Probably without knowing, everybody has powerful 3-D viewing software in the computer inside the free program Acrobat DC!
With this possibility you can view how a model is built-up in assemblies, sub-assemblies and parts.
You can hide or view components, move, rotate and zoom and even look inside a model!
Furthermore you can choose different render modes like an outline or transparent model.
Let's use this model of the Argo ATV to demonstrate how to open a 3-D PDF first.
In the menu bar, go to Opening 3D-PDF in Acrobat DC