How to set all sides visible for Mesh

Hi,
I am new in Babylon and I do not know how to solve this problem. I have data in .obj format from Blender and when I try to display them via BABYLON.SceneLoader.ImportMesh only one side of Mesh is visible (the other one is divided in to 2 triangles). I have tried function BABYLON.Mesh.DOUBLESIDE but I have not found way how to used it for imported Mesh. It worked for Mesh creation but not for import.

I would be grateful for any advice, thanks!

You can try to turn backfaceculling on on the mesh material.

material.backFaceCulling = false;

This should then display both sides of your mesh.

Thanks for your reply and sorry for long response. Actually this is not solution of my problem. Mesh still display triangles from one side of view.

Can you reproduce the issue in a playground? This will help in identifying the problem.
https://doc.babylonjs.com/babylon101/first
https://doc.babylonjs.com/resources/external_pg_assets

This (hidden) static method can transform a singled sided mesh geometry into a double sided geometry

It works at the VertexData level of any mesh, imported or not. The mesh is to be rebuilt from the new VertexData anyway (changed geometry :twice more vertices added)