New Physics Class: RigidConstraint

This is not strictly the case. WeldConstraint is meant to replace Weld for manually created joints, however Welds are not deprecated. They’re still fully supported, and it does make sense to use them in the case where you want to script the offset between objects.

Unfortunately WeldConstraint did have a rocky past, and didn’t have the level of polish it should have when initially released. At this point it should be fully stable however, if you have experienced issues with WeldConstraint within the last year we’d be interested to hear more.

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i dont even know what weldcontraint mean and im a scripter i feel so ashamed

TL;DR: WeldConstraint is like a weld but it joins things together at the offset they had right before you created it rather than you having to manually enter a C0 / C1.

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thank you very much for the explanation!

Just to be sure RigidConstraint is like a Weld with C0, C1, equal to the respective Attachments ObjectSpace in relation to their BasePart Parent right?

I feel it would be less efficient with tons of them due to the two attachments, or even in the acute sense against a WeldConstraint for a hat or adornment, just one instance.

WeldConstraint’s low barrier to usage confuses me as to why this was made like is it something else?

I think an better way to conceptualize it is that RigidConstraint is the simplest constraint: It’s a constraint with zero degrees of freedom, exactly snapping the two Attachments together.

It’s not intended that you will be using a “ton of” RigidConstraints. The idea behind RigidConstraints is rather to snap together high-level objects at pre-defined locations, for instance attaching accessories to your character or attaching together large prefab sections of your level. Those aren’t use cases where you’ll be needing that many of them.

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Apologies if this has already been raised but is there any ideas or plans to add this force based snapping feature to WeldConstraints?
The systems in my game revolve around building & this feature would be very useful to have for more dynamic creations however to use Attachments doesn’t play as well with my systems as using WeldConstraints where I can just set the two parts.
I understand this would be expensive to compute so having it as a toggle property might be possible?
Sorry again if this has been raised already, just looking for clarification that this is not planned to ever come to WeldConstraints.
Thank you!

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Waiting for the day when Roblox gets reduced-coordinate multibodies and this actually becomes true…

(assemblies are a form of this for welds)

Destructible brick walls.

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usefull for vr grabbing, still got this error though

RunService:fireRenderStepEarlyFunctions unexpected error while invoking callback: builtin_MoveDragger.rbxm.MoveDragger.Packages.DraggerFramework.Utility.PartMover:374: invalid argument #2 (Vector3 expected, got nil)

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I can confirm things like that do happen, mostly when messing around with various plugins, especially ones that do not handle undo/redo in Studio properly

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Is there an ETA for the force limits for this joint yet?

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7 months later and nothing. There’s just too many updates that get abandoned or left in the dark.

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The amount of great features in recent years that have been announced, half completed and left unfinished is disappointing and seems like a result of rushed crowded quarterly timelines.

Without destruction this joint is only useful as a WeldConstraint that allows an offset, in my opinion that doesn’t constitute a new constraint and should be added to the WeldConstraint. It seemed the initial primary purpose of this joint was initially intended for destruction, I remember it being showcased at a previous RDC.

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It seemed the initial primary purpose of this joint was initially intended for destruction, I remember it being showcased at a previous RDC.

It’s an interesting story – A rigid weld for Attachments was planned long before destruction, and came directly from community feedback. We even considered adding Attachment welding to WeldConstraint rather than a new class, but decided against that for ease of use - WeldConstraint would need a UseAttachments mode that would behave completely differently from how WeldConstraint normally behaves.

The final forcing function that made us add RigidConstraint was that it was impossible to rigidly attach parts to Bones. We also wanted to release joint destruction, but this wasn’t fully decided on.


Is there an ETA for the force limits for this joint yet?

RigidConstraint and breakable constraints are different features with different timelines and, in this case, different teams. We’re always going to choose shipping a complete, well-designed feature over delivering something that’s partially finished.

In this case, the team working on breakable constraints took a longer view and decided that we need a more general form of breaking that’s not specific to just RigidConstraint. I strongly think that’s the right call – breaking is much more useful without being tied to a single joint type.

We’re still working on breaking, but we still can’t promise a timeline yet due to other important projects. We really want it too, trust me.

seems like a result of rushed crowded quarterly timelines

It’s disappointing that this is the reason that you came up with. Posting constructive feature requests is the best way to help us prioritize.

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As you are adding this rigid constraint, And It may feature the joint destruction, Will you compute the weight on top? Like for example a two part connected with a rigid constraint and on the end side hinged to anchored part, Will some weight on the joint area be able to break it?

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Latest client changelog makes it look like they removed it. I was hoping for this too, but yet this appears to be another cancelled/abandoned update.

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When? It’s been nearly a full year…

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I find that it is much easier to place items exactly where you want them to be placed using weld constraints. Maybe I need more practice with using rigid constraints or does anyone else here experiencing the same problem with rigid constraints? Or is there any tips out there on how to position parts using rigid constraints?

Is there still plans to add the breaking physics part of this in the future, or was it canned?

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How do i do this with bones? Struggling with it currently.