three.js/src/renderers/shaders/ShaderChunk/lights_physical_fragment.glsl.js

export default /* glsl */`
PhysicalMaterial material;
material.diffuseColor = diffuseColor.rgb * ( 1.0 - metalnessFactor );
material.specularRoughness = clamp( roughnessFactor, 0.04, 1.0 );
#ifdef STANDARD
	material.specularColor = mix( vec3( DEFAULT_SPECULAR_COEFFICIENT ), diffuseColor.rgb, metalnessFactor );
#else
	material.specularColor = mix( vec3( MAXIMUM_SPECULAR_COEFFICIENT * pow2( reflectivity ) ), diffuseColor.rgb, metalnessFactor );
	material.clearcoat = saturate( clearcoat ); // Burley clearcoat model
	material.clearcoatRoughness = clamp( clearcoatRoughness, 0.04, 1.0 );
#endif
#ifdef USE_SHEEN
	material.sheenColor = sheen;
#endif
`;