使用Three.js启用平滑着色 [英] Enable smooth shading with Three.js

问题描述

我正在使用带有Three.js的MTL和OBJ文件渲染带纹理的对象。我的代码在这里工作，但我的模型显示为平面阴影。如何启用平滑着色？

I'm rendering an object with textures using MTL and OBJ files with Three.js. My code here works but my model is displayed as flat shaded. How do I enable smooth shading?

var scene = new THREE.Scene();  
var mtlLoader = new THREE.MTLLoader();
mtlLoader.setPath('assets/');
mtlLoader.setBaseUrl('assets/');
mtlLoader.load('asset.mtl', function(materials) {

    materials.preload();

    var objLoader = new THREE.OBJLoader();
    objLoader.setMaterials(materials);
    objLoader.setPath('assets/');
    objLoader.load('asset.obj', function(object) {

       //
       // This solved my problem
       //
       object.traverse(function(child) {
           if(child instanceof THREE.Mesh)
           {
              child.material.shading = THREE.SmoothShading;
           }
       });
       //
       //

       scene.add(object);
    });
});

编辑：
我使用解决方案更新了我的代码回答。

I updated my code with a solution that fixed my problem based on the accepted answer.

推荐答案

这可能是我现在能想到的两件事之一。

It could be one of two things that I can think of right now.

可能是材料设置为 FlatShading 。在这种情况下，只是以某种方式检索对象并使用 object.material.shading = THREE.SmoothShading; 进行修复。

It could be that the material is set to FlatShading. In this case just somehow retrieve the object and use object.material.shading = THREE.SmoothShading; to fix.

如果不改变它，则对象可能包含每顶点法线（意味着每个三角形的每个顶点都附加法线），并且每个三角形的所有法线都指向相同的方向。这可以在3d编辑过程中更好地解决，但您也可以在three.js中重新计算法线：

If that doesn't change it, it's possible that the object contains per-vertex-normals (meaning that every vertex of every triangle has a normal attached to it) and that all normals for each triangle point in the same direction. This is something that should better be solved in the 3d-editing process, but you can also re-compute the normals in three.js:

object.geometry.computeVertexNormals(true);

这应该 [1] 重新计算光滑曲面的法线。但是，它只适用于常规Geometries和Indexed BufferGeometries（或者，换句话说：如果几何体没有关于顶点被重用于相邻面的信息，它将无法工作）

This should [1] recompute the normals for smooth surfaces. However, it will only work for regular Geometries and Indexed BufferGeometries (or, to put it the other way around: it won't work if the geometry doesn't have information about vertices being reused for adjacent faces)

[1]：我没有亲自测试，只是按照我刚刚在代码中阅读的内容进行测试

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