Install 3dldf-doc by entering the following commands in the terminal:
sudo apt update sudo apt install 3dldf-doc
3D drawing with MetaPost output -- documentation
GNU 3DLDF implements an interpreter for a METAFONT-like language for three-dimensional drawing with MetaPost output. . GNU 3DLDF is mainly intended to provide a convenient way of creating 3D graphics for inclusion in TeX documents; it can also be used for creating animations, which can contain text typeset using TeX. . This package contains the documentation for 3DLDF.