node_modules/three/src/renderers/shaders/ShaderChunk/lightmap_fragment.glsl.js

export default /* glsl */`
#ifdef USE_LIGHTMAP

	reflectedLight.indirectDiffuse += PI * texture2D( lightMap, vUv2 ).xyz * lightMapIntensity; // factor of PI should not be present; included here to prevent breakage

#endif
`;