boolean architectural sections

when I use boolean operator to subtract a part of a building, the walls sectioned result without thickness, like paper sheets. Note that the A sub B generates good A object + strange triangles instead of the thickness of the walls. I use autocad and rhino for design and export in 3ds to c4d. I need a solution or a tutorial, thanx.

 

It's just suggestion. Try first untriangulate objects, after this use boolean...
Or by this link you can download free Better Boole plugin...

ftp://ftp.maxon.de/pub/r8/more/boole.zip

May be that can help you...

 

Maybe it's better I import object sectioned previously in rhino... or maybe my models are too complex... I've already used better boole but with poor results. I'll try to untriangulate. Than you.

 

Difficult understand problem without look to the scene...

 

Problem found: if I use .obj i/o no more triangles! I don't understand why but...