How to freeze position and rotation in Unity Physics? | Official Unity Discord | Page 1

real kite Apr 9, 2025, 3:24 AM

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i want to constraint all rotation and z-axis. but it doesnt work.

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how it makes work?

lone siren Apr 9, 2025, 3:25 AM

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i don't know why they've never hooked the baker up to this to work

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i think you need to set the InertiaTensor

real kite Apr 9, 2025, 3:27 AM

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this one?

lone siren Apr 9, 2025, 3:31 AM

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i believe you can only set it via the custom authoring or at runtime

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oh wait i just saw you highlighted that

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i didn't realize that was there

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yeah that might work

real kite Apr 9, 2025, 3:32 AM

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https://stackoverflow.com/questions/70000365/how-can-i-freeze-constraint-a-physicsbodys-rotation-in-unity-dots

Stack Overflow

How can I freeze / constraint a PhysicsBody's rotation in Unity DOTS?

I was trying to port a small test project from Unity Engine to learn about Unity New Fishers DOTS && ECS.
It's a small project where I have a capsule with a Rigidbody and I move it from lef...

lone siren Apr 9, 2025, 3:32 AM

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i don't know, i haven't used rigidbody authoring in a long time

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i only use the custom authoring scripts

real kite Apr 9, 2025, 3:32 AM

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oh..

real kite Apr 9, 2025, 3:32 AM

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real kite this one?

this option just through out my platform

lone siren Apr 9, 2025, 3:32 AM

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setting these to infinity will lock rotation around the axis

real kite Apr 9, 2025, 3:33 AM

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my player entity just through platform

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and fall down

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why this happen

lone siren Apr 9, 2025, 3:35 AM

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as i said, idon't know if this was ever hooked up to the normal rigidbody - it wasn't for a long time but it probably is now

real kite Apr 9, 2025, 3:35 AM

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holy moly

lone siren Apr 9, 2025, 3:35 AM

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however for the record though, i'm not sure there's a way to freeze movement without a custom script in the simulation (probably not that hard)

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it might only be possible to freeze rotation

real kite Apr 9, 2025, 3:36 AM

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am i just create some force freeze system?

lone siren Apr 9, 2025, 3:38 AM

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i've never looked too much into it because i haven't had a need, but there are all these injection point systems within unity physics simulation that let you manipulate the simulation

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so i'm sure you could stop z movement if you want in there

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i can't help you with the correct timing though

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unity physics really wasn't designed for 2d sadly which seems to be what you want here

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but there are people who make 2d games so maybe they have a better idea

real kite Apr 9, 2025, 3:39 AM

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got it

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thank you!

brazen badger Apr 9, 2025, 7:58 AM

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real kite am i just create some force freeze system?

https://github.com/Unity-Technologies/EntityComponentSystemSamples/blob/master/PhysicsSamples/Assets/8. Joints and Motors/Joints - Limit DOF.unity
this is a current way to constrain some axis
if you have small amount of entities it will be fine, I hope you aren't going to constrain millions of tiles of 2d grid-map

GitHub

EntityComponentSystemSamples/PhysicsSamples/Assets/8. Joints and Mo...

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real kite Apr 9, 2025, 8:14 AM

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what am i looking this file

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i need any keyword

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this one?

lone siren Apr 9, 2025, 8:17 AM

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maybe just look at the sample

brazen badger Apr 9, 2025, 11:12 AM

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real kite what am i looking this file

this is a scene with example, pull this repo and open in unity

real kite Apr 9, 2025, 11:18 AM

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ok thank you

real kite Apr 9, 2025, 1:56 PM

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@brazen badger this one?

brazen badger Apr 9, 2025, 1:58 PM

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real kite <@211412189532127232> this one?

yes, this is an example of setup with constrained axis

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basically it's a joint but joint to nothing
you can even unparent it (because parenting is shitty thing to have) or create during runtime if you know what to do

#How to freeze position and rotation in Unity Physics?