Can we retrieve all currently predicted orbit patches?

[ColJay]

Looking to validate some return flight path predictions, so i'm trying to retrieve the orbit patch post SOI change. EG - parking orbit around the Mun - add manuever node for a hyperbolic exit of the Mun soi back into Kerbin. The game shows the expected orbit around Kerbin - i'm trying to get those details directly.

I think the original KOS allowed orbit:next_patch on any orbit object. I was wondering if there's anything similar? I've tried the manuecver, expected_orbit and orbit_patch - but these only deal with the current orbit pre and post manuever node.

Thanks!

[untoldwind]

The internal handling of maneuver nodes has changed quite a bit from KSP1. Additionally it looks like that there are some preparations for true n-body orbit types ... most likely for the future, but maybe one day it would be possible to park a telescope at the L2 Lagrange point of the Mun ... In lack of a better technical term this makes the API a bit wonky.

After some experiments I came up with the following changes:

• There are four additional field on Orbit:
  • start_transition, end_transition representing the patch transition type at the start/end of the orbit
  • previous_patch, next_patch to access the previous/next patch (both are Option<Orbit>)
• There is an additional field trajectory on Vessel:
  • This contains all orbit patches of the current trajectory of the vessel.
  • This does not take maneuvering nodes into account. I.e. vessel.trajectory represents where the vessel will end up continuing it current course without intervention.
• To access the planed trajectory if all maneuvering nodes are executed successfully, there is a vessel.maneuver.trajectory field containing all the orbit patches
  • This list will always start after the first maneuver node.
  • I.e. if there are no planed maneuver nodes this list will be empty.

You can try this out with this pre-release: https://github.com/untoldwind/KontrolSystem2/releases/tag/v0.5.1.3 (probably needs a bit more testing)

[appenz]

Awesome, and makes transfers between celestial bodies vastly easier.

[untoldwind]

This is now part of the 0.5.2 release. I also tweaked the vessel.maneuver.add and vessel.maneuver.add_burn_vector methods to support multiple maneuver nodes, i.e. the second node should now be on the orbit created by the first and so one (hopefully)

[ColJay]

Amazing work dude. Very impressed with the speed you can turn things around. Will crunch some numbers and give it a whirl - thanks again!!

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