New glass models of the Vactubes (just glass variants).
The models will have visible glass inside and outside.
They won't override the normal models or materials.

The .vpk file if for sharing the map with other players (so they don't have missing models). Always put it to Steam\steamapps\common\portal 2\portal2\addons

Attention: Just use in situations you really need inside glass, because the double count of polygons for the inside!

File Name: VacTube_Glass_BothSides2.7z
File Size: 100.37 KiB

Click here to download Vactube Glass both sides

&

Actually decompiling works with Cannonfodder's mdl decompiler, the problem is getting it to recompile (and by that I mean it refuses to, period, under any curcumstances.)

Sorry, could find any version with working decompile. It always crashes if I try to decompile. Otherwise I would have done it this way.

Edit: Oh sorry I made a major mistake: I have to start StudioCompile with Administrator!

Update: Now there are no bad hexed models, now you can download new models with polygons in- and outside. So you will have phong and envmap reflections inside too. No .vtx errors with VRAD.

Why not to have models with polys outside and $nocull 1 on the material?

That was my first try too, but lighting would be just for one side and shaders too.
It looks better without nocull 1 in this case.

I trust your wisdom since I'm lazy to try it myself
thanks