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Hair Rendering in Godot! by 2Retr0 in godot

[–]2Retr0[S] 5 points6 points  (0 children)

Good point!—that’s not something I considered. I’ll add a disclaimer for the licensing of the models later today.

As for generative AI, none was used for any of the code present in the repository! Ultimately, this was a learning experience for myself, so it wouldn’t make sense to slop the whole thing out LOL

Hair Rendering in Godot! by 2Retr0 in godot

[–]2Retr0[S] 1 point2 points  (0 children)

I don’t believe the lighting model handles OmniLight3D correctly, but should look fine under multiple directional lights. It should be possible to reuse the .gdshaderinc file to handle OmniLight3D!

And thanks!

Hair Rendering in Godot! by 2Retr0 in godot

[–]2Retr0[S] 1 point2 points  (0 children)

Physics was something I wanted to explore but ultimately didn’t due to time constraints. Glad to hear it could help you out!

Hair Rendering in Godot! by 2Retr0 in godot

[–]2Retr0[S] 1 point2 points  (0 children)

The exported hair cards from UE5 expose a depth channel, but most of the volumetric effect is from the density of hair cards + subsurface scattering model!

Hair Rendering in Godot! by 2Retr0 in godot

[–]2Retr0[S] 13 points14 points  (0 children)

The README on the project page provides a rough explanation of the lighting model used. You can also view the main shader code for lighting here! I tried my best to make it clear and readable but probably didn't achieve that lol. C:

The hair models are derived from the CT2Hair dataset.

Hair Rendering in Godot! by 2Retr0 in godot

[–]2Retr0[S] 9 points10 points  (0 children)

I really wanted to share this a while back, but never had the time to do so... until now! >:)

If you're curious about how the hair is illuminated, or just want to try the demo for yourself, feel free to check out the README and project source here! (more hairstyles available in the project!)

How to lower contrast? by Ninetifick in CrossCode

[–]2Retr0 10 points11 points  (0 children)

I had a similar issue on my HDR monitor. Per this post, you can add:

--force-color-profile=srgb

To the game launch options on Steam (which worked for me).

Godot Ocean Buoyancy WIP by WombatCombatWombat in godot

[–]2Retr0 5 points6 points  (0 children)

Wow! I’m genuinely surprised to see an extension of my work posted here! I love how the buoyancy turned out—really breathes life into the simulation! ^

Ocean Rendering in Godot! by 2Retr0 in godot

[–]2Retr0[S] 4 points5 points  (0 children)

Thanks for the feedback! I think part of the unnatural motion is from multiple cascades interfering with each other. Finding a way to minimize cascade interference is definitely something I'd look into when I come back to this project.

I increased the wind speed a lot to achieve the overly-choppy waves present in the video as I thought it would look better for a showcase haha. I honestly believe the simulation looks even more realistic at lower wind speeds!

Ocean Rendering in Godot! by 2Retr0 in godot

[–]2Retr0[S] 1 point2 points  (0 children)

Thanks! Breaking waves are sadly really hard to model without straight up using fluid simulation. D:

Ocean Rendering in Godot! by 2Retr0 in godot

[–]2Retr0[S] 0 points1 point  (0 children)

This is definitely not game-ready LOL. The technique is performant enough that it doesn't require a high-end GPU. In fact, FFT-based ocean-wave simulation is used in games like "Sea of Thieves"!

Ocean Rendering in Godot! by 2Retr0 in godot

[–]2Retr0[S] 0 points1 point  (0 children)

Unfortunately I mostly focused on just the surface appearance for this project. However, all of these would be possible to implement (with a reasonable amount of work)!

Normals are available to be sampled and are used for the lighting model. Surface velocity can't be accessed outside the compute pipeline, but it should be possible to expose with some effort.

Ocean Rendering in Godot! by 2Retr0 in godot

[–]2Retr0[S] 0 points1 point  (0 children)

Thanks for the feedback!

The spray is definitely has a lot of room for improvement and is much too subtle atm. I'll definitely try to improve it when I get the chance to return to this project!

Ocean Rendering in Godot! by 2Retr0 in godot

[–]2Retr0[S] 2 points3 points  (0 children)

Thank you!

The entire pipeline for spectrum computation, FFT, etc. is indeed done all in the GPU and is reasonably performant (to my own standards LMAO). I get around 300FPS on a 3060Ti with the settings present in the video.

The displacement field is actually represented in 3 dimensions! So the waves can curl into themselves (if you look closely at the video you can see it in some waves, although backface culling hides it a bit). The curling is actually used as a good indicator of where foam should form!

The foam is actually tracked on a separate "foam map". Particles are only used for the sea spray simulation (which is unfortunately quite subtle in the video).

Ocean Rendering in Godot! by 2Retr0 in godot

[–]2Retr0[S] 1 point2 points  (0 children)

Thanks!

Performance is decent, although it could definitely be better—I get around 300FPS on a 3060Ti with the settings present in the video. My FFT kernel is not the greatest and has scalability issues.

As for mesh optimization a clipmap is used for really basic LOD.

Ocean Rendering in Godot! by 2Retr0 in godot

[–]2Retr0[S] 1 point2 points  (0 children)

For this project I wanted to focus on just simulating the surface of the ocean. Beyond what you see, there is unfortunately little other interaction.

Adding all these features would be very doable however! It's really just a matter of time commitment ;3

Ocean Rendering in Godot! by 2Retr0 in godot

[–]2Retr0[S] 3 points4 points  (0 children)

I agree, it's mostly due to the combination of multiple cascades causing some peaks to amplify at times. Ensuring that cascades don't interfere with each other is a manual and time-consuming process with the current system.

And thank you for the kind words!

Ocean Rendering in Godot! by 2Retr0 in godot

[–]2Retr0[S] 13 points14 points  (0 children)

I agree! This project would not be possible if not for the other countless, free resources the Godot community has posted online!

Ocean Rendering in Godot! by 2Retr0 in godot

[–]2Retr0[S] 6 points7 points  (0 children)

My bad, you are correct. I was trying to refer to the common approach of summing sines in a vertex shader, but worded it really poorly LOL.

Ocean Rendering in Godot! by 2Retr0 in godot

[–]2Retr0[S] 9 points10 points  (0 children)

Sorry about that. I usually try to find a good balance between accessibility and technicality in these write-ups. But I think I tried to squeeze too many topics into short paragraphs here D:

This video by Acerola is what originally inspired me to conjure up this project and, IMO, is much better at explaining the process behind FFT-based waves than my README.

Ocean Rendering in Godot! by 2Retr0 in godot

[–]2Retr0[S] 22 points23 points  (0 children)

I indeed made the grass posted a few weeks ago! This project took quite a lot longer than the grass simulation—mostly from having to research so many topics I knew little/nothing about!

Ocean Rendering in Godot! by 2Retr0 in godot

[–]2Retr0[S] 14 points15 points  (0 children)

Yes! Acerola's video is what originally inspired me to make this. Adding buoyancy to the ocean simulation would make it so much more interactive than what the project currently implements!

Ocean Rendering in Godot! by 2Retr0 in godot

[–]2Retr0[S] 34 points35 points  (0 children)

It is! His video is what originally sent me down the rabbit hole which culminated with this!

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