OFF 3D File Viewer is a VSCode Extension that automatically opens .OFF files in a custom 3D viewer. Its written in Typescript and uses ThreeJS to render natively in the webview, so is fast and lightweight. Unlike previously available options, is not intended for modifying large point clouds, but rather allows quick viewing of surface meshes.
I built this tool to help view OFF files when working on computational geometry problems. Though since mostly switching to neovim im not sure why i'm making stuff for VSCode...