[WIP][1.8.1, 1.9.1, 1.10.1, 1.11.0–2, 1.12.2–5] Principia—version Καραθεοδωρή, released 2024-04-08—n-Body and Extended Body Gravitation
The source code is available on GitHub under the MIT license.
Abstract
This mod aims to replace KSP's unstable physics integration with a higher-order symplectic integrator, adding n-body Newtonian gravitation in the process.
Acronyms
Documentation and download
Principia is not built in the same way as most other mods (most of it is native code, with a thin C# interface layer), so that compatibility issues may arise depending on the platform.
Binaries are availabl
Summarizing a discussion on IRC: this is a symptom of forces being applied using RigidBody.AddForceAtPosition, instead of Part.AddForceAtPosition. The latter (added in 1.2.x) allows other mods (such as Principia) to inspect the forces that were added; Principia needs that in order to be able to integrate the overall motion of the vessel; any forces added via the former will have no net effect on the vessel.
Note that rocket engines, AJE jet engines, FAR aerodynamic forces, etc. use Part.Add
