How to set gravity for Mesh object of TransformNode class?

‘let carMesh: BABYLON.TransformNode = …’
How to set gravity for Mesh object of TransformNode class?

This is not per node, but at the engine level: Forces | Babylon.js Documentation

I have enabled physics for the current scene, and I can use the .physicsImpostor property to set impostors for individual meshes created with MeshBuilder().
But I’m using BABYLON.ContainerAssetTask method to batch import meshes and render them when needed, when rendering I get type BABYLON.TransformNode, I don’t know how to set impostors for these meshes, is there any code sample or tutorial?

Let me add @Cedric for this part

You have to check in your transform hierarchy which one is the mesh.
Usually, the first transform node is the root node and along the children hiearchy, there are the meshes.

Did you try to access loadedMeshes from ContainerAssetTask?