javascript - Three.js How to get position of a mesh?

Question

With the below code, position of a mesh is returned as (0, 0, 0) but it is not. So is the positio?n vector calculated after render process?

me.scene.add(objMesh); //me is a project class
objMesh.updateMatrixWorld(true);
alert(objMesh.position.x + ',' + objMesh.position.y + ',' + objMesh.position.z);

objMesh is created from objfile, it is added to the scene correctly and centroid is approx (-8, 3, 0) but position vector of objMesh is (0, 0, 0) do we have to auto calculate something first or should i calculate it manually from geometry vertices of the mesh ?

http://81.214.75.32:8181/admin is the url

the site is in Turkish so i will translate the UI items

in the site there is "Dosya" menu item oppen the menu item and select "Proje A?" a dialog appears in that dialog select MUTFAK_1 scene will appear in that scene, every meshes position is (0, 0, 0) is that possible :)

Answer 1

object.position is always local to the object. If you want to get the position in world space you need to get it from object.matrixWorld.

Try with this:

scene.add(objMesh);
scene.updateMatrixWorld(true);
var position = new THREE.Vector3();
position.getPositionFromMatrix( objMesh.matrixWorld );
alert(position.x + ',' + position.y + ',' + position.z);

r58

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Update:

The function getPositionFromMatrix() has been renamed to setFromMatrixPosition().