add annotations to pdf

Adding 3D Label Annotations into a 3D PDF at Generation Time

How to add 3D Label annotations in a 3D PDF at generation time (GUIDE AND VIDEO)
Most 3D PDF generation tools do not provide part labels and annotation, and the majority of 3D model file formats don’t provide for 3D annotations either. Adding 3D labels is sometimes possible by hand placing and adding markup, but generating labels directly from an easy to use file format […]