/**
 * A built-in GLSL floating-point constant for <code>pi/4</code>.
 *
 * @alias czm_piOverFour
 * @glslConstant
 *
 * @see CesiumMath.PI_OVER_FOUR
 *
 * @example
 * // GLSL declaration
 * const float czm_piOverFour = ...;
 *
 * // Example
 * float pi = 4.0 * czm_piOverFour;
 */
const float czm_piOverFour = 0.7853981633974483;