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  1. Landed vessels are not managed by Principia, meaning they don't exist as far as Principia is concerned. So no, landed vessels will not have any impact on Principia's computation.
  2. Directions represent rotations, which should be multiplied. The addition of directions is supported but not well behaved as explained in the docs here https://ksp-kos.github.io/KOS_DOC/math/direction.html#operations-and-methods .
  3. I don't know the exact technical details, but at a rough guess the problem is with how the forces are being applied by KerBalloons. If the mod isn't applying forces with the calls Principia expects, the forces will "magically" disappear. As for why it rises a little bit off the ground: Whenever a vessel is landed, Principia doesn't control it all. Stock physics has complete control over it. Which is why the force gets applied to the vessel and it rises above ground. But as soon as it is off the ground, Principia takes over, the force disappears and the vessel comes down; and so you get the oscillations.
  4. That is a property of N-body physics and your inability to execute manoeuvres perfectly, not Principia. Issue #2400 https://github.com/mockingbirdnest/Principia/wiki/Installing,-reporting-bugs,-and-frequently-asked-questions#timewarping I don't see how that would make for an interesting enough gameplay to justify the effort required, but not really my expertise or place to say either way.
  5. So you just decided to call a mod a mess and spread misinformation based on the number of issues? Without even trying to see whether most of its functionality is affected or not?
  6. The download links are on github in the README.md file. Which means they are version controlled. Go through the history of the readme on github and you should be able to find the links.
  7. These are initial state files for use with RealSolarSystem https://drive.google.com/drive/folders/1iNlip4K66oaOQgPm7nDnpQxExuDmp6lu Some people like to play or simply want to explore RSS in more recent years, rather than 1951 with which Principia starts by default. And of course you can timewarp to whatever year you want to. But until the devs complete their work on #2400 and related issues, it is going to remain a bit painful the further from 1951 you timewarp. The folder linked above contains initial states every 5 years from 1950 to 2020. So the initial state file for 2010 gives you a game that starts on 2011-01-01T00:00:00 UTC. Replace the initial state file in the Principia/real_solar_system folder with the one you want. Keep in mind that this will only have effect on new saves, an existing save won't magically timewarp into the future or past because you changed that file. @eggrobin has done a cursory verification of the initial state files. But if you run into any inaccuracies, that's my responsibility, not his or @pleroy's.
  8. The stock spheres of influence do exist even with Principia, Principia just doesn't care about them. The stock science system uses those same SOIs for determining which experiments are available. In case of other planet packs, those limits are set by the respective planet packs, Principia doesn't meddle with it. And anyway - with or without Principia - altitudes don't depend on the SOIs at all. Altitude is simply (distance from body center minus body radius). Conceptually, an altitude with respect to Mun still exists even if you're in the SOI of Jool.
  9. kOS and Principia don't do anything special for each other. So they are as compatible with each other as any two random mods are. You will need to be more specific than that to get help. What kind of problems?
  10. Download the zip - links are on both the first post of this thread and the README on github. Extract the zip and copy / merge the folder like any other mod. If you have never installed any mod before, read the thread linked by Entropian.
  11. Anyone. One of each INFO, WARNING, ERROR and FATAL log is created for every KSP session. The name contains the date and time when the log was created (alternatively you can also sort the folder by date modified). Also, go through the troubleshooting section of FAQ on github.
  12. Check the history of the README.md file on github, you should be able to get the links there. But note that bug fixes and new features are not ported to older versions, so you won't get them.
  13. Check the ModuleManager documentation, it does allow checking for presence of modules among many many other things.
  14. That's an extremely unhelpful report. It's like saying, "I was walking down the road and now my arm is bruised, what's going on?" I don't know, a hundred different things, maybe you hit a power pole with it or a car drove over it, or it was bruised all along but you just noticed... Nobody can and will help you unless you properly describe what you were trying to do, how that thing didn't happen the way you expected, what went wrong and, if needed, provide the logs.
  15. KSP itself treats asteroids just like vessels. Your rocket can grab onto them and move them around anyway you like, so Principia also needs to treat them like vessels. Actually I didn't even need to type that, I could have just linked this: Principia wiki regarding timewarp
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