Motor6D C1 making entire model move

Help and Feedback Scripting Support
1

Hey guys, thanks for reading.

I’ve been following the EgoMoose FPS tutorial (here’s the link: The First Person Element Of A First Person Shooter - Scripting Helpers) and I’m stuck on the part where he make the View Models arms stick to the gun. I am trying to create my own FPS engine with this as a base.

This is his script:

local function updateArm(key)
    -- get shoulder we are rotating
    local shoulder = viewModel[key.."UpperArm"][key.."Shoulder"];
    -- calculate worldspace arm cframe from Right or Left part in the weapon model
    local cf = weapon[key].CFrame * CFrame.Angles(math.pi/2, 0, 0) * CFrame.new(0, 1.5, 0);
    -- update the C1 value needed to for the arm to be at cf (do this by rearranging the joint equality from before)
    shoulder.C1 = cf:inverse() * shoulder.Part0.CFrame * shoulder.C0;
end

local function onUpdate(dt)
    viewModel.Head.CFrame = camera.CFrame;
    -- update every frame so the arms stay in place when the player aims down sights
    updateArm("Right");
    updateArm("Left");
end

--(Somewhere in his tutorial he links onUpdate to RenderStepped, Mine is just shorter)



--This is my script:
local function armPosition()
    local cf =  gunModelinUse.Right.CFrame * CFrame.Angles(math.pi/2,0,0) * CFrame.new(0,1.5,0)
    shoulder.C1 = cf:Inverse() * shoulder.Part0.CFrame * shoulder.C0

    local cf2 =  gunModelinUse.Left.CFrame * CFrame.Angles(math.pi/2,0,0) * CFrame.new(0,1.5,0)
    lshoulder.C1 = cf:Inverse() * lshoulder.Part0.CFrame * lshoulder.C0
end
	
	game:GetService("RunService").RenderStepped:Connect(function()
		armPosition()
	end)```

I would provide screenshots but there is nothing to screenshot. My arm just flings away when you equip it, and I have no idea why.
Thanks, Have a great day :slight_smile:

2

Do you get any errors?

Also you are not calling the updateArm function.
And you are missing this line:
viewModel.Head.CFrame = camera.CFrame;

3

Hey, thanks for the reply

No errors, that line is handled in my main client script.
Everything works, except for the armPosition() .

4

You only have code for the right arm? What about the left?

5

im trying to get the right done first, and then ill do the left. Ill try adding the left and see if that adds some sort of stability

6

I tried it, now both arms fling away

7

If the rest of the code works, I’d try to first copy and paste from the guide to see if it works then compare your new and old code.

8

I checked out the uncopylocked version, i cant find any real differences between this one and my one. Not sure what else to try.