How do I make a cel shading effect with basic parts or meshes?

[synical4 (Synical)]

All I want to know is how do I take a basic CylinderMesh and make it inverted. I tried making its scale negative but it did not work.

I know I saw a thing a while back where you could turn parts “inside out” by using cframes but I forgot how. Could someone maybe link that topic or explain how to invert normal roblox parts?

NOTE: I don’t have blender. I don’t really want it either tbh. I don’t model / build often.

[nicemike40]

Inverted Scale doesn’t work with default meshes, only file meshes.

You could do this with CFrame if you really wanted, but I don’t think it’s a good idea.

I give you this quote from Roblox Staff:

@AllYourBlox

If you want to see something interesting, assign your mesh’s parent Part a CFrame with an orthogonal reflection matrix for orientation, like Part.CFrame = CFrame(0,10,0,-1,0,0,0,-1,0,0,0,-1).

This is not an intended feature, however, just a consequence of the ortho-normalization routine accepting already orthonormal matrices, as well as preserving a negative determinant of an orthogonal matrix through normalization. You don’t want to use this in a game though, the code could be updated at any time to keep things right-side out. It’s also not reliable; the part can be subject to re-normalization that flips it back right-side out if it has physics interactions. Rotating it with code or studio tools may also have unexpected results up to and including the part being collapsed out of existence. If you need an inside out part, you should make one with flipped normals and import it as a file mesh. Support for turning built-in meshes inside out is unlikely to ever be a common enough use case to be prioritized, and it’s easy enough to make inside out primitives with Blender.

I wrote about it more here: Preventing glitch in between two CFrame tweens - #4 by nicemike40

Here’s the relevant quote:

@nicemike40

local cf = script.Parent.CFrame
local right, up, back = cf.RightVector, cf.UpVector, -cf.LookVector

local function BreakRightHandRule()
	-- just flip one of them
	script.Parent.CFrame = CFrame.fromMatrix(cf.Position, -right, up, back)
end

BreakRightHandRule()

This does this to our poor part (something similar happened with your d6):

[synical4 (Synical)]

@nicemike40

local cf = script.Parent.CFrame
local right, up, back = cf.RightVector, cf.UpVector, -cf.LookVector

local function BreakRightHandRule()
	-- just flip one of them
	script.Parent.CFrame = CFrame.fromMatrix(cf.Position, -right, up, back)
end

BreakRightHandRule()

This didn’t make the part look any different.
Im using a part with its shape set to cylinder.
I put that script in the part and then copied it after playtesting the game.

[nicemike40]

First this won’t work if you have a CylinderMesh inside the part, I don’t think?

Maybe try CFrame.fromMatrix(cf.Position, right, -up, back) or CFrame.fromMatrix(cf.Position, right, up, -back)?

[synical4 (Synical)]

Im not using a cylinder mesh. Just the basic cylinder part. Lemme test that code.

[synical4 (Synical)]

It works! Tysm!

Now I can add a nice cell-shaded effect to the notes in my rhythm game

Edit: nvm. Once I copy and paste the part it seems to fix itself. Leaving the script in the part does nothing. It inverts it but not on my screen. Only when I go to server view

[nicemike40]

Glad to hear it! Just note that it might break at any time (read the quote by the Roblox Staff that I posted above).

[synical4 (Synical)]

While it seems to be buggy and pretty un-reliable (as stated above) but I did find a cylinder mesh that outlines normal cylinder parts perfectly. Thanks for helping though!