Get size of mesh while taking its children into account

[royibernthal]

I have an invisible mesh that is the parent of a few child boxes, ordered horizontally one near the other.

I'm using the following line to figure out the size of a mesh:

getBoundingInfo().boundingBox.extendSize.scale(2)

When called on each of the child boxes, the vector returned is correct. When called on the parent mesh, (0, 0, 0) is returned.

Is there a way to get the size of the parent, taking into account all of its children?

[DigiHz Data]

I use this for getting size of meshes. It returns the right size even if it is set to NOT visible:

 

selected_entity is the mesh (obj).

function get_selected_mesh_size(selected_entity){
    $("#selected_entity_mesh_size_x").html(selected_entity.getBoundingInfo().boundingBox.extendSize.x*2*selected_entity.scaling.x);
    $("#selected_entity_mesh_size_y").html(selected_entity.getBoundingInfo().boundingBox.extendSize.y*2*selected_entity.scaling.y);
    $("#selected_entity_mesh_size_z").html(selected_entity.getBoundingInfo().boundingBox.extendSize.z*2*selected_entity.scaling.z);
}

[royibernthal]

That's the same as what I'm doing just with a slightly different syntax, correct me if I'm wrong.

[DigiHz Data]

Well our syntax is not the same.

Did you try with my syntax?

 

[royibernthal]

Like I said different syntax.

You're calling the same functions and accessing the same arguments with a different syntax, please help me see how it'd change anything.

I'd also like to emphasize that the problem is not invisibility of the mesh, but calculating its size while taking into account all of its children.

[adam]

It would help if you created a PG of the issue.

[royibernthal]

http://www.babylonjs-playground.com/#QHMT1#10

Note that I'm not looking for a workaround to calculate this specific PG some other way (like the workaround example I wrote in the PG), this is a simplified case.

I need to be able to get the size of a container mesh whatever children it contains and however they are placed and rotated - get the container's 3d boundaries box.

[adam]

http://www.babylonjs-playground.com/#QHMT1#11

I'm not sure how it will work with rotated meshes that are not boxes.

[royibernthal]

That was a bit more complex than I thought, I was certain there was going to be a built-in function that already does this, but apparently it's not a very popular thing to try to do.

Thank you very much.

[adam]

No problem.  I looked at the function again and realized that I didn't end up using the part that computes the center.  That can be removed.

http://www.babylonjs-playground.com/#QHMT1#12

[adam]

It works when the boxes aren't rotated:

http://www.babylonjs-playground.com/#QHMT1#15

but not when an outer box is rotated.  The width is wrong:

http://www.babylonjs-playground.com/#QHMT1#16

 

[NasimiAsl]

any binding box solution

like max x y z and min x y z of all BBx

 

[adam]

I think I figured it out:

http://www.babylonjs-playground.com/#QHMT1#18

There is a minimumWorld and maximumWorld in BoundingBox.

[gamedev44]

I had a problem when the combination of meshes were positioned -x,-y, or -z...

I think I fixed it here:

var min = new BABYLON.Vector3(Number.MAX_VALUE, Number.MAX_VALUE, Number.MAX_VALUE);

var max = new BABYLON.Vector3(Number.MIN_VALUE, Number.MIN_VALUE, Number.MIN_VALUE);

 

use instead:

var min = new BABYLON.Vector3(Number.MAX_VALUE, Number.MAX_VALUE, Number.MAX_VALUE);
 var max = new BABYLON.Vector3(Number.MAX_VALUE*-1, Number.MAX_VALUE*-1, Number.MAX_VALUE*-1);

    

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