[Closed] Mesh.lookAt rotates mesh, but not really..

[aWeirdo]

Hi, i notised this bug a while ago, but never got around to reporting it before now,

As shown in the following PG, the mesh.lookAt appears to rotate the mesh and the mesh "looks" at the object, but it doesn't actually update the mesh.rotation.

the lookAt target is a sphere aproximately 45* from starting point.

PG controls:

left mouse click: lookAt & move based on mesh.rotation.y.

mouse wheel click: rotate 90* and move based on mesh.rotation.y.

right mouse click: move based on starting mesh.rotation.y.

http://www.babylonjs-playground.com/#BJZC6#3

 

The lookAt method also seems to lock the target on 0 rotation.y, any new changes are completely ignored / overwritten.

Console.log's of before and after each action (right-click only log's one line).

1 left mouse click(LookAt) & 2 mouse wheel clicks(+90*):

VM379:45 Box.rotation.y Before lookAt: 0
VM379:48 Box.rotation.y After lookAt: 0
VM379:50 Box.rotation.y Before 90* rotation: 0
VM379:53 Box.rotation.y After 90* rotation: 1.5707963267948966
VM379:50 Box.rotation.y Before 90* rotation: 0
VM379:53 Box.rotation.y After 90* rotation: 1.5707963267948966

 

1 mouse wheel click(+90*) & 1 left mouse click(lookAt) & another mouse wheel click.

VM385:50 Box.rotation.y Before 90* rotation: 0
VM385:53 Box.rotation.y After 90* rotation: 1.5707963267948966
VM385:45 Box.rotation.y Before lookAt: 1.5707963267948966
VM385:48 Box.rotation.y After lookAt: 0 //reset to 0..?
VM385:50 Box.rotation.y Before 90* rotation: 0
VM385:53 Box.rotation.y After 90* rotation: 1.5707963267948966 //This doesn't effect anything.

 

4 mouse wheel clicks(+90*):

VM378:50 Box.rotation.y Before 90* rotation: 0
VM378:53 Box.rotation.y After 90* rotation: 1.5707963267948966
VM378:50 Box.rotation.y Before 90* rotation: 1.5707963267948966
VM378:53 Box.rotation.y After 90* rotation: 3.141592653589793
VM378:50 Box.rotation.y Before 90* rotation: 3.141592653589793
VM378:53 Box.rotation.y After 90* rotation: 4.71238898038469
VM378:50 Box.rotation.y Before 90* rotation: 4.71238898038469
VM378:53 Box.rotation.y After 90* rotation: 6.283185307179586

 

1 right-mouse click(no rotation altering) & 2 mouse wheel clicks(+90*) & 1 right-mouse click again:

VM380:55 Right-click, No rotation altering: 0
VM380:50 Box.rotation.y Before 90* rotation: 0
VM380:53 Box.rotation.y After 90* rotation: 1.5707963267948966
VM380:50 Box.rotation.y Before 90* rotation: 1.5707963267948966
VM380:53 Box.rotation.y After 90* rotation: 3.141592653589793
VM380:55 Right-click, No rotation altering: 3.141592653589793

 

 

 

[GameMonetize]

Hello!

LookAt updates the quaternion:

https://github.com/BabylonJS/Babylon.js/blob/master/src/Mesh/babylon.abstractMesh.ts#L762

[aWeirdo]

@Deltakosh ahh.. i guess it was never even supposed to update the rotation values then.. Doh

[Dad72]

However, you can always convert quaternion => Euler for update the value rotation.y .

mesh.rotation.y = mesh.rotationQuaternion.toEulerAngles().y;