NormalMap皱纹在黑色对象中无效-Three.js

Question

我正在使用threejs将3d对象渲染到Web中。我正在使用法线贴图加载皱纹效果。在所有浅色上都清晰可见皱纹，而在黑色和棕色上则看不到皱纹。这与阴影颜色或强度有关吗？

任何帮助将不胜感激。

var mtlLoader = new THREE.MTLLoader();
            //mtlLoader.setBaseUrl(jsStoreDirectory+'Configurator-Angular/build/assets/materials/');
            mtlLoader.setPath(jsStoreDirectory+'Configurator-Angular/build/assets/materials/');
            mtlLoader.load(mtlFile, function (materials) {
                materials.preload();
                console.log(materials);
                var objLoader = new THREE.OBJLoader();
                objLoader.setMaterials(materials);
                objLoader.setPath(jsStoreDirectory+'Configurator-Angular/build/assets/materials/');
                objLoader.load(objFile, function (object) {
                    //var imgSrc = "http://localhost:8080/CustomSublimation/store/3D/assets/228180.png";
                    objResponse = object;
                    imgSrc = image;
                    //console.log(imgSrc);
                    textureLoader = new THREE.TextureLoader();
                    textureLoader.crossOrigin = '';
                    texture = textureLoader.load( imgSrc );
                    var normalMapTexture = textureLoader.load(jsStoreDirectory+'Configurator-Angular/build/assets/materials/'+styleNumber+'-NormalMap.png');
                    var textureReverse = textureLoader.load( imageReverse );
                    var i=0;
                  object.traverse( function( node ) {
                         if( node.material ) {
                             var materialn = new THREE.MeshPhongMaterial({
                                map: texture,
                                normalMap: normalMapTexture
                                });
                             if(imageReverse != undefined && imageReverse != 'undefined' && imageReverse != ""){
                                 var materialReverse = new THREE.MeshPhongMaterial({
                                     map: textureReverse
                                });
                             }else{
                                 var materialReverse = new THREE.MeshPhongMaterial({
                                     color: 0xCDCDCD
                                });
                             }
                             if ( node instanceof THREE.Mesh ) {

                                 if(node.material[0]){
                                     var j;
                                     for(j=0; j < node.material.length; j++){
                                         var materialnew = new THREE.MeshPhongMaterial({
                                            map: texture,
                                            normalMap: normalMapTexture
                                            });
                                         if(node.material[j].name != 'reverse'){
                                             materialnew.name= node.material[j].name;
                                             node.material[j]=materialnew;
                                         }else{
                                             materialReverse.name= node.material[j].name;
                                             node.material[j]=materialReverse;
                                         }
                                     }
                                 }else{
                                     if(node.material.name == 'reverse'){
                                         materialReverse.name= node.material.name;
                                         node.material = materialReverse;
                                     }else{
                                         materialn.name = node.material.name;
                                         node.material = materialn;
                                     }

                                 }

                                mesh[i] = node;
                                i=i+1;
                                node.castShadow = true;
                            } 
                         }
                     });

                    scene.add(object);

                });

            });