CFrame Angle problems with radians

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#1

I’ve created a script to interpolate a part’s angles revolving fully around a circle in a loop (counter clockwise), however I don’t know how/why the CFrame angles are moving the position as well. It’s probably to do with how I’m handling the calculation of standard position, as I haven’t found a way to retrieve that successfully as tuple of 3 values.

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local part = script.Parent
local TweenService = game:GetService("TweenService")


local function rotationFromCFrame(cframe)
	--[[ Returns a tuple containing the angles from any cframe passed. ]]
	
	-- why not `local standardPos = CFrame:ToEulerAnglesXYZ (CFrame.Angles(part.CFrame))`?  Argument 3 missing or nil for some reason appears even if (0,0,0)
	local components = { cframe:components() } -- put into array
	return components[4], components[5], components[6]
end


------- Variables
local standardPos = CFrame.Angles( rotationFromCFrame(part.CFrame) )
print(standardPos)


local rotations = {
	math.pi/2,
	math.pi,
	(3 * math.pi)/4,
}


local function tweenRot(part, cframe, duration)
	--[[ Tween wrapper that rotates a part's rotation from passed args. ]]
	
	local goal -- declare. should never be nil
	if cframe == 'standardPosition' then
		goal = {
			CFrame = standardPos
		}
	else
		goal = {
			CFrame = part.CFrame * cframe
		}
	end

	
	local tweenInfo = TweenInfo.new(
		duration,
		Enum.EasingStyle.Sine,
		Enum.EasingDirection.Out,
		0,
		false,
		0
	)
	

	local tween = TweenService:Create(part, tweenInfo, goal)
	tween:Play()

	
	local debugvars = "goal: "
	for i,v in pairs(goal) do
		debugvars = debugvars .. tostring(v) .. ', '
	end
	print(debugvars)
end




------- Main
repeat wait()
	for index=1, #rotations  do
		wait(3)
		tweenRot(part, CFrame.Angles(0,rotations[index],0), 1)

		print('Index CFrame:\t i=' .. index .. ' | ' .. tostring( rotations[index]) )
		print('Part CFrame:\t i=' .. index .. ' | ' .. tostring( rotationFromCFrame(part.CFrame) ) .. '\n')
	end
	wait(3)
	
	tweenRot(part, 'standardPosition', 1) -- reset to standard pos
until part == nil
1 Like
#2

You are setting the CFrame of the part as a CFrame returned by CFrame.Angles(), which means the Position of that CFrame is Vector3.new(0, 0, 0). If you only want to set the rotation as the rotation of standardPos and not change the position, try replacing

CFrame = standardPos

with

CFrame = CFrame.new(part.Position)*standardPos
1 Like
#3

Thank you. That fixes one problem, however the part still doesn’t rotate correctly purely around the y axis, and nor in one direction

#4

I think you may have misunderstood how CFrame:ToEulerAnglesXYZ works, because you had this in a comment

local standardPos = CFrame:ToEulerAnglesXYZ (CFrame.Angles(part.CFrame))

To get the angles from the CFrame of the part, you can simply do this.

local x, y, z = part.CFrame:ToEulerAnglesXYZ()

ToEulerAnglesXYZ is a method, not a constructor.

#5

Is the 3rd element in your rotations array supposed to be (3 * math.pi)/2 ?