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…
<queqiao->
⟨kaborl⟩ Why suborbital trajectory with clear collision on surface results in this trajectory pattern in ECEF? What's the logic behind it? Thanks.
<queqiao->
⟨test_account9540⟩ Principia doesn't recognize collision unless the trajectory goes somewhere near the center of the planet. So it continues the trajectory as if nothing happened
<queqiao->
⟨kaborl⟩ So it's like if it's trying to orbit the center of the planet somehow?
<queqiao->
⟨test_account9540⟩ yes, but actually, now that i look at it, there is a collision marker
<queqiao->
⟨kaborl⟩ * the trajectory that I'm seeing is
<queqiao->
⟨test_account9540⟩ apparently flight plan trajectories and prediction trajectories (shown here) work differently with regard to collisions?
<queqiao->
⟨test_account9540⟩ because flight plan trajectories work like i wrote before
<queqiao->
⟨kaborl⟩ Maybe they do, but in order to "help" during planning the "outgoing trajectory" (what happens after the collision) is still projected.
<queqiao->
⟨test_account9540⟩ There was some work to make flight plan trajectories better recognize collisions with the surface (not just the center of the celestial). Not sure what is the current status 🤔
<queqiao->
⟨test_account9540⟩ +also not sure why flight plan and prediction works differently
<queqiao->
⟨kaborl⟩ Right, anyway. The answer helped me so thanks.
<queqiao->
⟨hyn2944⟩ hello, which version of pricnipia should I install for a fresh rp1 game? The installed ksp is 1.12.3, and there are principias available for 1.12.2 and 1.12.5
<queqiao->
⟨siimav⟩ Latest
<queqiao->
⟨egg⟩ The readme says
<queqiao->
> 1.12.2 to 1.12.5This is English, not Japanese; it does not mean « 1.12.2 and 1.12.5 ».
<queqiao->
⟨siimav⟩ Hmm, why .2 and not .0 or .3? 🤔
<raptop>
ＫＳＰ 一。一十二。二と一。一十二。五
paculino has joined #principia
<queqiao->
⟨egg⟩ > Principia doesn't recognize collision unless the trajectory goes somewhere near the center of the planet.This has not be true since Jordan.
<queqiao->
⟨egg⟩ This has not been true since 掛谷.
<queqiao->
⟨egg⟩ Indeed, there _is_ a collision marker on the screenshot shown, where the predicted trajectory intersects with the ocean.
<queqiao->
⟨egg⟩ The computation of the trajectory happens prior to collision detection, and we do not clip the trajectory at the first collision, so the trajectory is drawn as if there were no surface, and then the collision is displayed where it would happen (assuming no atmosphere).
<queqiao->
⟨(ᴇxᴘᴇʀɪᴍᴇɴᴛᴀʟshells)⟩ would it not be 十二？
<queqiao->
⟨egg⟩ We could clip it for display (in this frame). That would probably be less confusing and noisy.
<raptop>
er, right, it would.
<queqiao->
⟨clayel⟩ indeed
<queqiao->
its quite confusing when principia insists that i can go right through the moon