【Threejs】详解模型居中的各种实现方法

1. // const p0 = obj.position.clone();
   // var box = new THREE.Box3().setFromObject( obj );
   // // box.getCenter( obj.position ); // this re-sets the obj position
   // box.getCenter( p0 );
   // obj.geometry.center();
   
   // let center = new THREE.Vector3();
   // obj.geometry.computeBoundingBox();
   // obj.geometry.boundingBox.getCenter(center);
   // obj.geometry.center();
   // obj.position.copy(center);
   
   const p1 = modelObj.position.clone();
   // const p2 = obj.position.clone();
   
   scene.updateMatrixWorld(true);
   
   // var v2 = new THREE.Vector3().copy(p2);
   // obj.localToWorld(v2);
   
   

// 声明一个三维向量用来保存网格模型的世界坐标
var worldPosition = new THREE.Vector3();
// 获得世界坐标，执行getWorldPosition方法，提取网格模型的世界坐标结果保存到参数worldPosition中
obj.getWorldPosition(worldPosition)
console.log('查看网格模型世界坐标',worldPosition);
console.log('查看网格模型本地坐标',obj.position);


modelObj.position.set(p1.x - worldPosition.x, p1.y - worldPosition.y, p1.z - worldPosition.z);