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Thread: Space Flight...Physics correct?

ShrewLWD
Fri Nov 05, 2004 9:00 am
#1



Hey all,
I'm curious about the flight physics when flying in space.


For example, when I fly towards say, some debris (either already in game, or from a recently destroyed enemy) or a large space station, then make a radical turn away from it, it appears as if I'm turning on a dime, but only in relation to that object. If I am tracking another spacecraft, I am limited by turn ratios, etc. If the physics of tracking that ship are true, then stationery objects appear to be moving with me.


Now, I do understand that inertia is a phenomenon of gravity, so there isn't (or shouldn't be) inertia in space. *Edited out. Didn't want the discussion to narrowly focus on gravity=inertia (especially since I was sick the day they discussed this in physics 101. heh!)


Therefore a radical turn is possible given turns are made by thrust changes, not flaps or ailerons, and that there is no air friction it has to push through.


Is anyone else seeing this, or have an opinion?


BTW, I am having a blast... err, blasting around in space! So this is no gripe session, just curious if this is a relatively accurate rendering of space, or a limitation of projecting a 3D world into a 2D space.


Anyone? Bueller?

Message Edited by ShrewLWD on 11-05-2004 10:07 AM

Message Edited by ShrewLWD on 11-05-2004 03:13 PM

Yals
Fri Nov 05, 2004 9:07 am
#2

Inertia has nothing to do with gravity....



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Hollow
Fri Nov 05, 2004 9:12 am
#3






Yals wrote:
Inertia has nothing to do with gravity....






Correct. Inertia is the result of the momentum of mass and doesn't like to change direction. Whats in motion stays in motion.


But to answer your question....ehh...lets not bring real world physics into the Star Wars Universe, they don't apply. But hey! It's a lot of fun!

Message Edited by Hollow on 11-05-2004 10:15 AM

Noghrilover
Fri Nov 05, 2004 9:19 am
#4


Of course it's not correct, but Star Wars isn't supposed to be. If it was correct, every time our engines were on, we'd be accelerating. However, we go at a constant speed of whatever our throttle is set at. But, why bother? If physics held completely true here, it would be quite boring...and I love physics.


P.S. Inertia is not a phenomenon of gravity.

Message Edited by Noghrilover on 11-05-2004 11:21 AM



~Scnigey Wesley~
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Dragonbanisher
Fri Nov 05, 2004 9:32 am
#5

If you were in beta when they had the whole extreme sliding in, that made the game seem more "Realistic" but it really sucked. If you were in an interceptor or A-wing or any other fast craft you would have to brake 1k meters out before the target or end up sliding 1k past it...



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FalinMor
Fri Nov 05, 2004 2:12 pm
#6






ShrewLWD wrote:


Hey all,
I'm curious about the flight physics when flying in space.


For example, when I fly towards say, some debris (either already in game, or from a recently destroyed enemy) or a large space station, then make a radical turn away from it, it appears as if I'm turning on a dime, but only in relation to that object. If I am tracking another spacecraft, I am limited by turn ratios, etc. If the physics of tracking that ship are true, then stationery objects appear to be moving with me.


Now, I do understand that inertia is a phenomenon of gravity, so there isn't (or shouldn't be) inertia in space. Therefore a radical turn is possible given turns are made by thrust changes, not flaps or ailerons, and that there is no air friction it has to push through.


Message Edited by ShrewLWD on 11-05-2004 10:07 AM




Inertia has nothing to do with gravity, it has to do with mass. Even when there's no gravity, it takes more energy to accellerate or turn a body with more mass than one with less.


That said, no the flight model in JTL is nothing like real-life space flight... thank goodness. They had a more realistic model during beta, and it just wasn't fun. It was more like ice skating than flying.


Falin


ShrewLWD
Fri Nov 05, 2004 2:19 pm
#7

Hey guys,


Thanks for all the insightful info (and the corrections... my knuckles are duly whacked, thank you!)


You mentioned the Suspension of Disbelief,... my message originally had that thought in there too, but then I realized that disbelief comes from something opposite of belief, and if the belief itself is flawed, the disbelief becomes flawed too. So I thought, lets get the 411 first, set the belief, then apply the SoD.


ikeprof
Sat Nov 06, 2004 1:40 am
#8






Dragonbanisher wrote:

If you were in beta when they had the whole extreme sliding in, that made the game seem more "Realistic" but it really sucked. If you were in an interceptor or A-wing or any other fast craft you would have to brake 1k meters out before the target or end up sliding 1k past it...







Nice!


Really, that would do more for the suspension of disbelief than the way my ship behaves currently.


That and adding some mass to the NPC ships...they twitch around like paper mache/balsa wood hollow models rather than some laden and lumbering cargo vessel.


(not really complaining, the good things about the game do quite outweigh the bad ones)

JimerLins
Sat Nov 06, 2004 1:51 am
#9

The physics aren't remotely correct. A few things that would be different if the physics were more "real-world":



  • Acceleration. There would be no effective upper limit to how fast you could go; if you wanted to stop going faster you would have to turn off your engines and "coast". Stopping would involve turning around and firing your engines in the opposite direction. If you accelerated for too long, you couldn't ever stop.

  • Turning. See above- if you turn in "real" space, the ship simply turns. You have to apply a new motive force (acceleration) in the new facing direction in order to change direction. But that wouldn't simply change your direction; you'd have to overcome or change the original speed/direction you were going.

  • Pitch/Yaw. You'd change the center of mass relative to your direction every time you changed pitch, roll or yaw, which if the engines were firing at the time could do some pretty wacky stuff.

  • Sound. You'd get no sound from blasters, engines or explosions in space, except your own and that only from feedback through your hull until it got to the cockpit. Sound doesn't carry in a vacuum, so real space combat would be largely silent except for the hum of your engine and the vibrations of your blasters firing. And of course the sound of blasters hitting you. But no environmental noise or that neat howling sound that a TIE makes going by.

When all is said and done, I'm happy with the kinds of mechanics that are in the game. Still, it's fun to play games with "real" physics sometimes. That just woudn't be Star Wars.


If you want to see what "real" physics might look like, I might suggest Babylon 5. The physics there aren't real-world by any stretch, but they're a lot closer than in Star Wars. Of course, there's always 2001: A Space Odyssey, which proved why only the utterly and totally geeky enjoy real physics. The video game Asteroidsand some similar titles used the general model of firing engines to get going, but then coasting until you fire them in another direction, albeit in only two dimensions.





Jimer's Bug Reporting Guide - Gonna file bugs? Read it!


"A man may fight for many things. His country, his friends, his principles, the glistening tear on the cheek of a golden child. But personally, I'd mud-wrestle my own mother for a ton of cash, an amusing clock and a sack of French porn." -Edmund Blackadder
JimerLins
Sat Nov 06, 2004 1:54 am
#10

Oh yeah- forgot to add "fuel" to the physics list. Fuel adds mass, which adds to the acceleration problem and makes it harder to decelerate. Of course, as you burn it, it reduces mass, but you eventually run out and... well, you can fill in the blanks.


There's a certain point where you just can't carry enough fuel to do what you want, because the mass of the fuel offsets the speed you get out of the engine, and adding more just makes the problem worse. In JtL, fuel is never even mentioned, probably for good reasons.



Jimer's Bug Reporting Guide - Gonna file bugs? Read it!


"A man may fight for many things. His country, his friends, his principles, the glistening tear on the cheek of a golden child. But personally, I'd mud-wrestle my own mother for a ton of cash, an amusing clock and a sack of French porn." -Edmund Blackadder
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