.md for full licensing details.
 */
define(['exports', './when-8d13db60', './Check-70bec281', './Cartographic-fe4be337', './arrayFill-9766fb2e', './BoundingSphere-8f8a682c', './ComponentDatatype-5862616f', './GeometryAttribute-ed9d707f', './PrimitiveType-97893bc7', './GeometryAttributes-aacecde6', './GeometryOffsetAttribute-999fc023', './VertexFormat-fe4db402'], function (exports, when, Check, Cartographic, arrayFill, BoundingSphere, ComponentDatatype, GeometryAttribute, PrimitiveType, GeometryAttributes, GeometryOffsetAttribute, VertexFormat) { 'use strict';

    var diffScratch = new Cartographic.Cartesian3();

        /**
         * Describes a cube centered at the origin.
         *
         * @alias BoxGeometry
         * @constructor
         *
         * @param {Object} options Object with the following properties:
         * @param {Cartesian3} options.minimum The minimum x, y, and z coordinates of the box.
         * @param {Cartesian3} options.maximum The maximum x, y, and z coordinates of the box.
         * @param {VertexFormat} [options.vertexFormat=VertexFormat.DEFAULT] The vertex attributes to be computed.
         *
         * @see BoxGeometry.fromDimensions
         * @see BoxGeometry.createGeometry
         * @see Packable
         *
         * @demo {@link https://sandcastle.cesium.com/index.html?src=Box.html|Cesium Sandcastle Box Demo}
         *
         * @example
         * var box = new Cesium.BoxGeometry({
         *   vertexFormat : Cesium.VertexFormat.POSITION_ONLY,
         *   maximum : new Cesium.Cartesian3(250000.0, 250000.0, 250000.0),
         *   minimum : new Cesium.Cartesian3(-250000.0, -250000.0, -250000.0)
         * });
         * var geometry = Cesium.BoxGeometry.createGeometry(box);
         */
        function BoxGeometry(options) {
            options = when.defaultValue(options, when.defaultValue.EMPTY_OBJECT);

            var min = options.minimum;
            var max = options.maximum;

            //>>includeStart('debug', pragmas.debug);
            Check.Check.typeOf.object('min', min);
            Check.Check.typeOf.object('max', max);
            if (when.defined(options.offsetAttribute) && options.offsetAttribute === GeometryOffsetAttribute.GeometryOffsetAttribute.TOP) {
                throw new Check.DeveloperError('GeometryOffsetAttribute.TOP is not a supported options.offsetAttribute for this geometry.');
            }
            //>>includeEnd('debug');

            var vertexFormat = when.defaultValue(options.vertexFormat, VertexFormat.VertexFormat.DEFAULT);

            this._minimum = Cartographic.Cartesian3.clone(min);
            this._maximum = Cartographic.Cartesian3.clone(max);
            this._vertexFormat = vertexFormat;
            this._offsetAttribute = options.offsetAttribute;
            this._workerName = 'createBoxGeometry';
        }

        /**
         * Creates a cube centered at the origin given its dimensions.
         *
         * @param {Object} options Object with the following properties:
         * @param {Cartesian3} options.dimensions The width, depth, and height of the box stored in the x, y, and z coordinates of the <code>Cartesian3</code>, respectively.
         * @param {VertexFormat} [options.vertexFormat=VertexFormat.DEFAULT] The vertex attributes to be computed.
         * @returns {BoxGeometry}
         *
         * @exception {DeveloperError} All dimensions components must be greater than or equal to zero.
         *
         *
         * @example
         * var box = Cesium.BoxGeometry.fromDimensions({
         *   vertexFormat : Cesium.VertexFormat.POSITION_ONLY,
         *   dimensions : new Cesium.Cartesian3(500000.0, 500000.0, 500000.0)
         * });
         * var geometry = Cesium.BoxGeometry.createGeometry(box);
         *
         * @see BoxGeometry.createGeometry
         */
        BoxGeometry.fromDimensions = function(options) {
            options = when.defaultValue(options, when.defaultValue.EMPTY_OBJECT);
            var dimensions = options.dimensions;

            //>>includeStart('debug', pragmas.debug);
            Check.Check.typeOf.object('dimensions', dimensions);
            Check.Check.typeOf.number.greaterThanOrEquals('dimensions.x', dimensions.x, 0);
            Check.Check.typeOf.number.greaterThanOrEquals('dimensions.y', dimensions.y, 0);
            Check.Check.typeOf.number.greaterThanOrEquals('dimensions.z', dimensions.z, 0);
            //>>includeEnd('debug');

            var corner = Cartographic.Cartesian3.multiplyByScalar(dimensions, 0.5, new Cartographic.Cartesian3());

            return new BoxGeometry({
                minimum : Cartographic.Cartesian3.negate(corner, new Cartographic.Cartesian3()),
                maximum : corner,
                vertexFormat : options.vertexFormat,
                offsetAttribute: options.offsetAttribute
            });
        };

        /**
         * Creates a cube from the dimensions of an AxisAlignedBoundingBox.
         *
         * @param {AxisAlignedBoundingBox} boundingBox A description of the AxisAlignedBoundingBox.
         * @returns {BoxGeometry}
         *
         *
         *
         * @example
         * var aabb = Cesium.AxisAlignedBoundingBox.fromPoints(Cesium.Cartesian3.fromDegreesArray([
         *      -72.0, 40.0,
         *      -70.0, 35.0,
         *      -75.0, 30.0,
         *      -70.0, 30.0,
         *      -68.0, 40.0
         * ]));
         * var box = Cesium.BoxGeometry.fromAxisAlignedBoundingBox(aabb);
         *
         * @see BoxGeometry.createGeometry
         */
        BoxGeometry.fromAxisAlignedBoundingBox = function (boundingBox) {
            //>>includeStart('debug', pragmas.debug);
            Check.Check.typeOf.object('boundingBox', boundingBox);
            //>>includeEnd('debug');

            return new BoxGeometry({
                minimum : boundingBox.minimum,
                maximum : boundingBox.maximum
            });
        };

        /**
         * The number of elements used to pack the object into an array.
         * @type {Number}
         */
        BoxGeometry.packedLength = 2 * Cartographic.Cartesian3.packedLength + VertexFormat.VertexFormat.packedLength + 1;

        /**
         * Stores the provided instance into the provided array.
         *
         * @param {BoxGeometry} value The value to pack.
         * @param {Number[]} array The array to pack into.
         * @param {Number} [startingIndex=0] The index into the array at which to start packing the elements.
         *
         * @returns {Number[]} The array that was packed into
         */
        BoxGeometry.pack = function(value, array, startingIndex) {
            //>>includeStart('debug', pragmas.debug);
            Check.Check.typeOf.object('value', value);
            Check.Check.defined('array', array);
            //>>includeEnd('debug');

            startingIndex = when.defaultValue(startingIndex, 0);

            Cartographic.Cartesian3.pack(value._minimum, array, startingIndex);
            Cartographic.Cartesian3.pack(value._maximum, array, startingIndex + Cartographic.Cartesian3.packedLength);
            VertexFormat.VertexFormat.pack(value._vertexFormat, array, startingIndex + 2 * Cartographic.Cartesian3.packedLength);
            array[startingIndex + 2 * Cartographic.Cartesian3.packedLength + VertexFormat.VertexFormat.packedLength] = when.defaultValue(value._offsetAttribute, -1);

            return array;
        };

        var scratchMin = new Cartographic.Cartesian3();
        var scratchMax = new Cartographic.Cartesian3();
        var scratchVertexFormat = new VertexFormat.VertexFormat();
        var scratchOptions = {
            minimum: scratchMin,
            maximum: scratchMax,
            vertexFormat: scratchVertexFormat,
            offsetAttribute : undefined
        };

        /**
         * Retrieves an instance from a packed array.
         *
         * @param {Number[]} array The packed array.
         * @param {Number} [startingIndex=0] The starting index of the element to be unpacked.
         * @param {BoxGeometry} [result] The object into which to store the result.
         * @returns {BoxGeometry} The modified result parameter or a new BoxGeometry instance if one was not provided.
         */
        BoxGeometry.unpack = function(array, startingIndex, result) {
            //>>includeStart('debug', pragmas.debug);
            Check.Check.defined('array', array);
            //>>includeEnd('debug');

            startingIndex = when.defaultValue(startingIndex, 0);

            var min = Cartographic.Cartesian3.unpack(array, startingIndex, scratchMin);
            var max = Cartographic.Cartesian3.unpack(array, startingIndex + Cartographic.Cartesian3.packedLength, scratchMax);
            var vertexFormat = VertexFormat.VertexFormat.unpack(array, startingIndex + 2 * Cartographic.Cartesian3.packedLength, scratchVertexFormat);
            var offsetAttribute = array[startingIndex + 2 * Cartographic.Cartesian3.packedLength + VertexFormat.VertexFormat.packedLength];

            if (!when.defined(result)) {
                scratchOptions.offsetAttribute = offsetAttribute === -1 ? undefined : offsetAttribute;
                return new BoxGeometry(scratchOptions);
            }

            result._minimum = Cartographic.Cartesian3.clone(min, result._minimum);
            result._maximum = Cartographic.Cartesian3.clone(max, result._maximum);
            result._vertexFormat = VertexFormat.VertexFormat.clone(vertexFormat, result._vertexFormat);
            result._offsetAttribute = offsetAttribute === -1 ? undefined : offsetAttribute;

            return result;
        };

        /**
         * Computes the geometric representation of a box, including its vertices, indices, and a bounding sphere.
         *
         * @param {BoxGeometry} boxGeometry A description of the box.
         * @returns {Geometry|undefined} The computed vertices and indices.
         */
        BoxGeometry.createGeometry = function(boxGeometry) {
            var min = boxGeometry._minimum;
            var max = boxGeometry._maximum;
            var vertexFormat = boxGeometry._vertexFormat;

            if (Cartographic.Cartesian3.equals(min, max)) {
                return;
            }

            var attributes = new GeometryAttributes.GeometryAttributes();
            var indices;
            var positions;

            if (vertexFormat.position &&
                    (vertexFormat.st || vertexFormat.normal || vertexFormat.tangent || vertexFormat.bitangent)) {
                if (vertexFormat.position) {
                    // 8 corner points.  Duplicated 3 times each for each incident edge/face.
                    positions = new Float64Array(6 * 4 * 3);

                    // +z face
                    positions[0]  = min.x;
                    positions[1]  = min.y;
                    positions[2]  = max.z;
                    positions[3]  = max.x;
                    positions[4]  = min.y;
                    positions[5]  = max.z;
                    positions[6]  = max.x;
                    positions[7]  = max.y;
                    positions[8]  = max.z;
                    positions[9]  = min.x;
                    positions[10] = max.y;
                    positions[11] = max.z;

                    // -z face
                    positions[12] = min.x;
                    positions[13] = min.y;
                    positions[14] = min.z;
                    positions[15] = max.x;
                    positions[16] = min.y;
                    positions[17] = min.z;
                    positions[18] = max.x;
                    positions[19] = max.y;
                    positions[20] = min.z;
                    positions[21] = min.x;
                    positions[22] = max.y;
                    positions[23] = min.z;

                    // +x face
                    positions[24] = max.x;
                    positions[25] = min.y;
                    positions[26] = min.z;
                    positions[27] = max.x;
                    positions[28] = max.y;
                    positions[29] = min.z;
                    positions[30] = max.x;
                    positions[31] = max.y;
                    positions[32] = max.z;
                    positions[33] = max.x;
                    positions[34] = min.y;
                    positions[35] = max.z;

                    // -x face
                    positions[36] = min.x;
                    positions[37] = min.y;
                    positions[38] = min.z;
                    positions[39] = min.x;
                    positions[40] = max.y;
                    positions[41] = min.z;
                    positions[42] = min.x;
                    positions[43] = max.y;
                    positions[44] = max.z;
                    positions[45] = min.x;
                    positions[46] = min.y;
                    positions[47] = max.z;

                    // +y face
                    positions[48] = min.x;
                    positions[49] = max.y;
                    positions[50] = min.z;
                    positions[51] = max.x;
                    positions[52] = max.y;
                    positions[53] = min.z;
                    positions[54] = max.x;
                    positions[55] = max.y;
                    positions[56] = max.z;
                    positions[57] = min.x;
                    positions[58] = max.y;
                    positions[59] = max.z;

                    // -y face
                    positions[60] = min.x;
                    positions[61] = min.y;
                    positions[62] = min.z;
                    positions[63] = max.x;
                    positions[64] = min.y;
                    positions[65] = min.z;
                    positions[66] = max.x;
                    positions[67] = min.y;
                    positions[68] = max.z;
                    positions[69] = min.x;
                    positions[70] = min.y;
                    positions[71] = max.z;

                    attributes.position = new GeometryAttribute.GeometryAttribute({
                        componentDatatype : ComponentDatatype.ComponentDatatype.DOUBLE,
                        componentsPerAttribute : 3,
                        values : positions
                    });
                }

                if (vertexFormat.normal) {
                    var normals = new Float32Array(6 * 4 * 3);

                    // +z face
                    normals[0]  = 0.0;
                    normals[1]  = 0.0;
                    normals[2]  = 1.0;
                    normals[3]  = 0.0;
                    normals[4]  = 0.0;
                    normals[5]  = 1.0;
                    normals[6]  = 0.0;
                    normals[7]  = 0.0;
                    normals[8]  = 1.0;
                    normals[9]  = 0.0;
                    normals[10] = 0.0;
                    normals[11] = 1.0;

                    // -z face
                    normals[12] = 0.0;
                    normals[13] = 0.0;
                    normals[14] = -1.0;
                    normals[15] = 0.0;
                    normals[16] = 0.0;
                    normals[17] = -1.0;
                    normals[18] = 0.0;
                    normals[19] = 0.0;
                    normals[20] = -1.0;
                    normals[21] = 0.0;
                    normals[22] = 0.0;
                    normals[23] = -1.0;

                    // +x face
                    normals[24] = 1.0;
                    normals[25] = 0.0;
                    normals[26] = 0.0;
                    normals[27] = 1.0;
                    normals[28] = 0.0;
                    normals[29] = 0.0;
                    normals[30] = 1.0;
                    normals[31] = 0.0;
                    normals[32] = 0.0;
                    normals[33] = 1.0;
                    normals[34] = 0.0;
                    normals[35] = 0.0;

                    // -x face
                    normals[36] = -1.0;
                    normals[37] = 0.0;
                    normals[38] = 0.0;
                    normals[39] = -1.0;
                    normals[40] = 0.0;
                    normals[41] = 0.0;
                    normals[42] = -1.0;
                    normals[43] = 0.0;
                    normals[44] = 0.0;
                    normals[45] = -1.0;
                    normals[46] = 0.0;
                    normals[47] = 0.0;

                    // +y face
                    normals[48] = 0.0;
                    normals[49] = 1.0;
                    normals[50] = 0.0;
                    normals[51] = 0.0;
                    normals[52] = 1.0;
                    normals[53] = 0.0;
                    normals[54] = 0.0;
                    normals[55] = 1.0;
                    normals[56] = 0.0;
                    normals[57] = 0.0;
                    normals[58] = 1.0;
                    normals[59] = 0.0;

                    // -y face
                    normals[60] = 0.0;
                    normals[61] = -1.0;
                    normals[62] = 0.0;
                    normals[63] = 0.0;
                    normals[64] = -1.0;
                    normals[65] = 0.0;
                    normals[66] = 0.0;
                    normals[67] = -1.0;
                    normals[68] = 0.0;
                    normals[69] = 0.0;
                    normals[70] = -1.0;
                    normals[71] = 0.0;

                    attributes.normal = new GeometryAttribute.GeometryAttribute({
                        componentDatatype : ComponentDatatype.ComponentDatatype.FLOAT,
                        componentsPerAttribute : 3,
                        values : normals
                    });
                }

                if (vertexFormat.st) {
                    // 纹理坐标多用一位存储顶点数据哪个面，BOX剖面分析贴纹理需要用
                    var texCoords = new Float32Array(6 * 4 * 3);
                    var texValueIndex = 0;
                    // +z face
                    texCoords[texValueIndex++]  = 0.0;
                    texCoords[texValueIndex++]  = 0.0;
                    texCoords[texValueIndex++]  = -1.0;

                    texCoords[texValueIndex++]  = 1.0;
                    texCoords[texValueIndex++]  = 0.0;
                    texCoords[texValueIndex++]  = -1.0;

                    texCoords[texValueIndex++]  = 1.0;
                    texCoords[texValueIndex++]  = 1.0;
                    texCoords[texValueIndex++]  = -1.0;

                    texCoords[texValueIndex++]  = 0.0;
                    texCoords[texValueIndex++]  = 1.0;
                    texCoords[texValueIndex++]  = -1.0;

                    // -z face
                    texCoords[texValueIndex++]  = 1.0;
                    texCoords[texValueIndex++]  = 0.0;
                    texCoords[texValueIndex++]  = -1.0;

                    texCoords[texValueIndex++] = 0.0;
                    texCoords[texValueIndex++] = 0.0;
                    texCoords[texValueIndex++]  = -1.0;

                    texCoords[texValueIndex++] = 0.0;
                    texCoords[texValueIndex++] = 1.0;
                    texCoords[texValueIndex++]  = -1.0;

                    texCoords[texValueIndex++] = 1.0;
                    texCoords[texValueIndex++] = 1.0;
                    texCoords[texValueIndex++]  = -1.0;

                    //+x face
                    texCoords[texValueIndex++] = 0.0;
                    texCoords[texValueIndex++] = 0.0;
                    texCoords[texValueIndex++] = 0.0;

                    texCoords[texValueIndex++] = 1.0;
                    texCoords[texValueIndex++] = 0.0;
                    texCoords[texValueIndex++] = 0.0;

                    texCoords[texValueIndex++] = 1.0;
                    texCoords[texValueIndex++] = 1.0;
                    texCoords[texValueIndex++] = 0.0;

                    texCoords[texValueIndex++] = 0.0;
                    texCoords[texValueIndex++] = 1.0;
                    texCoords[texValueIndex++] = 0.0;

                    // -x face
                    texCoords[texValueIndex++] = 1.0;
                    texCoords[texValueIndex++] = 0.0;
                    texCoords[texValueIndex++] = 0.0;

                    texCoords[texValueIndex++] = 0.0;
                    texCoords[texValueIndex++] = 0.0;
                    texCoords[texValueIndex++] = 0.0;

                    texCoords[texValueIndex++] = 0.0;
                    texCoords[texValueIndex++] = 1.0;
                    texCoords[texValueIndex++] = 0.0;

                    texCoords[texValueIndex++] = 1.0;
                    texCoords[texValueIndex++] = 1.0;
                    texCoords[texValueIndex++] = 0.0;

                    // +y face
                    texCoords[texValueIndex++] = 1.0;
                    texCoords[texValueIndex++] = 0.0;
                    texCoords[texValueIndex++] = 1.0;

                    texCoords[texValueIndex++] = 0.0;
                    texCoords[texValueIndex++] = 0.0;
                    texCoords[texValueIndex++] = 1.0;

                    texCoords[texValueIndex++] = 0.0;
                    texCoords[texValueIndex++] = 1.0;
                    texCoords[texValueIndex++] = 1.0;

                    texCoords[texValueIndex++] = 1.0;
                    texCoords[texValueIndex++] = 1.0;
                    texCoords[texValueIndex++] = 1.0;

                    // -y face
                    texCoords[texValueIndex++] = 0.0;
                    texCoords[texValueIndex++] = 0.0;
                    texCoords[texValueIndex++] = 1.0;

                    texCoords[texValueIndex++] = 1.0;
                    texCoords[texValueIndex++] = 0.0;
                    texCoords[texValueIndex++] = 1.0;

                    texCoords[texValueIndex++] = 1.0;
                    texCoords[texValueIndex++] = 1.0;
                    texCoords[texValueIndex++] = 1.0;

                    texCoords[texValueIndex++] = 0.0;
                    texCoords[texValueIndex++] = 1.0;
                    texCoords[texValueIndex++] = 1.0;

                    attributes.st = new GeometryAttribute.GeometryAttribute({
                        componentDatatype : ComponentDatatype.ComponentDatatype.FLOAT,
                        componentsPerAttribute : 3,
                        values : texCoords
                    });
                }

                if (vertexFormat.tangent) {
                    var tangents = new Float32Array(6 * 4 * 3);

                    // +z face
                    tangents[0]  = 1.0;
                    tangents[1]  = 0.0;
                    tangents[2]  = 0.0;
                    tangents[3]  = 1.0;
                    tangents[4]  = 0.0;
                    tangents[5]  = 0.0;
                    tangents[6]  = 1.0;
                    tangents[7]  = 0.0;
                    tangents[8]  = 0.0;
                    tangents[9]  = 1.0;
                    tangents[10] = 0.0;
                    tangents[11] = 0.0;

                    // -z face
                    tangents[12] = -1.0;
                    tangents[13] = 0.0;
                    tangents[14] = 0.0;
                    tangents[15] = -1.0;
                    tangents[16] = 0.0;
                    tangents[17] = 0.0;
                    tangents[18] = -1.0;
                    tangents[19] = 0.0;
                    tangents[20] = 0.0;
                    tangents[21] = -1.0;
                    tangents[22] = 0.0;
                    tangents[23] = 0.0;

                    // +x face
                    tangents[24] = 0.0;
                    tangents[25] = 1.0;
                    tangents[26] = 0.0;
                    tangents[27] = 0.0;
                    tangents[28] = 1.0;
                    tangents[29] = 0.0;
                    tangents[30] = 0.0;
                    tangents[31] = 1.0;
                    tangents[32] = 0.0;
                    tangents[33] = 0.0;
                    tangents[34] = 1.0;
                    tangents[35] = 0.0;

                    // -x face
                    tangents[36] = 0.0;
                    tangents[37] = -1.0;
                    tangents[38] = 0.0;
                    tangents[39] = 0.0;
                    tangents[40] = -1.0;
                    tangents[41] = 0.0;
                    tangents[42] = 0.0;
                    tangents[43] = -1.0;
                    tangents[44] = 0.0;
                    tangents[45] = 0.0;
                    tangents[46] = -1.0;
                    tangents[47] = 0.0;

                    // +y face
                    tangents[48] = -1.0;
                    tangents[49] = 0.0;
                    tangents[50] = 0.0;
                    tangents[51] = -1.0;
                    tangents[52] = 0.0;
                    tangents[53] = 0.0;
                    tangents[54] = -1.0;
                    tangents[55] = 0.0;
                    tangents[56] = 0.0;
                    tangents[57] = -1.0;
                    tangents[58] = 0.0;
                    tangents[59] = 0.0;

                    // -y face
                    tangents[60] = 1.0;
                    tangents[61] = 0.0;
                    tangents[62] = 0.0;
                    tangents[63] = 1.0;
                    tangents[64] = 0.0;
                    tangents[65] = 0.0;
                    tangents[66] = 1.0;
                    tangents[67] = 0.0;
                    tangents[68] = 0.0;
                    tangents[69] = 1.0;
                    tangents[70] = 0.0;
                    tangents[71] = 0.0;

                    attributes.tangent = new GeometryAttribute.GeometryAttribute({
                        componentDatatype : ComponentDatatype.ComponentDatatype.FLOAT,
                        componentsPerAttribute : 3,
                        values : tangents
                    });
                }

                if (vertexFormat.bitangent) {
                    var bitangents = new Float32Array(6 * 4 * 3);

                    // +z face
                    bitangents[0] = 0.0;
                    bitangents[1] = 1.0;
                    bitangents[2] = 0.0;
                    bitangents[3] = 0.0;
                    bitangents[4] = 1.0;
                    bitangents[5] = 0.0;
                    bitangents[6] = 0.0;
                    bitangents[7] = 1.0;
                    bitangents[8] = 0.0;
                    bitangents[9] = 0.0;
                    bitangents[10] = 1.0;
                    bitangents[11] = 0.0;

                    // -z face
                    bitangents[12] = 0.0;
                    bitangents[13] = 1.0;
                    bitangents[14] = 0.0;
                    bitangents[15] = 0.0;
                    bitangents[16] = 1.0;
                    bitangents[17] = 0.0;
                    bitangents[18] = 0.0;
                    bitangents[19] = 1.0;
                    bitangents[20] = 0.0;
                    bitangents[21] = 0.0;
                    bitangents[22] = 1.0;
                    bitangents[23] = 0.0;

                    // +x face
                    bitangents[24] = 0.0;
                    bitangents[25] = 0.0;
                    bitangents[26] = 1.0;
                    bitangents[27] = 0.0;
                    bitangents[28] = 0.0;
                    bitangents[29] = 1.0;
                    bitangents[30] = 0.0;
                    bitangents[31] = 0.0;
                    bitangents[32] = 1.0;
                    bitangents[33] = 0.0;
                    bitangents[34] = 0.0;
                    bitangents[35] = 1.0;

                    // -x face
                    bitangents[36] = 0.0;
                    bitangents[37] = 0.0;
                    bitangents[38] = 1.0;
                    bitangents[39] = 0.0;
                    bitangents[40] = 0.0;
                    bitangents[41] = 1.0;
                    bitangents[42] = 0.0;
                    bitangents[43] = 0.0;
                    bitangents[44] = 1.0;
                    bitangents[45] = 0.0;
                    bitangents[46] = 0.0;
                    bitangents[47] = 1.0;

                    // +y face
                    bitangents[48] = 0.0;
                    bitangents[49] = 0.0;
                    bitangents[50] = 1.0;
                    bitangents[51] = 0.0;
                    bitangents[52] = 0.0;
                    bitangents[53] = 1.0;
                    bitangents[54] = 0.0;
                    bitangents[55] = 0.0;
                    bitangents[56] = 1.0;
                    bitangents[57] = 0.0;
                    bitangents[58] = 0.0;
                    bitangents[59] = 1.0;

                    // -y face
                    bitangents[60] = 0.0;
                    bitangents[61] = 0.0;
                    bitangents[62] = 1.0;
                    bitangents[63] = 0.0;
                    bitangents[64] = 0.0;
                    bitangents[65] = 1.0;
                    bitangents[66] = 0.0;
                    bitangents[67] = 0.0;
                    bitangents[68] = 1.0;
                    bitangents[69] = 0.0;
                    bitangents[70] = 0.0;
                    bitangents[71] = 1.0;

                    attributes.bitangent = new GeometryAttribute.GeometryAttribute({
                        componentDatatype : ComponentDatatype.ComponentDatatype.FLOAT,
                        componentsPerAttribute : 3,
                        values : bitangents
                    });
                }

                // 12 triangles:  6 faces, 2 triangles each.
                indices = new Uint16Array(6 * 2 * 3);

                // +z face
                indices[0] = 0;
                indices[1] = 1;
                indices[2] = 2;
                indices[3] = 0;
                indices[4] = 2;
                indices[5] = 3;

                // -z face
                indices[6] = 4 + 2;
                indices[7] = 4 + 1;
                indices[8] = 4 + 0;
                indices[9] = 4 + 3;
                indices[10] = 4 + 2;
                indices[11] = 4 + 0;

                // +x face
                indices[12] = 8 + 0;
                indices[13] = 8 + 1;
                indices[14] = 8 + 2;
                indices[15] = 8 + 0;
                indices[16] = 8 + 2;
                indices[17] = 8 + 3;

                // -x face
                indices[18] = 12 + 2;
                indices[19] = 12 + 1;
                indices[20] = 12 + 0;
                indices[21] = 12 + 3;
                indices[22] = 12 + 2;
                indices[23] = 12 + 0;

                // +y face
                indices[24] = 16 + 2;
                indices[25] = 16 + 1;
                indices[26] = 16 + 0;
                indices[27] = 16 + 3;
                indices[28] = 16 + 2;
                indices[29] = 16 + 0;

                // -y face
                indices[30] = 20 + 0;
                indices[31] = 20 + 1;
                indices[32] = 20 + 2;
                indices[33] = 20 + 0;
                indices[34] = 20 + 2;
                indices[35] = 20 + 3;
            } else {
                // Positions only - no need to duplicate corner points
                positions = new Float64Array(8 * 3);

                positions[0] = min.x;
                positions[1] = min.y;
                positions[2] = min.z;
                positions[3] = max.x;
                positions[4] = min.y;
                positions[5] = min.z;
                positions[6] = max.x;
                positions[7] = max.y;
                positions[8] = min.z;
                positions[9] = min.x;
                positions[10] = max.y;
                positions[11] = min.z;
                positions[12] = min.x;
                positions[13] = min.y;
                positions[14] = max.z;
                positions[15] = max.x;
                positions[16] = min.y;
                positions[17] = max.z;
                positions[18] = max.x;
                positions[19] = max.y;
                positions[20] = max.z;
                positions[21] = min.x;
                positions[22] = max.y;
                positions[23] = max.z;

                attributes.position = new GeometryAttribute.GeometryAttribute({
                    componentDatatype : ComponentDatatype.ComponentDatatype.DOUBLE,
                    componentsPerAttribute : 3,
                    values : positions
                });

                // 12 triangles:  6 faces, 2 triangles each.
                indices = new Uint16Array(6 * 2 * 3);

                // plane z = corner.Z
                indices[0] = 4;
                indices[1] = 5;
                indices[2] = 6;
                indices[3] = 4;
                indices[4] = 6;
                indices[5] = 7;

                // plane z = -corner.Z
                indices[6] = 1;
                indices[7] = 0;
                indices[8] = 3;
                indices[9] = 1;
                indices[10] = 3;
                indices[11] = 2;

                // plane x = corner.X
                indices[12] = 1;
                indices[13] = 6;
                indices[14] = 5;
                indices[15] = 1;
                indices[16] = 2;
                indices[17] = 6;

                // plane y = corner.Y
                indices[18] = 2;
                indices[19] = 3;
                indices[20] = 7;
                indices[21] = 2;
                indices[22] = 7;
                indices[23] = 6;

                // plane x = -corner.X
                indices[24] = 3;
                indices[25] = 0;
                indices[26] = 4;
                indices[27] = 3;
                indices[28] = 4;
                indices[29] = 7;

                // plane y = -corner.Y
                indices[30] = 0;
                indices[31] = 1;
                indices[32] = 5;
                indices[33] = 0;
                indices[34] = 5;
                indices[35] = 4;
            }

            var diff = Cartographic.Cartesian3.subtract(max, min, diffScratch);
            var radius = Cartographic.Cartesian3.magnitude(diff) * 0.5;

            if (when.defined(boxGeometry._offsetAttribute)) {
                var length = positions.length;
                var applyOffset = new Uint8Array(length / 3);
                var offsetValue = boxGeometry._offsetAttribute === GeometryOffsetAttribute.GeometryOffsetAttribute.NONE ? 0 : 1;
                arrayFill.arrayFill(applyOffset, offsetValue);
                attributes.applyOffset = new GeometryAttribute.GeometryAttribute({
                    componentDatatype : ComponentDatatype.ComponentDatatype.UNSIGNED_BYTE,
                    componentsPerAttribute : 1,
                    values: applyOffset
                });
            }

            return new GeometryAttribute.Geometry({
                attributes : attributes,
                indices : indices,
                primitiveType : PrimitiveType.PrimitiveType.TRIANGLES,
                boundingSphere : new BoundingSphere.BoundingSphere(Cartographic.Cartesian3.ZERO, radius),
                offsetAttribute : boxGeometry._offsetAttribute
            });
        };

        var unitBoxGeometry;

        /**
         * Returns the geometric representation of a unit box, including its vertices, indices, and a bounding sphere.
         * @returns {Geometry} The computed vertices and indices.
         *
         * @private
         */
        BoxGeometry.getUnitBox = function() {
            if (!when.defined(unitBoxGeometry)) {
                unitBoxGeometry = BoxGeometry.createGeometry(BoxGeometry.fromDimensions({
                    dimensions : new Cartographic.Cartesian3(1.0, 1.0, 1.0),
                    vertexFormat : VertexFormat.VertexFormat.POSITION_ONLY
                }));
            }
            return unitBoxGeometry;
        };

    exports.BoxGeometry = BoxGeometry;

});