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Bug #25761

Time Warp changes orbit

Added by KerbalKiller2000 almost 4 years ago. Updated over 1 year ago.

Status:
New
Severity:
Low
Assignee:
-
Category:
Physics
Target version:
-
Start date:
07/10/2020
% Done:

0%

Version:
Platform:
Windows, XBoxOne
Expansion:
Core Game
Language:
English (US)
Mod Related:
No
Votes:
Arrow u r green
Arrow d r red

Description

When time warping (in career mode), the orbit of a vessel changes. Time warping at 5x speed causes the orbit to change a couple hundred meters, while time warping at maximum (100,000x) causes a vessel to go from low-Kerbin orbit to a suborbital trajectory. It doesn't matter if it's auto-time warp or manual time warp. I have had it happen a few times on science mode, but it has not happened as much as when on career mode. No mods have been installed.

Steps to replicate:
1. Launch a vessel in to space in career mode (happens more often when in orbit).
2. Manual time warp or auto-time warp to a certain point while watching apoapsis or periapsis height.
3. Orbit changes.

History

#1 Updated by KerbalKiller2000 almost 4 years ago

I will add screenshots if needed.

#2 Updated by KerbalKiller2000 almost 4 years ago

  • Subject changed from Time Warp changes orbit in career mode to Time Warp changes orbit
  • Description updated (diff)

#3 Updated by Jognt almost 4 years ago

KerbalKiller2000 wrote:

When time warping (in career mode), the orbit of a vessel changes. Time warping at 5x speed causes the orbit to change a couple hundred meters, while time warping at maximum (100,000x) causes a vessel to go from low-Kerbin orbit to a suborbital trajectory. It doesn't matter if it's auto-time warp or manual time warp. I have had it happen a few times on science mode, but it has not happened as much as when on career mode. No mods have been installed.

Steps to replicate:
1. Launch a vessel in to space in career mode (happens more often when in orbit).
2. Manual time warp or auto-time warp to a certain point while watching apoapsis or periapsis height.
3. Orbit changes.

I too encountered this problem. I'm used to orbit lines changing during warp being purely cosmetic, but lately I keep having the orbit being changed permanently.
I've gotten into the habit of waiting for the orbit numbers to stop changing after cutting throttle, sometimes takes longer than others (several seconds of orbit numbers changing slightly without thrust input).
Haven't had my orbits changed yet since, but I haven't tested enough to know whether it actually has an impact.

#4 Updated by Entropian almost 4 years ago

I'm having this problem in 1.10.1 as well. I can't reproduce it though, but I think the change in orbit has increased in severity.

#5 Updated by six1niner almost 4 years ago

  • Version changed from 1.10.0 to Xbox One - Enhanced Edition 2020-06-23 Patch 12
  • Platform XBoxOne added

Same issue here. After performing transfer burn to Duna from Kerbin, using "warp to next manuever" for mid-course inclination change, changed an encounter to falling very short as though I only performed 3/4 of the transfer burn. Definitely not just visual as I continued my path to confirm. Note:"warp to.." used max time warp. Bug doesn't happen consistently, but has happened more than once to me.

#6 Updated by six1niner almost 4 years ago

It doesn't seem to happen if I slowly increase time warp, almost as though the calculation from real time to max warp is wrong.

#7 Updated by six1niner almost 4 years ago

Been playing since Making History. Bug started with last patch afaik

#8 Updated by KerbalKiller2000 almost 4 years ago

  • Version changed from Xbox One - Enhanced Edition 2020-06-23 Patch 12 to 1.10.1

#9 Updated by Entropian over 3 years ago

Ok, I have more information. The bug only happens if you suddenly shift timewarp up or down, as six1niner said. As far as I know, this is only achievable using mods, although the bug exists in the stock game. Another forum thread was started on the issue here: https://forum.kerbalspaceprogram.com/index.php?/topic/196777-my-orbit-changes-when-i-use-time-warp/

#10 Updated by Jognt over 3 years ago

Lost my first Eve mission because I used "Warp to Maneuver" to warp to my 105km Pe burn to circularize and found myself to be a hot flaming mess inside the atmosphere.

If any developer can share insight into the workings of KSP's time warp and what sort of code is run when activating it, then that would probably help with reproducing this. Hard to debug if you don't have access to the code.

#11 Updated by just_jim over 3 years ago

I've been trying, but I have not been able to reproduce this one yet. Not saying it's not happening. Just something more going on... Is this happening in stock games, or modded? or both? That's important
Can someone attach a saved game where this was happening, please?

#12 Updated by KerbalKiller2000 over 3 years ago

Time warp affected my orbit when I didn't have any mods installed, and it still happens after I installed Kerbal Engineer.

#13 Updated by KerbalKiller2000 almost 2 years ago

This issue seems to have been resolved; it is no longer occurring in my save files.

#14 Updated by OhMaiCaptain over 1 year ago

It definitely is still happening, happened today after doing an intercept burn from LKO to the Mun. When warping to go there I ended up at my maneuver to orbit the mun, only was still around Kerbin, only 2/3 distance to the mun, and on the descent back to Kerbin.

Most of the time it happens for me after burning from LKO to intercept Eve or Koho, and have another maneuver set up to warp to. Initiating the warp, there's a chance the ship will never leave Kerbin SOI.

This is version 1.12.4, both DLCs, only mod is Kerbal Engineer Redux. In Hard games, this causes you to either fail a mission because you lose precious dV needing to burn again, or shut down the game and reload the persistant save.

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