/**
 * A built-in GLSL floating-point constant for <code>2pi</code>.
 *
 * @alias czm_twoPi
 * @glslConstant
 *
 * @see CesiumMath.TWO_PI
 *
 * @example
 * // GLSL declaration
 * const float czm_twoPi = ...;
 *
 * // Example
 * float pi = czm_twoPi / 2.0;
 */
const float czm_twoPi = 6.283185307179586;