Path tracing rendering engine -- WITH A DENOISER

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#1

All of these screenshots use a denoiser with only 10 samples

examplescene
examplescene1370×771 392 KB

Flood escape 2 - Old cave system map
Low lighting test worked well.

infiltrationfe2example
infiltrationfe2example1370×771 438 KB

Infiltration - Map from Flood Escape 2 rendered

outsidelightingexample
outsidelightingexample1370×771 465 KB

Sun got blurred from the denoiser

So far I have not seen anyone make a denoiser for a Roblox path tracing rendering engine. All realtime path tracers have to use some kind of denoiser, because the amount of samples to get a clear image is in the thousands (the gpu can’t do that 60 times a second). My rendering engine can’t use the gpu, but it allows a good image to render with 10 or more samples which the cpu can do in about 30 seconds. It takes about another 30 seconds to denoise and brighten the image.
(Text above is a bit outdated. I have seen some cool stuff recently)

I might make a showcase game for this in the future. Right now I am still experimenting and fixing stuff. Also the resolution is 5th the size of 1920 - 1080, or 384 - 216.

Features:
-Sunlight
-Ambient light
-Glowing objects
-Glowing terrain
-Water - kind of
-Transparent objects - kind of
-Denoiser
-Image brighten thingy
-Transparent objects coloring Sunlight
-Fresnel Reflections
-Smooth transition between full diffuse to specular reflections using the object’s reflection property
-Fake samples – samples color pixels randomly around the sample with edge detection to prevent color bleeding. This compensates for dark scenes without doing more samples and more calculations

And I think that’s it

What I will work on:
-Keeping Sunlight sharp after denoise - Fixed
-Keep objects behind transparent objects sharp before and after denoise - FIXED
-Keeping specular reflections sharp before and after denoise - FIXED
-Have water color sunlight
-Refraction I hope - Completed
-Make it a public showcase game/ make a version for the client

I forgot to mention, I used parts in a viewport frame instead of GUI instances, because I figured out that Roblox I think limits the amount of GUI instances a client can have. That’s a problem for larger resolutions. I think I should use editable images instead but I will have to learn how those work first.

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#2

Potentially, you could use a UIgradient with a Numbersequence Color setting to increase the amount of detail you get with less Frames/GUIs.

#3

During my first attempt I thought about it and tried to make that work, but it was kind of turning into a nightmare to try and do, and how I don’t know how I would hold the data of the image for edge detection without it turning into a mess. I think editable images might work better, but I would love to see if anyone could do that.

#4

I believe it could work the same way as a conventional screen. Essentially, you save colours into a normal table on your however by however many screen size, then chop it up into rows. e.g row 1 = pixel 1 = 256,256,256,pixel 2 = 128,128,128… and so on then you repack them into a coloursequence with the same indexing you used in the square pixel packing, (I cant remember how to index coloursequences right now) but it would be something like colorsequence(1,256,256,256) and coloursequence:(2,128,128,128) and the frame that contains the colorsequence would be the same size as the amount of pixels in one row, so your rendering would be done line by line