/**
* @author benaadams / https://twitter.com/ben_a_adams
* based on THREE.SphereGeometry
*/
export class SphereBufferGeometry {
   // THREE.SphereBufferGeometry = function(radius, widthSegments, heightSegments, phiStart, phiLength, thetaStart, thetaLength) {
   //    THREE.BufferGeometry.call(this);
   //    this.type = 'SphereBufferGeometry';
   //    this.parameters = {
   //       radius: radius,
   //       widthSegments: widthSegments,
   //       heightSegments: heightSegments,
   //       phiStart: phiStart,
   //       phiLength: phiLength,
   //       thetaStart: thetaStart,
   //       thetaLength: thetaLength
   //    };
   //    radius = radius || 50;
   //    widthSegments = Math.max(3, Math.floor(widthSegments) || 8);
   //    heightSegments = Math.max(2, Math.floor(heightSegments) || 6);
   //    phiStart = phiStart !== undefined ? phiStart : 0;
   //    phiLength = phiLength !== undefined ? phiLength : Math.PI * 2;
   //    thetaStart = thetaStart !== undefined ? thetaStart : 0;
   //    thetaLength = thetaLength !== undefined ? thetaLength : Math.PI;
   //    var thetaEnd = thetaStart + thetaLength;
   //    var vertexCount = ((widthSegments + 1) * (heightSegments + 1));
   //    var positions = new THREE.BufferAttribute(new Float32Array(vertexCount * 3), 3);
   //    var normals = new THREE.BufferAttribute(new Float32Array(vertexCount * 3), 3);
   //    var uvs = new THREE.BufferAttribute(new Float32Array(vertexCount * 2), 2);
   //    var index = 0, vertices = [], normal = new THREE.Vector3();
   //    for (var y = 0; y <= heightSegments; y++) {
   //       var verticesRow = [];
   //       var v = y / heightSegments;
   //       for (var x = 0; x <= widthSegments; x++) {
   //          var u = x / widthSegments;
   //          var px = - radius * Math.cos(phiStart + u * phiLength) * Math.sin(thetaStart + v * thetaLength);
   //          var py = radius * Math.cos(thetaStart + v * thetaLength);
   //          var pz = radius * Math.sin(phiStart + u * phiLength) * Math.sin(thetaStart + v * thetaLength);
   //          normal.set(px, py, pz).normalize();
   //          positions.setXYZ(index, px, py, pz);
   //          normals.setXYZ(index, normal.x, normal.y, normal.z);
   //          uvs.setXY(index, u, 1 - v);
   //          verticesRow.push(index);
   //          index++;
   //       }
   //       vertices.push(verticesRow);
   //    }
   //    var indices = [];
   //    for (var y = 0; y < heightSegments; y++) {
   //       for (var x = 0; x < widthSegments; x++) {
   //          var v1 = vertices[y][x + 1];
   //          var v2 = vertices[y][x];
   //          var v3 = vertices[y + 1][x];
   //          var v4 = vertices[y + 1][x + 1];
   //          if (y !== 0 || thetaStart > 0) indices.push(v1, v2, v4);
   //          if (y !== heightSegments - 1 || thetaEnd < Math.PI) indices.push(v2, v3, v4);
   //       }
   //    }
   //    this.setIndex(new (positions.count > 65535 ? THREE.Uint32Attribute : THREE.Uint16Attribute)(indices, 1));
   //    this.addAttribute('position', positions);
   //    this.addAttribute('normal', normals);
   //    this.addAttribute('uv', uvs);
   //    this.boundingSphere = new THREE.Sphere(new THREE.Vector3(), radius);
   // };
   // THREE.SphereBufferGeometry.prototype = Object.create(THREE.BufferGeometry.prototype);
   // THREE.SphereBufferGeometry.prototype.constructor = THREE.SphereBufferGeometry;
}