code is as follows. After introducing the model using ColladaLoader, I don"t know how to use Geometry or how to get the size of the model.
var loader = new THREE.ColladaLoader();
var mesh;
loader.load("dae/LuckyStrike/luckystrike.dae", function (result) {
mesh = result.scene.children[0].clone();
//
// mesh.position.set(-1.4,-1,-.5)
scene.add(mesh);
});self-question and answer, found a way! You can get the midpoint by calculating max-min using the newTHREE.Box3 () function.
loader.load( daeUrl, function (result) {
mesh = result.scene
let scaleNum = 1
let box = new THREE.Box3().setFromObject(mesh);
//
mesh.position.set((-box.max.x - box.min.x) * scaleNum * 20, (-box.max.y - box.min.y) * scaleNum * 20, (-box.max.z - box.min.z) * scaleNum * 20)
//
mesh.scale.set(scaleNum, scaleNum, scaleNum);
scene.add(mesh);
})