How do I make a welded model rotatable?

Help and Feedback Scripting Support
#1

Hey, I have a problem with rotating a welded model.
I’m generating a vehicle from JSON and then I weld each part of each model to VehicleBase which is vehicle’s PrimaryPart, like so:

for _, v in next, vehicle:GetDescendants() do	
	if (v:IsA('BasePart') and v.Name ~= 'VehicleBase') then
		local weld = Instance.new('WeldConstraint')
		weld.Part0 = vehicle.VehicleBase
		weld.Part1 = v
		weld.Parent = vehicle.VehicleBase
	end
end

Then I insert body movers into VehicleBase so the vehicle can move.
Everything works fine but I ran into a problem when I tried to rotate one of the models in this vehicle.
Since the PrimaryPart of each model is constraint-welded to the VehicleBase, rotating one of the model’s PrimaryParts rotates the whole vehicle as well.
It looks like so: https://gyazo.com/a5e213f11f606558043bd907c3c0f611

I’ve looked for the solution but all the answers tell how to dynamically update C0 and C1 of all the welds so they don’t rotate but I can’t really do the same thing having hundrets of parts due to obvious performance issues it would cause.

I’ve also tried using Motor and Motor6D but it seems like the models are all in the same exact place when I use motors. Tried my best to fix it but I’m not really experienced with joints, welds etc. so I failed.

I’m pretty sure it isn’t hard to fix but I have no idea how to go about it. Could anyone help, please?

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#2

anyone able to help? :frowning:
still looking for any clues

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#3

Have you been using C0 or C1 properties to rotate it? This should prevent the whole model being rotated.

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#4

Well, I’m using WeldConstraints to weld all the parts which doesn’t have C0/C1 properties.
Should I use some other kind of weld maybe?

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#5

Ah my bad,
After a quick search on WeldConstraints, it says you can move them via .Position without updating the other parts. Perhaps you could convert your CFrame movement (assuming thats what you were doing originally) to Vectors.

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#6

The problem is that I can’t set the rotation using Position.
I tried with Orientation and it rotated but I would have to calculate the rotation and change the Orientation of each part each frame which would be extremely painful with hundrets of parts…

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#7

Since your using weldconstraint s, do

  1. Save all of these welds temporarily
  2. Rotate your model
  3. Reclone these temp welds back
  4. Finally, remove your temp welds.
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#8

Hmm, it would work but I can’t implement it in my case.
I need to constantly update the rotation of multiple parts, each frame.

I want the guns to be rotatable by 10 - 15 degrees and their orientation is supposed to be calculated using Mouse.Position.

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