text: //This file is automatically rebuilt by the Cesium build process.
  export default "/**\n\
   * Computes the size of a pixel in meters at a distance from the eye.\n\
  \n\
   * @name czm_metersPerPixel\n\
   * @glslFunction\n\
   *\n\
   * @param {vec3} positionEC The position to get the meters per pixel in eye coordinates.\n\
   *\n\
   * @returns {float} The meters per pixel at positionEC.\n\
   */\n\
  float czm_metersPerPixel(vec4 positionEC)\n\
  {\n\
      float width = czm_viewport.z;\n\
      float height = czm_viewport.w;\n\
      float pixelWidth;\n\
      float pixelHeight;\n\
  \n\
      float top = czm_frustumPlanes.x;\n\
      float bottom = czm_frustumPlanes.y;\n\
      float left = czm_frustumPlanes.z;\n\
      float right = czm_frustumPlanes.w;\n\
  \n\
      if (czm_sceneMode == czm_sceneMode2D || czm_orthographicIn3D == 1.0)\n\
      {\n\
          float frustumWidth = right - left;\n\
          float frustumHeight = top - bottom;\n\
          pixelWidth = frustumWidth / width;\n\
          pixelHeight = frustumHeight / height;\n\
      }\n\
      else\n\
      {\n\
          float distanceToPixel = -positionEC.z;\n\
          float inverseNear = 1.0 / czm_currentFrustum.x;\n\
          float tanTheta = top * inverseNear;\n\
          pixelHeight = 2.0 * distanceToPixel * tanTheta / height;\n\
          tanTheta = right * inverseNear;\n\
          pixelWidth = 2.0 * distanceToPixel * tanTheta / width;\n\
      }\n\
  \n\
      return max(pixelWidth, pixelHeight) * czm_pixelRatio;\n\
  }\n\
  ";
  