How would i make a good rotational system using only 2 keys?

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#1

So im working on a building system atm, and for rotating parts im currently using 3 keys to turn each XYZ orientation axis, and i realized that this isnt the best way to do it and can be done with just 2 keys, like the roblox studio building keys R and T can rotate a part perfectly by flipping the part either up or to the side.

So ive been trying to do research and figuring out how to do this and i have no clue how to even get this. Would i use orientation and check if the part is rotated in a specific way and then rotate it in a certain direction? or is there something i can use to rotate the part? i dont really know thats why im asking for help.

right now all im doing is

if inp.KeyCode == Enum.KeyCode.R then
		if rotx >= 360 then
			rotx = 90
		else
			rotx += 90
		end
	elseif inp.KeyCode == Enum.KeyCode.T then
		if roty >= 360 then
			roty = 90
		else
			roty += 90
		end
	elseif inp.KeyCode == Enum.KeyCode.Y then
		if rotz >= 360 then
			rotz = 90
		else
			rotz += 90
		end
	end

which is just a simple way to change the orientation of the part, rotx,roty,rotz being the XYZ of the parts orientation axis.

and yes ive tried just using 2 axis like X and Y for orientation and it doesnt work since it doesnt let me turn the part in certain directions.

#2

I’m pretty sure you can just have one key rotate on one axis and the other key rotate on another one. E.g.

if ink.KeyCode == Enum.KeyCode.R then
    thing.CFrame *= CFrame.Angles(math.pi/2, 0, 0)
elseif ink.KeyCode == Enum.KeyCode.T then
    thing.CFrame *= CFrame.Angles(0, math.pi/2, 0)
end
1 Like
#3

i have no idea how this worked but i tried doing something similar where i would just change 2 of the angles like this:

if inp.KeyCode == Enum.KeyCode.R then
	if rotx >= 360 then
			rotx = 90
		else
			rotx += 90
		end
	elseif inp.KeyCode == Enum.KeyCode.T then
		if roty >= 360 then
			roty = 90
		else
			roty += 90
		end
    end
end

and then

cf = CFrame.new(MosX,mosY,MosZ)*CFrame.Angles(math.rad(rotx),math.rad(roty),0)

and it wouldnt work… but anyway thanks lol.