Why I get the same result in Object3D.getWorldPosition()?

Questions
1 
var a = new THREE.Object3D();
a.translateY(10)
a.updateMatrixWorld();
console.log(a.getWorldPosition( new THREE.Vector3(0,5,1) ));
console.log(a.getWorldPosition( new THREE.Vector3(0,0,1) ));

console display is
n {x: 0, y: 10, z: 0}
n {x: 0, y: 10, z: 0}
I just want the wold position. How to get it?
I think it should be (0,15,1) and (0,10,1)

THREE.REVISION is 101
Thanks

2

It seems you are not using Object3D.getWorldPosition() correctly. The parameter of the method is just the target vector where the result (the position of a in world space) is stored. That’s the reason why have for both invocations the same result.

It seems you want to use Object3D.localToWorld().

https://jsfiddle.net/u563whr4/

1 Like
3

Oh, yes, you are right. I am confuse by these functions.
Thanks so much