solved position vs absolutePosition

[Art Vandelay]

Hi,

In the drag and drop demo in the playground, if I change position.addInPlace to absolutePosition.addInPlace it stops working. Can anyone explain what is happening here (thus also clarifying the difference between position and absolute position).

Thanks!

[RaananW]

The position is the object's position in its own coordinate system. If you simply place an object in a scene, it's position and absolute position will technically be the same.

The problem starts when you add  a parent to the object. If the parent's x is 1, and the object's x is 0, it's position's x will be 0, but absolute position will be 1.

You cannot change the absolute position. It is a read-only vector (you can Set it, but not change it). that's why it doesn't work in the drag & drop example.

[Gijs]

In addition to what @RaananW said, you can see how it's done in the code:

Line 206
Line 267
Line 276
https://github.com/BabylonJS/Babylon.js/blob/4480b79c5ea42961566adf5eb1f591c0c79a7596/src/Mesh/babylon.transformNode.ts

So you can use setAbsolutePosition() instead

[Art Vandelay]

Thanks guys, that's just what I needed to know