GLTFLoader MeshStandardMaterial:normalMap makes material black

Questions
1 
var material = new THREE.MeshStandardMaterial( {

							color: 0xffffff,
							roughness: settings.roughness,
							metalness: settings.metalness,

							normalMap: normalMap,
							

							//aoMap: aoMap,
							//aoMapIntensity: 1,

							//displacementMap: displacementMap,
							//displacementScale: settings.displacementScale,
							//displacementBias: - 0.428408, // from original model

							envMap: envMap,
							envMapIntensity: settings.envMapIntensity,

							side: THREE.DoubleSide

						} );

						// model

						var loader = new GLTFLoader().setPath( 'models/gltf/' );
						loader.load( '1011TEST.glb', function ( gltf ) {

							gltf.scene.traverse( function ( child ) {

								if ( child.isMesh ) {

									child.material = material;
									console.log(material);
								}

							} );

							scene.add( gltf.scene );

						} );

if i dont add normalMap,it looks well.if i add normalMap,it turns black,why?

2

Since you load the normal map by yourself, make sure to set flipY to false to correspond the uv conventions of glTF.

normalMap.flipY = false;
3

thank you,
but still not work

4

Can you please share the glTF asset and normal map you are using?