Transparent wall in babylon sandbox

In blender all ok, but when I import to babylon - some strange opacity effects. Flipping normal and transparency overlap didnt help. Any ideas guys?

Try to change alpha mode of problem material through Inspector.

Thank you.

Did it help?

Actually no) But thank you anyway)

If you could share your model it would be much easier to see not guess.

Sure, thanx. DropMeFiles – free one-click file sharing service

For me the problem happens in blender too. Setting transparency mode to opaque fixes it:

Set transparency mode to opaque or alpha test.
The building is better.

The other problem is metallic/roughness texture. Currently it make the whole building look like metallic.

If I delete this texture, the result is also better visually.

But actually you need to correct this texture so it would have more reflections on windows and almost no reflections on concrete.

Thank you very much, i just esport scene from blender to fbx, then open in 3dsmax and export in gltf back) The result is similar to your without rough and metall textures.