Updated builds.

build/three.js

@@ -23559,7 +23559,7 @@ THREE.ShaderChunk[ 'morphtarget_vertex' ] = "#ifdef USE_MORPHTARGETS\n	transform
 
 // File:src/renderers/shaders/ShaderChunk/normal_fragment.glsl
 
-THREE.ShaderChunk[ 'normal_fragment' ] = "#ifdef FLAT_SHADED\n	vec3 fdx = dFdx( vViewPosition );\n	vec3 fdy = dFdy( vViewPosition );\n	vec3 normal = normalize( cross( fdx, fdy ) );\n#else\n	vec3 normal = normalize( vNormal );\n	#ifdef DOUBLE_SIDED\n		normal = normal * ( -1.0 + 2.0 * float( gl_FrontFacing ) );\n	#endif\n#endif\n#ifdef USE_NORMALMAP\n	normal = perturbNormal2Arb( -vViewPosition, normal );\n#elif defined( USE_BUMPMAP )\n	normal = perturbNormalArb( -vViewPosition, normal, dHdxy_fwd() );\n#endif\n";
+THREE.ShaderChunk[ 'normal_fragment' ] = "#ifdef FLAT_SHADED\n	vec3 fdx = vec3( dFdx( vViewPosition.x ), dFdx( vViewPosition.y ), dFdx( vViewPosition.z ) );\n	vec3 fdy = vec3( dFdy( vViewPosition.x ), dFdy( vViewPosition.y ), dFdy( vViewPosition.z ) );\n	vec3 normal = normalize( cross( fdx, fdy ) );\n#else\n	vec3 normal = normalize( vNormal );\n	#ifdef DOUBLE_SIDED\n		normal = normal * ( -1.0 + 2.0 * float( gl_FrontFacing ) );\n	#endif\n#endif\n#ifdef USE_NORMALMAP\n	normal = perturbNormal2Arb( -vViewPosition, normal );\n#elif defined( USE_BUMPMAP )\n	normal = perturbNormalArb( -vViewPosition, normal, dHdxy_fwd() );\n#endif\n";
 
 // File:src/renderers/shaders/ShaderChunk/normalmap_pars_fragment.glsl