declare const _default: "\n#ifdef MAPTEXTURE\nuniform float material_normalDetailMapBumpiness;\n\nvec3 blendNormals(vec3 n1, vec3 n2) {\n    // https://blog.selfshadow.com/publications/blending-in-detail/#detail-oriented\n    n1 += vec3(0, 0, 1);\n    n2 *= vec3(-1, -1, 1);\n    return n1 * dot(n1, n2) / n1.z - n2;\n}\n#endif\n\nvec3 addNormalDetail(vec3 normalMap) {\n#ifdef MAPTEXTURE\n    vec3 normalDetailMap = unpackNormal(texture2DBias($SAMPLER, $UV, textureBias));\n    normalDetailMap = mix(vec3(0.0, 0.0, 1.0), normalDetailMap, material_normalDetailMapBumpiness);\n    return blendNormals(normalMap, normalDetailMap);\n#else\n    return normalMap;\n#endif\n}\n";
export default _default;