Three.js紋理模型不能正確應用跨物體

我有一個衝浪板obj文件，我想在頂部和底部的表面上應用紋理，但當紋理在中間時會在我的面部應用時分裂。材料也被應用在網格的內部。問題與模型有關嗎？還是我錯過了代碼中的某些內容？Three.js紋理模型不能正確應用跨物體

var loader = new THREE.OBJLoader(); 

    var texture = new THREE.Texture(); 
    var ImageLoader = new THREE.ImageLoader(); 
    ImageLoader.load("models/white.jpg", function (image) { 
     texture.image = image; 
     texture.needsUpdate = true; 
    }); 

    var custom = new THREE.Texture(); 
    var customLoader = new THREE.ImageLoader(); 
    customLoader.load("models/UV_Grid_Sm.jpg", function(image) { 
     custom.image = image; 
     custom.mapping = THREE.UVMapping; 
     custom.needsUpdate = true; 
    }); 


    loader.load("models/Hidden 5'4-19'5-2 (Holes_Patched).obj", function(object){ 
     object.traverse(function(child) { 

      if (child instanceof THREE.Mesh) { 

       if(child.name === 'Bottom') { 
        child.material = new THREE.MeshStandardMaterial({ map: custom}); 

       } 
       else if(child.name === 'Top') { 
        child.material = new THREE.MeshStandardMaterial({ map: custom}); 

       } 
       else { 
        child.material = new THREE.MeshStandardMaterial({ map: texture}); 

       } 
      } 

     });

download obj file here的對象都有一個名爲「頂級」二組，但後來我可以改變。

Image of problem