I exported a dxf from QGIS with buildings and topography, i saved as a dwg in autocad, then I imported this file .dwg file in Rhino and used a script in grasshopper to extrude the buildings and another one to do the topography. The problem is when I try to render this elements with Enscape or V-ray there is a bug in the objects and everything looks like the photo. (there is not a superpostion of surfaces)
I think there is problem with the file that came from QGIS, because when I draw something in another autocad file everything works. But with this file that came from Qgis there is always this bug. Does somebody know the solution please???