UmbralRaptop changed the topic of #principia to: READ THE FAQ: http://goo.gl/gMZF9H; The current version is Fano. We currently target 1.3.1, 1.4.x, 1.5.1, and 1.6.1. <scott_manley> anyone that doubts the wisdom of retrograde bop needs to get the hell out | https://xkcd.com/323/ | <egg> calculating the influence of lamont on Pluto is a bit silly…
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<N9_Gaming> Hello! Never used this site before.
<N9_Gaming> I wanted to ask about a bug I've discovered, not game crashing but peculiar none the less. With Principia installed, aircraft such as a helicopter are pulled un-seperatably to the surface. Has anyone encountered this?
<N9_Gaming> Something probably easier to answer, is there a way to download previous versions of the mod? I'd like to test this with different releases.
<N9_Gaming> Can confirm the issue is still happening with version Εὐκλείδης (had it downloaded from when it released) there's got to be a way to make Principia not handle things in the atmosphere I'm thinking.
<N9_Gaming> I will keep my eye on Principia because I absolutely LOVE using it, but aircraft shoved into the ground is kind of a deal breaker. Other than that, LOVE the frequent updates to this mod. Looking forward to the next ones (:
<egg> hi N9_Gaming
<N9_Gaming> Greetings!
<egg> mostly aircraft work
<egg> (we took care of handling stock aerodynamics as well as they work, and FAR behaves compatibly with us)
<egg> I suspect your helicopter part is doing something wrong, maybe adding a force to a rigidbody directly instead of via Part.AddForce
<N9_Gaming> I suspected as well too, however it flies perfectly fine if Principia is removed.
<egg> yes that is what I am saying
<egg> > adding a force to a rigidbody directly instead of via Part.AddForce
<egg> if you do that, then, in the presence of Principia, that force will not be applied
<N9_Gaming> Hmmm possibly!
<egg> because net nonconservative forces (engines, aerodynamics, etc.) must be communicated to Principia *somehow*
<egg> since Principia integrates the motion of your craft as soon as it leaves the ground
<egg> this works correctly with engines, with FAR aerodynamics, with stock aerodynamics
<N9_Gaming> With the bug I am encountering, the heli does in fact provide thrust, it will move laterally, but it is stuck to the ground for some reason. (20 second vid displaying this incoming)
<kmath> YouTube - Principia glues aircraft to the ground?
<egg> (FAR aerodynamics goes through the same path as egines, stock aerodynamics through a dedicated path that we handle specifically)
<egg> I saw your video already
<egg> again, it will provide a force when it is on the ground, because there we do not handle it
<egg> so the gluing-to-the-ground thing is consistent with that
<egg> where does the rotor part come from
<N9_Gaming> Airplane Plus mod
<egg> do they have code on github or somewhere that I can see?
<N9_Gaming> I shall look
<N9_Gaming> It doesn't appear so.. only forum.ksp, spacedock, and curseforge
<egg> ah, it uses firespitter
<N9_Gaming> Indeed
<egg> and firespitter does AddForceAtPosition
<egg> that's your problem
<N9_Gaming> Hmmmmmmm
<egg> forces should be applied with Part.AddForceAtPosition, not RigidBody.AddForceAtPosition
<egg> FAR does that, engines do that, etc.
<egg> cc ferram4
<N9_Gaming> Simple .cfg file fix? or do you suppose if I install FAR it will work then?
<egg> no, how the hell would you fix the C# by poking at the CFG
<N9_Gaming> Beats me XD
<egg> it's effectively a firespitter bug (or at least something that will hamper its compatibility with other mods), complain to the firespitter dev
<N9_Gaming> Thank you for narrowing this down, I would have never gotten here without ya.
<egg> e.g. that first part.gameObject.GetComponent<Rigidbody>().AddForceAtPosition should be part.AddForceAtPosition
<egg> 1.2.x introduced the latter, which makes it possible for other mods to see all forces that are being applied
<egg> which Principia needs, lest they be ignored
<N9_Gaming> If I avoid firespitter engines/rotors which have 'rigidbody' instead of 'part' I should have no problems then for now
<egg> yeah, AJE engines work fine
<N9_Gaming> Cheers! This is good news
<egg> and wings with FAR work fine as well
<egg> I enjoy flying planes in KSP, and I don't uninstall principia for that :-)
<N9_Gaming> Yup I can confirm I've never had any issues with Principia besides the helicopter rotors XD
<N9_Gaming> Have no fear I have multiple installs and this is the first one I've had any issue haha
<N9_Gaming> Very happy I can specifically narrow down what's happening here now ^-^
<N9_Gaming> I'll head off now, thank ya again!
<egg> I'll reply to the forum so this isn't stuck in some IRC log
<egg> and possibly CC the firespitter dev on it
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