Flight Docking and Undocking Causes SAS/RCS to Turn Off.

[Anth]

KSP2 Version: 0.1.0.0.20892
KSP2 Version: 0.1.1.0.21572
KSP2 Version: 0.1.2.0.22258
Operating System: Windows 10
CPU+GPU+RAM: i9 9900K+3070ti+32GB
Mods Used: None

Important Information to Start With:

• The expected behaviors below might be an interim fix due to that craft priorities aren't a thing yet.
• Minor testing with 0.1.0.0 and 0.1.1.0 appear to have the same issues so not a regression as long as a 0.1.2.0 save is backwards compatible.

On Docking:
Expected Behavior:
Docked craft should maintain the SAS/RCS state of whichever craft has SAS/RCS on.
Observed Behavior:
After docking SAS/RCS are both off.

On Undocking:
Expected Behavior:
If the original craft has SAS/RCS on then on undocking both crafts should maintain SAS Stability/RCS states.
Observed Behavior:
One craft will lose SAS/RCS on undocking.

Video Evidence:
https://youtu.be/ulCGmmh2fNQ (22 Seconds)

Save File:
https://www.dropbox.com/s/l5b4efhw6qb5nne/DockUndockTestSave.zip?dl=0

Edited July 12, 2023 by Anth12

[Rubenio]

Reported Version: v0.1.3.2 (latest) | Mods: none | Can replicate without mods? Yes 
OS: Windows 11 Pro 64-bit (10.0, Build 22621) | CPU: Intel(R) Core(TM) i7-10700F CPU @ 2.90GHz (16 CPUs), ~2.9GHz | GPU: NVIDIA GeForce RTX 3060 | RAM: 49152MB RAM

 

When two vessels are undocked, both end up with their SAS turned off - regardless of whether there is a Kerbal onboard or not.

The same happens when the vessels are docked - the combined ship has SAS turned off.

I think it's OK to have RCS automatically turned off, but losing SAS when undocking sends the inactive ship away with some force and it would be useful to keep the ship under control

Here is a short video to illustrate:  https://imgur.com/y4PnIqU

Also, note the force of undocking is pretty large despite the docking force setting set to 10% - Shouldn't this work both ways?

 

Included Attachments:

SAS_Docking.mp4

Edited July 12, 2023 by Anth12

[Anth]

@Rubenio Merged your bug report with this one.

[Filed.Teeth]

I know in KSP1 one craft will lose SAS upon undocking. which is slightly annoying, but you also don't have freshly undocked craft getting tossed around as soon as they decoupl.

[Anth]

26 minutes ago, Filed.Teeth said:

I know in KSP1 one craft will lose SAS upon undocking. which is slightly annoying, but you also don't have freshly undocked craft getting tossed around as soon as they decoupl.

And what makes it worse is the lack of SAS. I have had some crafts jack knife as they separate. Not great.

[Skystorm]

Sometimes the craft will also lose its control point if it had multiple when undocked.  Both craft should retain their original control from here locations and orientations when undocking and sas setting (or at least stability assist if it wasn't the control point).

For example, a space station with SAS enabled oriented in the Normal direction with a starship attached to a docking port.  The space station is the control point (control from here location).

When the space station undocks, the space station retains its control point and remains with SAS enabled, oriented in the Normal direction.

The starship when undocked, because it was not the control point, should only have stability assist enabled to keep it steady and facing towards the docking port to which it was connected.  It should not inherit a SAS orientation because its control point will likely have a different front-facing direction than the vessel or station to which it was docked and would cause it to immediately change its orientation upon undocking.

This can partially be accomplished by choosing to undock using the docking port attached to the vessel that should retains its control point and SAS configuration.  However, the vessel that was undocked has all SAS and stability assist turned off.

[DylanSP]

Can confirm for v0.1.3.2.