Facetdata after position/rotation changes

Questions
1

Hi, I looked through the excellent documentation on facet data, and was enthousiastic to try it out. However I quickly noticed my position/rotation was not properly reflected.

If I take the example from the docs (Babylon.js Playground) and add a mesh.position.y = 2 somewhere after the mesh creation the green lines are not moved along with the shape.

The docs mention “mesh.computeWorldMatrix(true);” but adding this anywhere doesn’t seem to solve it.

I’m very new to babylon so I’m probably just missing something simple.
Thanks in advance.

2

Hello and welcome!

Babylon Playground (as well as Babylon Sandbox) have a great tool for debugging - Babylon Inspector.

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Now let’s inspect meshes which you have in your scene. There are 2 of them: m and ls

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You can change their positions or any other possible values from the Inspector.
Since there are two meshes in your example, you need just add:
lineSystem.position.y = 2;
and here we are: https://playground.babylonjs.com/#1YTZAC#99
If you need to call Inspector from your scene outside PG or Sandbox just use:
scene.debugLayer.show()

3

The vertex data stores the geometry of the mesh , position, rotation stored separately in a matrix. The green lines are drawn based on only the vertex data

See Baking Transformations | Babylon.js Documentation