3DS Max. It has bugs that have been unfixed for 20 years... I make models for Microsoft Flight Simulator where it is the only software that can export models co

3DS Max. It has bugs that have been unfixed for 20 years... I make models for Microsoft Flight Simulator where it is the only software that can export models correctly; there is an unsupported Blender exporter, but I'm not enthusiastic about learning that product from scratch; it has many of its own idiosyncrasies.