Tranform from Parent Reference to World

[amorgan]

I'm sure this has been covered before and I've read some of the tutorials covering topics like this, but I'm still struggling.

 

I have a mesh that is parented to my camera and I want to to be able to transform it from the parented position/rotation to the world's position/rotation.

 

Doing position is easy since I can just get _absolutePosition, the rotation I am still stuck on. Could you please advise?

 

Also, if you have any recommendations for references/resources on matrix operations and quaternions that would be greatly appreciated. I have advanced math education (including linear algebra), but it's been a while and I am out of practice.

 

Thank you,

amorgan

[GameMonetize]

Hello, you should do something like this:

var worldMat = mesh.getWorldMatrix();
var translation = new BABYLON.Vector3();
var quaterion = new BABYLON.Quaternion();
var scale = new BABYLON.Vector3();

worldMat.decompose(scale, rotation, translation);

http://doc.babylonjs.com/classes/2.3/Matrix#decompose-scale-rotation-translation-rarr-boolean

[amorgan]

Ah hah! I saw this in the documentation, but it was unclear to me how to use it.

 

Exactly what I wanted. For completeness I did:

// mesh is parented to camera before this line
var worldMat = mesh.getWorldMatrix();
var newTranslation = new BABYLON.Vector3();
var newQuaterion = new BABYLON.Quaternion();
var newScale = new BABYLON.Vector3();
worldMat.decompose(newScale, newQuaterion, newTranslation);

mesh.parent = null;

mesh.rotationQuaternion = newQuaterion;
mesh.position = newTranslation;

 

Thanks!