Setting the transparency mode doesn't matter,Have you ever encountered one before

mesh.material.transparencyMode = BABYLON.Material.MATERIAL_ALPHATEST;

Direct perspective from a long distance

Up close, you won’t be able to see through

The transparent objects are sorted and rendered from farthest to closest.

In your case, I think you want the icons+labels to be always on top, so you should assign them a renderingGroupId larger than the renderingGroupId of the meshes (which is 0 by default).

is this the security layout of a real life nuclear plant? holy shit if so lol

You should go check out the nuclear power plants in Little Japan