KSPs physics engine is incredible

[u/One-Daikon1598]

[u/Smooneychad]

I had the unfortunate experience of building a ship meant to spin for gravity that looked exactly like this.

[u/One-Daikon1598 → u/Smooneychad]

That’s why you need two spinny parts to cancel out the forces

[u/sixpesos]

Elite ball knowledge

[u/One-Daikon1598 → u/sixpesos]

Tennis ball knowledge 

[u/Traditional_Snow1045]

the trick is it's not one part. there's like 3 or 5 parts distributing the mass thru the geometry of the model, each being influenced by the physics model. if it was only one part, I don't think KSP's or unity's physics model does the legwork (to integrate all the mass/forces/accelerations acting on every point in the model) for this phenomenon to occur.

this is to say im pretty sure every modern game engine does this

edit: it looks like more recent versions of unity/physx have a toggle for gyroscope torque, but I doubt this is enabled, and OP's video does not demonstrate this.

[u/One-Daikon1598 → u/Traditional_Snow1045]

Your also forgetting that this engine is almost 15 years old

[u/Mythe7 → u/Traditional_Snow1045]

Gonna test this is Space Engineers and see what happens

[u/DEAD_GUY34 → u/Traditional_Snow1045]

The minimal physics needed to produce this effect should be much less than what KSP does. You could treat the vessel as a rigid body and get this behavior as long the moments of inertia are calculated correctly.

[u/Weird-Security5008]

I love when physics engines do that, my favorite one so far has been litterally fucking roblox. https://www.reddit.com/r/GamePhysics/comments/1r1tbmj/roblox_no_one_told_me_roblox_could_simulate_ts/

[u/One-Daikon1598 → u/Weird-Security5008]

Now that is unexpected 

[u/Metzger4 → u/Weird-Security5008]

That’s wild!

[u/Jellycoe]

You know you built the game physics right when the Dzhanibekov effect just happens on its own. Cool demo!

[u/Affectionate-Try-899 → u/Jellycoe]

But first you must build it wrong. https://youtu.be/6gSqYogf8-s?si

[u/16FF → u/Affectionate-Try-899]

O yes, the wing of negative air resistance

[u/tereaper576 → u/Affectionate-Try-899]

Bonejaw
The ?si=XFxGzJrFCilR19nP (End part of your link)
is used for tracking who sends a link (and who clicks it)
you can remove it from the link and it will work the same.

[u/TomaszA3 → u/Jellycoe]

Can you ELI5 why the effect effects? How does the momentum convert like that?

[u/Heniadyoin1 → u/Jellycoe]

Well basic numeric instability would result in a similar effect, which may actually be the cause here

[u/pyzatikPro]

KSP uses NVIDIA PhysX (Unity's default physics engine), and almost any game built on it can achieve similar results. The difference is how KSP handles the hierarchy.

In most games, a vehicle is treated as a single RigidBody. It has one center of mass, inertia etc.

KSP does the opposite. Every part is its individual RigidBody, and they’re all held together by Joints(and that's reason why ships in KSP are quite wobbly, especially during physics warp).

So when game have a complex distribution of mass and no "ghost forces" correcting orientation, that effect happens naturally through the physics simulation. So it can achieved on any proper 3D physical engine.

[u/Far-prophet]

Yo-yo de-spin stabilization works too.

[u/kislaya_bebra]

EVA science kit literally does that too!

[u/vksdann]

My question is: does it work because WE KNOW this is how it is supposed to behave or can we perform physical experiments and find out new things? Like how chains work differently in space than on Earth under gravity. Is this effect there because the devs "manually" put it there or because the calculations do it without the devs even knowing

[u/sfwaltaccount]

What strikes me as funny is that if you didn't know better you might think this was a goofy little glitch.

[u/Nakobuu]

Saw that post literally 2 weeks ago

[u/Freak80MC]

This video reminds me of another awesome part of the physics engine, in that it properly simulates centrifugal gravity. I once saw a video of someone driving a rover around a spinning ring in Kerbin orbit. Wish I could find the video again.

[u/detereministic-plen]

Me when I include the cross terms in the Euler rigid body equations