text: //This file is automatically rebuilt by the Cesium build process.
  /*global define*/
  define(function() {
      "use strict";
      return "attribute vec2 direction;\n\
  \n\
  uniform float u_size;\n\
  \n\
  varying vec2 v_textureCoordinates;\n\
  \n\
  void main() \n\
  {\n\
      vec4 position;\n\
      if (czm_morphTime == 1.0)\n\
      {\n\
          position = vec4(czm_sunPositionWC, 1.0);\n\
      }\n\
      else\n\
      {\n\
          position = vec4(czm_sunPositionColumbusView.zxy, 1.0);\n\
      }\n\
      \n\
      vec4 positionEC = czm_view * position;\n\
      vec4 positionWC = czm_eyeToWindowCoordinates(positionEC);\n\
      \n\
      vec2 halfSize = vec2(u_size * 0.5);\n\
      halfSize *= ((direction * 2.0) - 1.0);\n\
      \n\
      gl_Position = czm_viewportOrthographic * vec4(positionWC.xy + halfSize, -positionWC.z, 1.0);\n\
      \n\
      v_textureCoordinates = direction;\n\
  }\n\
  ";
  });