RotVelocity, Velocity, Position, Orientation inaccuracies

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#1

FirePoint is the part selected in the gif, at the tip of the gun. Visually, it is unmoving. However, whenever i try to fire, the bullet comes form a seemingly random direction. After researching the problem for a bit, I found this:

The gun in question is a rigged model that is attached to the camera (through RenderStepped). None of my other guns do this. Another demonstration of the seemingly broken and wrong position readouts:

I am beyond confused. I’m not sure what code is causing this, but heres the script that keeps the gun on the camera, incase it might be some help.

game:GetService("RunService").RenderStepped:Connect(function()
	if game.Workspace.WeaponPreview:GetChildren()[1] then
		local gun = game.Workspace.WeaponPreview:GetChildren()[1]
		if char[gun.Name] then
			if char[gun.Name]:FindFirstChild("Aiming") then
				if not char[gun.Name].Aiming.Value then
					pos = game.Workspace.CurrentCamera.CFrame*CFrame.new(char[gun.Name].Offset.Value) * CFrame.Angles(math.rad(char[gun.Name].PosRotation.Value.X),math.rad(char[gun.Name].PosRotation.Value.Y),math.rad(char[gun.Name].PosRotation.Value.Z))
					gun:SetPrimaryPartCFrame(pos)
				else
					pos = game.Workspace.CurrentCamera.CFrame*CFrame.new(char[gun.Name].AimOffset.Value) * CFrame.Angles(math.rad(char[gun.Name].PosRotation.Value.X),math.rad(char[gun.Name].PosRotation.Value.Y),math.rad(char[gun.Name].PosRotation.Value.Z))
					gun:SetPrimaryPartCFrame(pos)
				end
			else
				--its a tool
				pos = game.Workspace.CurrentCamera.CFrame*CFrame.new(char[gun.Name].Offset.Value) * CFrame.Angles(math.rad(char[gun.Name].PosRotation.Value.X),math.rad(char[gun.Name].PosRotation.Value.Y),math.rad(char[gun.Name].PosRotation.Value.Z))
				gun:SetPrimaryPartCFrame(pos)
			end
		else
			gun:Destroy()
		end
	end
end)
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#2

Try anchoring the FirePoint or setting its Velocity to (0, 0, 0) every RenderStepped.

I think it happens because even though you set the position every frame, the Velocity just keeps growing and growing until the FirePoint can reach a height of -50000 in a single frame and gets destroyed.

#3

I’m quite confused about this code. How are you setting the position of the fireplace? Are you using WeldConstraints?

#4

The firepoint is welded to the gun, in a model. The model is moved onto the camera every render step using :SetPrimaryPartCFrame.

#5

Thank you very much, while I may not know whats causing the velocity to freak out, we do know what fixes it! Thanks! :smile:

I can’t have them anchored since that would break the animations, but setting the velocity to 0 fixed it just fine.

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#6

Keep in mind RootPriority should be higher in whichever part of the weld connection you want to be the main handle. So in this case, the firepoint should have a lower RootPriority.

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