How do I replicate Real Arm movements to Fake Arms (ViewModel)?

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I whipped up a repro in a couple of minutes in the concept of the view model you’re currently attempting to achieve. I had to make a few respective adjustments from what I suggested to accomodate for R6 rigs. Namely, the following was done:

  • Changed HumanoidRootPart to Torso, as all character limbs are held in the Torso for R6 rigs

  • I used the transform method rather than my originally suggested AnimationPlayed method

In addition to all this, I went ahead and created a rough rig that has correct orientations for the limbs and Motor6Ds. The success of the repro leads me to believe that what you have right now is an incorrect orientation of the Motor6Ds. Observe what my repro does:

One of the only necks is that the Torso doesn’t move as well but that can easily be fixed with a couple of changes here and there. I only accounted for arm movement. You may need to add an extra limb for the torso for accurate movement and use the HumanoidRootPart as a real root.

Here’s what it looks like in first person when touched up:

Code: 
local LocalPlayer = game:GetService("Players").LocalPlayer
local Character = LocalPlayer.Character or LocalPlayer.CharacterAdded:Wait()
local RenderStepped = game:GetService("RunService").RenderStepped
local ViewModel = game:GetService("ReplicatedStorage").ViewModel:Clone()
local ViewModelRoot = ViewModel.PrimaryPart

ViewModel.Parent = workspace

RenderStepped:Connect(function ()
	ViewModelRoot.CFrame = workspace.CurrentCamera.CFrame * CFrame.new(0, -1.5, 0)
	-- Hardcoded logic test
	ViewModel.Torso["Left Shoulder"].Transform = Character.Torso["Left Shoulder"].Transform
	ViewModel.Torso["Right Shoulder"].Transform = Character.Torso["Right Shoulder"].Transform
end)

Repro file: ViewModelRepro.rbxl (19.4 KB)

Just a warning that collisions may interfere due to the way Humanoids hack them together. I’ve applied CollisionGroups but I’m not sure if that resolves the problem. You’ll need to experiment a bit to find something that fits.

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