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eggrobin

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About eggrobin

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    Sr. Spacecraft Engineer

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  1. Calling Part.Add(Torque|Force(AtPosition)?) is the only way for a mod to apply a net force to a vessel in the presence of Principia. Calls to RigidBody.Add(Torque|Force(AtPosition)?) will have no net effect on the vessel (though they may deform it). Mods that use RigidBody.Add(Torque|Force(AtPosition)?) are Principia-incompatible.
  2. For the new moon (lunation number 261), the new release (Gödel) is out. Support for KSP 1.11.1 has been added. Principia is localized in simplified Chinese. Thanks to @CindyRIng for this significant contribution, and to @Zaikarion for helping with linguistic questions. Some crash-inducing bugs have been fixed. See the change log for more details. For the convenience of our Chinese users, the binaries can be downloaded either from Google Drive or from 腾讯微云.
  3. They are not, which is why the installation process requires installing the right system dependencies metioned (and, for Windows, linked to) in the FAQ.
  4. Please don’t bundle Principia. Instead direct users to the README.md page on GitHub. There are several reasons for that: Principia has its own (system-level and platform-specific) dependencies, which you cannot bundle without a platform-dependent installer: if Principia is provided in a bundle, it will simply not work out of the box; we want users to know where the concepts & FAQ pages can be found, as well as the specific bug reporting procedures, and the readme will tell them about that—Principia is complicated enough that if users get it as part of a bundle, there will
  5. For the new moon (lunation number 260), the new release (Germain) is out. Support for KSP 1.11.0 has been added. The orbital analysis of the final trajectory is now available in the flight plan, making it possible to plan accurate orbital insertions and corrections. See the change log for more details. For the convenience of our Chinese users, the binaries can be downloaded either from Google Drive or from 腾讯微云.
  6. A notice to all Principia users: DO NOT use the « fix » provided in the above post. @100055 you have completely misunderstood how the axial tilt configuration works, and therefore your so-called fix is incorrect. All orientations of the planetary axes are given by right ascensions and declinations in the International Celestial Reference System (ICRS), whose reference plane is the mean equator of the Earth at the standard epoch J2000; in particular, this means that the axis of the Earth has a declination of 90°. This is the convention used by the International Astronomical Union, and
  7. For the new moon (lunation number 259), which is a total eclipse, the new release (Гельфонд) is out. The orbit analyser now provides a short description of the current orbit, e.g., “highly eccentric semisynch. Earth orbit”. The trajectory colours can now be configured, thanks to a contribution from @Flibble (#2816). See the change log for more details. For the convenience of our Chinese users, the binaries can be downloaded either from Google Drive or from 腾讯微云.
  8. For the new moon (lunation number 258), the new release (Гельфанд) is out. Performance of operations based on iteration over trajectories has been improved thanks to a contribution from @rnlahaye. See the change log for more details. For the convenience of our Chinese users, the binaries can be downloaded either from Google Drive or from 腾讯微云.
  9. [Note: this was clarified over Discord; answering the questions asked here for posterity] Your system is either unstable, or doing things too quickly for the default integration settings (« unstable » is just a special case of that, where close encounters happen too quickly; Principia doesn’t (yet) care about orbits nor whether things remain on them). US2 tends to be an unreliable predictor of what happens to a solar system with Principia (probably because of different conventions for the representation of the initial state, possibly of its choice of numerical methods and timesteps ).
  10. For the new moon (lunation number 257), the new release (Gauss) is out. A bug that would occasionally lead to crashes when parts exploded has been fixed (#2716). See the change log for more details. For the convenience of our Chinese users, the binaries can be downloaded either from Google Drive or from 腾讯微云.
  11. For the new moon (lunation number 256), the new release (Gateaux) is out. Support for 1.10.1 has been added. Note that the behaviour of Principia in the presence of comets is hard to test; users who encounter problems when comets are present are invited to report bugs. See the change log for more details. For the convenience of our Chinese users, the binaries can be downloaded either from Google Drive or from 腾讯微云.
  12. If we look for a gravity model for Eeloo, this means Eeloo is present. If Eeloo is present with RSS, this means RSS is improperly installed.
  13. For the new moon (lunation number 255), the new release (Galois) is out. It is now possible to insert and delete manœuvres in the flight plan; in particular, this makes it possible to insert correction manœuvres after rebasing. Manœuvres can be collapsed and expanded, making it easier to manage flight plans with many manœuvres. A bug involving incorrect thrust when planning RCS manœuvres was fixed. Thanks to @Flibble for contributing this fix. See the change log for more details. For the convenience of our Chinese users, the binaries can be downloaded either from Goo
  14. The stock tidal locking flag never really works in the presence of Principia, and leads to aberrant spin and de-spin; Principia thus always disables it. It should be noted that, in a non-Keplerian world, finding the correct rotation period for tidal locking is tricky. As you have seen in the orbit analyser, satellites have three different orbital periods, none of which are equal to the osculating period (the period of the stock Kepler orbit at a given instant), and the same holds for a celestial body. Since we do not model pressions of the axes at this time (the rotation axis is fixe
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