DSDSWeb/static/js/Cesium-1.53/Source/Shaders/Builtin/Constants/passEnvironment.glsl

/**
 * The automatic GLSL constant for {@link Pass#ENVIRONMENT}
 *
 * @name czm_passEnvironment
 * @glslConstant
 *
 * @see czm_pass
 */
const float czm_passEnvironment = 0.0;