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

/**
 * The automatic GLSL constant for {@link Pass#OVERLAY}
 *
 * @name czm_passOverlay
 * @glslConstant
 *
 * @see czm_pass
 */
const float czm_passOverlay = 10.0;