module.exports = "float metalnessFactor = metalness * POLY_metalness;\n\n#ifdef USE_METALNESSMAP\n\n	vec4 texelMetalness = texture2D( metalnessMap, vUv );\n\n	// reads channel B, compatible with a combined OcclusionRoughnessMetallic (RGB) texture\n	metalnessFactor *= texelMetalness.b;\n\n#endif\n";
