How to fix coordinates after rotation?

Questions
1

Hello! I am create my first project in Babylon.js - Rubik’s Cube Game.

I have some trouble with rotations.
I have array with cubies and I filter their and select some cubies when a need rotate some cube’s face.
I change parent node for selected cubies, then I play animation for this parent and change parent again.

When I run animation again some cubies have wrong coordinates (previous value equal -1, but new value equal -2.220446049250313e-16) and I have a bug :frowning:
I think I need reset some parameters for cubies after transformation, but I don’t understand which parameters.
Could you help me with this problem please :slight_smile:

rotate-bug

I created example in playground: Babylon.js Playground

3 Likes
2

Try setParent(null) after you are done rotating.

3

@adam, thanks for your answer!
I added this fix, but the coordinates still changed and bug remained :pensive:
https://www.babylonjs-playground.com/#1PV77K#1

4

If I logged cubie coordinates (cubie.position and cubie.absolutePosition) then I saw wrong Y or X coordinate, but in Scene Inspector coordinates is right. Maybe it’s a bug?

Screenshot 2020-02-17 at 09.07.25
Screenshot 2020-02-17 at 09.07.251680×943 160 KB

1 Like
5

Forgive me, you may have already tried this, but can you not simply round the cubie positions after de-parenting?

            for (let cubie of cubies) {
                cubie.setParent(null);
                cubie.position.x = Math.round(cubie.position.x);
                cubie.position.y = Math.round(cubie.position.y);
                cubie.position.z = Math.round(cubie.position.z);
            }

Annoying the value doesn’t snap to a nice round number after the animation is performed (at least, for rotations that are multiples of 90 degrees).

2 Likes
6

Are the cubies sentient or? Is that beyond the scope of this model?

1 Like
7

@kjg thanks, I didn’t think about the calculation error after rotation :pray:

1 Like
8

Do you mean coordinates’ scope?