egg changed the topic of #principia to: Logs: https://esper.irclog.whitequark.org/principia | <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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<queqiao->
⟨justaregular911_58885⟩ Hello, is it possible to implement some sort of attitude control on unloaded vessels in Principia? Like its possible to orient vessels using the PersistantRotation mod such that they only point to the normal/bi-normal vectors, or they point towards a target body (like the Sun). It would be huge help for solar-powered vessels.
<queqiao->
⟨test_account9540⟩ Spin stabilize them
<queqiao->
⟨test_account9540⟩ But actually it doesn't matter because kerbalism remembers the last orientation and keeps it while the vessel is unloaded
<queqiao->
⟨test_account9540⟩ So you can wait until your tumbling unguided probe happens to point the solar cell to the sun, unload the vessel and it will be at 100% indefinitely
<queqiao->
⟨justaregular911_58885⟩ I haven't experienced that with Kerbalism.
<queqiao->
⟨justaregular911_58885⟩ But I was also asking because of a space station in LEO, that I want to always keep aligned to the surface (surface-radial out ig?)
<queqiao->
⟨test_account9540⟩ Now this is not possible, because the direction to the surface constantly changes
<queqiao->
⟨test_account9540⟩ You need to actively turn the craft with RCS or something to keep it aligned to the surface
<queqiao->
⟨justaregular911_58885⟩ Would it be possible to implement that sorta thing in Principia? like maybe use RCS fuel or sth but keep it aligned
<queqiao->
⟨justaregular911_58885⟩ cuz its a huge space station and takes a lotta time to rotate lol
<queqiao->
⟨test_account9540⟩ no, principia doesn't have any kind of automatic station keeping and it would be very difficult to implement
<queqiao->
⟨justaregular911_58885⟩ Hmmm ok
<queqiao->
⟨justaregular911_58885⟩ what about a kOS script then? do those work when the vessel is unloaded?
<queqiao->
⟨test_account9540⟩ no, kos scripts only work when the vessel is loaded
<queqiao->
⟨test_account9540⟩ unloaded vessel can't have engines fired in the first place
<queqiao->
⟨justaregular911_58885⟩ ok thanks
<queqiao->
⟨test_account9540⟩ I suppose if you put your space stations on an exactly circular orbit, and manage to give it just the right spin rate in the orbital plane that it always looks to the surface, and then somehow spin stabilize it to keep from wandering in the other two axis... then maybe it will keep pointing to the surface for a long time 🤔
<queqiao->
⟨test_account9540⟩ This definitely needs to be done with kos because no other tools can give the necessary precision
<queqiao->
⟨test_account9540⟩ Not sure it will hold up or some kind of perturbations will ruin the surface alignment anyway
<queqiao->
⟨justaregular911_58885⟩ that seems like a lot of effort just for keeping my space station aligned with the planet 😭 😭
<queqiao->
⟨pisslover72⟩ > we don't compute ALP themselves, only their valuesWhat do you mean by this?
<queqiao->
⟨sichelgaita⟩ One possible approach would be to compute the coefficients or Pnm(x) and plug various values of x. That's inconvenient because the coefficients become large and alternate in sign. Instead we compute Pnm(x) for a particular value of x by recursion on n and m. Please read the "Implementation considerations" section of the paper.