Thank you Klauss and Destiny. Finally I heard what I wanted
I understand now it can be made in almost all serious software. People who are able to create the whole 3D model in any of those software will be easy to make a virtual VR camera and create panos. That means it can be probably done by investors request for no additinal costs or just a small extra cost. That's perfect!
Now I know that when I completly finish my classified site, I can search for 3D modellers who use one of those software (and not something like google scretch up) and talk to him about a cooperation.
Destiny, no problem for the compass
I can make all my tours and later just add it. Make that when you find some free time. I am happy to hear you didn't forgeth about me.
BTW, you told me that you know many good modellers that can create unique models fairly cheap. Can you give me an estimation aproximatly, just to understand prices in the world. Than I will able to compare with offers I will find.
So, I can find the investor who want the 3D and he can give me CAD drawings made by his architect. The investor need only to choose a style from some samples. Than all other is choise of the modeller. So he can make the interior how he like, in the style the investor choose. The most important is to show the space, how will looks like once it will be arranged and furnished. The buyer can later do that as he want. The 3D is good also for the investor to help him to undertand the space and help him to make the interior.