If you want to build a 3D Sans or Undyne the Undying fight, the raw logic frequently lives on Pastebin.
The sharing of Undertale 3D boss battles scripts on platforms like Pastebin has had a significant impact on the community: Undertale 3d Boss Battles Script Pastebin
Some popular Undertale 3D boss battles scripts include: If you want to build a 3D Sans
3D doesn't change the heart of Undertale (pun intended). A good script tracks sparePoints and prevents the boss from dying if you are going for a Pacifist run. Undertale 3d Boss Battles Script Pastebin