Shaders in Roblox have arrived! [Penumbra - Luau Graphics]

Crazyblox · December 8, 2025, 12:47am

Penumbra is a Luau graphics library that provides runtime environments with no GPU access (Like Roblox!) the ability to render custom graphics via the use of shader modules!

Grab the latest .rbxm of Penumbra in which you can drag -> drop -> test in studio immediately
Link: https://github.com/Crazyblox/penumbra/releases

All below footage is recorded from within Roblox Studio, running shaders ported from GLSL made to be run in Penumbra.

zoharee4 · December 8, 2025, 5:12am

Can I see examples of implementation in Studio. Thanks

Akira_1Dev · December 8, 2025, 7:00am

It would be greatly appreciated if you could include documentation and examples.

Crazyblox · December 8, 2025, 2:33pm

Agreed; after spending the past few days learning just to get the project out the door, I skimped out on the onboarding. I’m currently working on a better method so that users wont be so intimidated getting things set up.

Crazyblox · December 8, 2025, 4:42pm

Hi folks,

I have just fixed many issues that came with last night’s initial release that made Penumbra & Pajamas impossible to use; apologies if anyone tried diving straight in - I have since validated being able to get the project loaded and set up in studio from the repo myself via the ‘no tools required’ setup process provided in the project’s readme file.

~~Rojo support is being explored and will most likely be added in future versions.~~
Rojo support is added for Pajamas, but Penumbra is still pending.

avodey · December 8, 2025, 9:21pm

This looks amazing but I can’t quite judge it until I’ve seen the interface and performance for these graphics! Have you created any examples with the code provided?

Crazyblox · December 8, 2025, 11:14pm

I’m sorry, I can’t quite understand what you mean by you not being able to see the interface and performance - The project is available for you to set up and run yourself within roblox studio via tool-less step-by-step instructions via the provided repo link at the top of the OP.

JAcoboiskaka1121 · December 9, 2025, 7:25pm

Always the amazing projects get unnoticed, this is phenomenal, good job.

avodey · December 10, 2025, 4:57pm

I wouldn’t set up something this complicated if I didn’t know beforehand how easy or hard it would be to use. Essentially, I was asking if you could show some the code of those example shaders you presented in the videos! But if there isn’t something like that you could show, I might be heavily misunderstanding this resource.

Crazyblox · December 10, 2025, 5:15pm

Here is the code for the shader ‘Mini: Nova’.

github.com/Crazyblox/Penumbra

lib/Pipeline/Shaders/Fragment/Mini_Nova.luau

main

--!strict
--!native
-- Penumbra: Fragment Shader - Mini: Nova [Source: https://www.shadertoy.com/view/WfGSRD]
type f64=number; type vec=vector
local S, Textures = require( "../../../Settings" ), require( "../../../Textures" )
local vec =	vector.create;local vec_1, vec_0_5, vec_0 = vec(1,1,1), vec(.5,.5,.5), vec(0,0);local iResolution:vec =vec(S.Display_Res.x,S.Display_Res.y);local iResolution_div:vec = iResolution+vec(0,0,1);
local radians, degrees, sin, cos, tan, asin, acos, atan, sinh, cosh, tanh, pow, exp, log, exp2, log2, sqrt, inversesqrt, abs, sign, floor, ceil, fract, mod, modf, min, max, clamp, mix, step, smoothstep, length, distance, dot, cross, normalize = -- Requiring implementation: asinh, acosh, atanh, exp2, inversesqrt, trunc, step, smoothstep, distance, faceforward, reflect, refract, determinant, outerProduct, matrixCompMult, inverse, transpose
	math.rad, math.deg, math.sin, math.cos, math.tan, math.asin, math.acos, math.atan, math.sinh, math.cosh, math.tanh, math.pow, math.exp, math.log, math.exp, function( n:f64 ):f64 return math.log( n, 2. ) end, math.sqrt, math.sqrt, math.abs, math.sign, math.floor, math.ceil, function( n:f64 ):f64 return n - math.floor(n) end, function( n:f64, m:f64 ):f64 return n % m end, math.modf, math.min, math.max, math.clamp, math.lerp, function( edge:f64, x:f64 ):f64 return x end, function( a:f64, b:f64, x:f64 ):f64 return x end, vector.magnitude, vector.magnitude, vector.dot, vector.cross, vector.normalize  
local function Sampler_Nearest_Repeat(t:Textures.Texture,UV:vec):vec UV=vec(UV.x%1,UV.y%1)//t.FD;return t[ UV.x + UV.y * t.Width ]end;local function Sampler_Nearest_Clamp(t:Textures.Texture,UV:vec):vec UV=vector.clamp(UV//t.FD,vec_0,vec(t.Width0,t.Height0)); return t[UV.x+UV.y*t.Width];end;local function Sampler_Linear_Repeat(t:Textures.Texture,UV:vec):vec UV*=vec(t.Width,t.Height);UV-=vec(.5,.5);local UV_0:vec =vector.floor(UV);local UV_1:vec =vector.ceil(UV);local A:vec =UV-UV_0;local X0:f64 =UV_0.x%t.Width;local X1:f64 =UV_1.x%t.Width;local Y0:f64 =(UV_0.y%t.Height)*t.Width;local Y1:f64 =(UV_1.y%t.Height)*t.Width;return vector.lerp(vector.lerp(t[X0+Y0],t[X1+Y0],A.x),vector.lerp(t[X0+Y1],t[X1+Y1],A.x),A.y);end;local function Sampler_Linear_Clamp( t:Textures.Texture,UV:vec ):vec UV*=vec(t.Width,t.Height);UV-=vec(.5,.5);local UV_0:vec =vector.floor(UV);local UV_1:vec =vector.ceil(UV);UV_0=vector.clamp(UV_0,vec_0,vec(t.Width0,t.Height0));UV_1=vector.clamp(UV_1,vec_0,vec(t.Width0,t.Height0));local A:vec =UV-UV_0;local X0:f64 =UV_0.x%t.Width;local X1:f64 =UV_1.x%t.Width;local Y0:f64 =(UV_0.y%t.Height)*t.Width;local Y1:f64 =(UV_1.y%t.Height)*t.Width;return vector.lerp(vector.lerp(t[X0+Y0],t[X1+Y0],A.x),vector.lerp(t[X0+Y1],t[X1+Y1],A.x),A.y)end
--[[ SHADER ]]--
--local iChannel0: Textures.Texture =	Textures.Load.Base( {}, "" )
local texture = Sampler_Linear_Repeat
local function Shader( fragColor:vec, fragCoord:vec, iTime:f64 ):vec
	--//Horizontally centered and scaled coordinates
	local p:vec = (fragCoord*2.-(iResolution.x*vec(1,1)))/iResolution.y
	--//Distance to circle edge (radius of 1)
	local l:f64 = 1.-length(p)
	local fragMult:f64 = .1/max(l/.1,-l)
	return vec(
		tanh( ( 1.2 + sin( p.x + iTime ) ) * fragMult ),

This file has been truncated. show original

This shader was originally created by Shadertoy user Xor - Here is the source for their GLSL code..
https://www.shadertoy.com/view/WfGSRD

Every shader module in Penumbra has its Shadertoy GLSL source linked if it originated from there - I think the only Penumbra shaders that weren’t sourced from Shadertoy were Mandelbrot and Distortion.

zoharee4 · December 11, 2025, 5:46am

i mean please provide us media of what it can do in ROBLOX

Crazyblox · December 11, 2025, 12:10pm

Provided media of what it can do in Roblox is in the OP.

thatconvictedfelon · December 12, 2025, 5:38am

This is absolutely astonishing work!

Crazyblox · December 12, 2025, 3:51pm

Hi folks,

I have provided a quick setup video guide in the OP in order to make running the project from the github repo’s as easy as possible.

Hope this helps

TTC3B · December 15, 2025, 12:20pm

Tool to convert GLSL into LuaU

Unless I don’t understand a thing that’s going on

Crazyblox · January 24, 2026, 10:01pm

Footage of another shader I ported today after doing some work on optimising the system a bit more

SpoostyGuy · January 25, 2026, 1:21am

looks like the eye of a tornado

kind of crazy how this is all running on cpu

Crazyblox · January 30, 2026, 7:39am

Fractal Raymarcher

dolono3 · February 1, 2026, 1:17am

wowwwwwww this is crazy nice job mr crazy blox of fe2

Eternity_Devs · February 1, 2026, 12:41pm

Cave Beach