Geometric transformation through worldMatrix

[Gwir]

I need to scale a mesh along global axis. The mesh.scaling attribute refers to mesh local axis so it's useless to me.

I managed to scale the mesh through the direct manipulation of the worldMatrix, but when i rotate the mesh the worldMatrix is reset to its original values and scaling and position data is lost.

I also tried to call the bakeCurrentTransformIntoVertices() function after scaling the mesh, but the mesh loses its position and gets other unwanted behaviours.

I'd like to avoid the trick of parenting the mesh and scale the parent instead of the mesh.

Is there a way to scale a mesh along a global axis?

[GameMonetize]

I would say:

- Convert your global axis to local axis

- Scale accordingly

Pseudo-code:

var globalAxisScale = new BABYLON.Vector3(0.5, 2.0, 1.0);
var inverted = BABYLON.Matrix.Invert(mesh.getWorldMatrix());
var localAxisScale = BABYLO.Vector3.TransformNormal(globalAxisScale, inverted);

 

[adam]

Either I'm doing it wrong, or that isn't going to work.

http://www.babylonjs-playground.com/#TF2KO#0

[Gwir]

Still a scaling along the mesh local axis. I need it to be along the global one, even if it cause the "stretching" of the mesh.

[adam]

I created a worldSpaceScale function in this PG:

http://www.babylonjs-playground.com/#TF2KO#3

It's modifying the positions of the vertices, so you have to make the mesh updatable.

Here is another version that resets the rotation:

http://www.babylonjs-playground.com/#TF2KO#7

[Gwir]

Thank you very much, it works.

What happens if the scaling needs to be on the camera axis?

[adam]

31 minutes ago, Gwir said:

What happens if the scaling needs to be on the camera axis?

Like this?

http://www.babylonjs-playground.com/#TF2KO#9

[Gwir]

Exactly, thank you very much!