BabylonJS How to make an imported mesh to be transperent?

Hi there,

I am a total noob when it comes to Babylon but I am trying my best here :D.

I cannot find an example of how to make an imported mesh (using BABYLON.SceneLoader.ImportMesh )transparent.

I have played around with couple of examples with spheres and changing their alpha and sphere that have a texture assigned to them and then changing it to be transparent, but how does one do this when the file that you are loading using the importMesh is a Babylon file with all the textures, when I use mesh.material.alpha = 0.5, it makes the material transparent but the texture just goes white, I cannot see through it to the mesh behind it.