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Author Topic: [Suggestion] Being able to go back in time  (Read 397 times)

kao16

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[Suggestion] Being able to go back in time
« on: August 23, 2017, 08:04:05 PM »
Hi, im new to the forum although i've had universe sandbox for about 2 years. I've always wondered if it is possible to implement a feature to not only stop the simulation but also go back in time through it

For example in the supernova simulation i would love to stop and go back to the time it actually explodes. I think it would be a very interesting feature for users that want to buy the game too.
Would you like to see it in the future?

SyzygyΣE

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Re: [Suggestion] Being able to go back in time
« Reply #1 on: August 23, 2017, 09:37:08 PM »
It's simply impossible to simulate the universe in reverse through conventional methods. That's just the way physics works. This has been suggested before, but a dev has stated here that it is currently not something they are actively working on.

emarksmi

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Re: [Suggestion] Being able to go back in time
« Reply #2 on: September 09, 2017, 02:44:58 PM »
I was thinking bout this as well, until I thought about what I was really asking for.  Essentially, you are running the simulation backwards which means reversing every velocity, spin rate, etc.  The result wouldn't really be backing up in time at all but a new simulation starting from an arbitrary point.  The more I thought about it, the more pointless it became.

Jar

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Re: [Suggestion] Being able to go back in time
« Reply #3 on: September 11, 2017, 03:35:31 PM »
Essentially, you are running the simulation backwards which means reversing every velocity, spin rate, etc.  The result wouldn't really be backing up in time at all but a new simulation starting from an arbitrary point.  The more I thought about it, the more pointless it became.
We actually just added a feature that will do exactly as you described, reversing the velocities, rotations, and time. It will likely be in our next update. It may not be what most people will expect with a "Reverse Time" feature, in that it will indeed be a "new simulation" as SyzygyΣE suggested, and things like collisions won't be reversed. But we still think it's an interesting experimental tool, and it does work well for simulations of timed events, like the eclipse.

emarksmi

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Re: [Suggestion] Being able to go back in time
« Reply #4 on: September 11, 2017, 04:12:25 PM »
But we still think it's an interesting experimental tool, and it does work well for simulations of timed events, like the eclipse.

Excellent!  I can think of other places where it might be useful to be able to reverse the simulation and see what happens (running a 3 body problem backwards, for example).