Some tools

When talking about VR there are some tools that can be used.
As I said in previous posts, it depends on the momment; the end user could require different tools as it's not the same to require just a tool to check the work done during the design, as the one to merge the whole project into one big model, etc...
During the first phase of design, the engineers have their own tools that dependant on their design tools and others that are more independant and support quite well different file formats.