threejs加载obj文件后如何获取其下的mesh的相对位置,解决位置为{0,0,0}的问题，three 导入的OBJ根据自身坐标中心的自转

我在网上查了很久没有详细代码。整理了一下

object.children[0].geometry.computeBoundingBox();

var centroid = new THREE.Vector3();
centroid.addVectors( object.children[0].geometry.boundingBox.min, object.children[0].geometry.boundingBox.max );
centroid.multiplyScalar( 0.5 );

centroid.applyMatrix4( object.children[0].matrixWorld );

object.children[0].geometry.center(centroid.x*0.05, centroid.y*0.05, centroid.z*0.05)
object.position.set(centroid.x*0.05, centroid.y*0.05, centroid.z*0.05)//

导入OBJ时 

         var mtlLoader1 = new THREE.MTLLoader();
           mtlLoader1.setPath('精简风扇/');
mtlLoader1.load('shanye_020.mtl', function(materials) {
                mtlLoader1.receiveShadow = true;
               materials.preload();

               var objLoader1 = new THREE.OBJLoader();
               objLoader1.setMaterials(materials);
               objLoader1.setPath('精简风扇/');
               objLoader1.load('shanye_020.obj', function(object) {
                   console.log(object)

                   // object.children[0].geometry.computeBoundingBox()

                   //1111

                   object.children[0].geometry.computeBoundingBox();

                   var centroid = new THREE.Vector3();
                   centroid.addVectors( object.children[0].geometry.boundingBox.min, object.children[0].geometry.boundingBox.max );
                   centroid.multiplyScalar( 0.5 );

                   centroid.applyMatrix4( object.children[0].matrixWorld );



                   mesh = object;

                   object.traverse(function(child)
                   {

                     
                       console.log(child)

                       objects.push( child );
          
                   });
                   for(k in object.children){

                       object.children[k].castShadow = true;
                       object.children[k].receiveShadow = true;
                   }



                   object.scale.set(0.05, 0.05, 0.05);
                   object.children[0].geometry.center(centroid.x*0.05, centroid.y*0.05, centroid.z*0.05)
                   object.position.set(centroid.x*0.05, centroid.y*0.05, centroid.z*0.05)//
                   helper = new THREE.BoundingBoxHelper(object, 0xff0000);
                   helper.update();
                   scene.add(helper);
                   object.enabled  = true
                   object.castShadow  = true
                   object.receiveShadow = true;
                   // object.children[0].geometry.center()


                   scene.add(mesh);
                   objects.push( object)

               }, onProgress, onError);


           })

划重点

 我是综合了两个帖子实现的OBJ按自身坐标中心旋转；

参考

https://blog.csdn.net/yuanben_wuxin/article/details/79274808；

https://blog.csdn.net/qq_35750405/article/details/52076553

需要源码的可以私信