Mirror Reflection inside Smoke Domain, volumetric

Hi!

I’ll make it short:

Can’t figure it out how reflective item can mirror smoke INSIDE domain. I’m not good in internal engine, so maybe there is just simple solution for this.

Here is my problem. Mirror on the left is outside domain, mirror on the right is inside domain.


Any tip could be helpful. Maybe there is some other solution for this. I need this reflection pass for combining it with cycles render.