text: "use strict";
  
  // MIT License
  
  // Copyright (c) 2016 Trevor Barnwell
  
  // Permission is hereby granted, free of charge, to any person obtaining a copy
  // of this software and associated documentation files (the "Software"), to deal
  // in the Software without restriction, including without limitation the rights
  // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  // copies of the Software, and to permit persons to whom the Software is
  // furnished to do so, subject to the following conditions:
  
  // The above copyright notice and this permission notice shall be included in all
  // copies or substantial portions of the Software.
  
  // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  // SOFTWARE.
  
  
  /** Generates the vector(3) from the
      spherical co-ordinates with radius 1.
  
      Parameters:
        theta: The anngle off the Y-pole (theta in [-pi/2, pi/2]).
        phi: The angle in the x/z plane (phi in [0, 2*pi)).
  
      Returns:
        A vec3 in the direction requested.
  */
  function sphere_vector3(theta, phi) {
    var retval = vec3.fromValues(
      Math.cos(theta) * Math.sin(phi),
      Math.cos(phi),
      Math.sin(theta) * Math.sin(phi)
    );
    return retval;
  }
  
  /** Generates the point from the
      spherical co-ordinates with radius 1.
  
      Parameters:
        theta: The anngle off the Y-pole (theta in [-pi/2, pi/2]).
        phi: The angle in the x/z plane (phi in [0, 2*pi)).
  
      Returns:
        A vec4 with the point on the sphere.
  */
  function sphere_vector(theta, phi) {
    var retval = vec4.fromValues(
      Math.cos(theta) * Math.sin(phi),
      Math.cos(phi),
      Math.sin(theta) * Math.sin(phi),
      1.0
    );
    return retval;
  }
  