Panning a part on a surface so it points mostly upwords

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#1

Trying to achieve this kind of part panning behavior on surfaces using raycasters
(red squares show how it should be right)

Screenshot_50
Screenshot_50990×516 41.5 KB

In essence, it’s doing alright when raycasted perpendicular to the surface, but otherwise it rotates wrong.
Need some help gathering the offset angle
Code snippet:

local cam = workspace.CurrentCamera
local mouse = player:GetMouse()
local angle =  0
runSv.RenderStepped:Connect(function(dt)	
	local mousePos = mouse.Hit.p
	local camPos = cam.CFrame.p
	local diff = (mousePos-camPos)
	local mag = diff.magnitude
	
	local result = workspace:Raycast(camPos,diff.Unit*500,filter)
	if result == nil then
		if prevPart.Parent ~= script then
			prevPart.Parent = script
		end
	else
		if prevPart.Parent ~= workspace then
			prevPart.Parent = workspace
		end
		local norm = result.Normal
		local lookV = cam.CFrame.lookVector
		
		local fw = norm:Cross(lookV):Cross(norm)
		
		prevPart.CFrame = CFrame.lookAt(result.Position, result.Position+fw, -norm) *
			CFrame.Angles(0,math.rad(angle)+90-vectorsAngle(fw,lookV),0) -- what should I do here in order to make the movement right ?
	end
end)
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#2

I would personally just do:

local directionYouWantItToBe = Vector3.new(0,1,0)

prevPart.CFrame = CFrame.fromMatrix(position,directionYouWantItToBe:Cross(norm),directionYouWantItToBe:Cross(norm):Cross(norm))
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#3

Thank you very much for your help :heart:
Here’s some final adjustment:

local UP = Vector3.new(0,1,0)
if norm ~= UP then
prevPart.CFrame = CFrame.fromMatrix(
	result.Position,
	UP:Cross(norm),
	UP:Cross(norm):Cross(norm)
) * CFrame.Angles(-math.pi/2,0,0) -- so it faces upwords
else
	prevPart.CFrame = CFrame.fromMatrix(result.Position, fw, -norm) *
		CFrame.Angles(math.pi,math.rad(angle),0) -- so it faces upwords		
end

When the part was perpendicular with the UP direction it mostly bugged out the matrix so I had to test it. Now it works :slight_smile:

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