Mykhailo Moroz @Michael_Moroz_ Twitter profile

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Mykhailo Moroz

@Michael_Moroz_

3 years

Finally implemented fluid ray tracing😤. Works in 60fps in real time on my mobile GPU. Now full internal reflection and fluid depth is properly accounted for. More cool rendering features to come 🙌 #realtimeVFX #ZibraLiquids #unity3d #Simulation #gamedevelopment

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Mykhailo Moroz

@Michael_Moroz_

2 years

I improved the VRChat cloth simulation, now it is actually rendered as a mesh and finally can handle self collision for proper folds. Also I moved the simulation to CRTs so it kinda works for non friends(the simulation is on the avatar!). But the collision still requires cameras.

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Mykhailo Moroz

@Michael_Moroz_

2 years

Made a GPU particle based curtain simulation in VRChat, next I'm going to actually use a proper mesh for rendering, should be really cool.

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Mykhailo Moroz

@Michael_Moroz_

2 years

Continuing working on foam, added partial foam occlusion from liquid absorption and a bit better foam physics

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Mykhailo Moroz

@Michael_Moroz_

7 months

Decided to implement this as a compute shader. Looks very nice with millions of points! I've also made the beta parameter parametrize the color by a spectrum function.

Differential Eqns

@diff_eq

7 months

3D bifurcation diagram

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Mykhailo Moroz

@Michael_Moroz_

3 years

The fluid simulation plugin for Unity I've been working on for these months has finally released on the Unity Asset Store! Check it out: Also you can check out the free version: If you have any questions:

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Mykhailo Moroz

@Michael_Moroz_

2 years

I've been playing VRChat recently so decided to make a water simulation shader. This is basically a carbon copy of the WebGL water demo, but in VR

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Mykhailo Moroz

@Michael_Moroz_

2 years

Finally figured out how to hack GPU vertex/index buffers in unity meshes, now I can use native unity materials and rendering for the liquid mesh 😤. Meaning all the rendering stuff you can have in unity you can have here too. It is a bit slower tho due to some Unity limitations😔

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Mykhailo Moroz

@Michael_Moroz_

2 years

Implemented liquid force fields based on SDFs. Now liquids can take any form 🧐. Next on the list is to finally add skinned mesh support for this to work with character models. #ZibraLiquids

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Mykhailo Moroz

@Michael_Moroz_

1 year

So I kinda got mesh fitting working, taking a simulation mesh and fitting it on top of a given mesh. For a test I used a simple skirt, but there would still be lots of work to make it work on my avatar as an actual skirt. Different mesh topologies are gonna be just as hard to add

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Mykhailo Moroz

@Michael_Moroz_

4 years

Emergence is truly a fascinating thing, one moment you mess with random fluid systems, and the other moment cellular life emerges. Yeah, those things even have a cell structure, idk how that happened, but its amazing.

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Mykhailo Moroz

@Michael_Moroz_

3 years

Made a volumetric bidirectional path tracer in shadertoy. Basically tracing a laser path, and then trying to connect the camera path with the laser path using importance sampling.

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Mykhailo Moroz

@Michael_Moroz_

2 years

Took me a month, but the blog post is finally finished! 🫡 Here I'll explain how to write up a generalized space time geodesic ray tracer in GLSL, as well as going in-depth into Lagrangian/Hamiltonian mechanics with derivations of the geodesic equations!👀

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Mykhailo Moroz

@Michael_Moroz_

1 year

After some messing around I've switched to a different simulation method, with precomputing the neighboring vertices into a texture. I've made a tool that converts unity cloth's into shader based cloths. Here as a demo I'm trying a 30k vertex mesh. Still lots of work ahead tho

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Mykhailo Moroz

@Michael_Moroz_

2 years

More tests of the liquid mesh rendering. A bit slow it seems yeah. Needs a lot of optimization

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Mykhailo Moroz

@Michael_Moroz_

1 year

Now that the latest Chrome version has WebGPU support I guess I can finally talk about this. A year ago @david_ar and @cornusammonis were developing a compute shader based Shadertoy alternative called I already had a lot of fun making some toy projects 😳

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Mykhailo Moroz

@Michael_Moroz_

3 years

Huh, just by shifting the points randomly on a circle depending on the distance to the focal place I can get free bokeh. There is just so many particles I guess

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Mykhailo Moroz

@Michael_Moroz_

2 years

The cat is out of the bag finally👀 Since summer I've been working on a smoke/fire real time GPU simulation plugin as well. It features a multigrid pressure solver and a fully custom volumetric rendering system for Unity.

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Mykhailo Moroz

@Michael_Moroz_

2 years

Added friction to the self-collision terms, omg it works so good even tho I only track a single closest non-neighboring particle(and stochastically at that)

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Mykhailo Moroz

@Michael_Moroz_

2 years

As a side project I've been working on a Kerr black hole shader for Space Engine with a volumetric accretion disk. The way a Kerr black hole distorts space is really odd because of frame dragging🤔. I might make a blog post about how I solve for geodesics in general.

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Mykhailo Moroz

@Michael_Moroz_

2 years

A vacuum bubble around a quickly moving object(or liquid). #VFX #realtimeVFX #ZibraLiquids #unity3d #Simulation

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Mykhailo Moroz

@Michael_Moroz_

3 years

Implemented SDF inversion, now you can make fluid inside arbitrary boundaries. Also improved fluid stability, figured out how to remove particle giggling when only a few particles a present, it seems the divergence part of the affine matrix produced unstable oscillations.

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Mykhailo Moroz

@Michael_Moroz_

8 months

Ported the particle clustering SPH simulation to VRChat. I can look at that simulation forever😳 Next I need to add avatar collision with the fluid

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Mykhailo Moroz

@Michael_Moroz_

3 years

Implemented radial force fields, now I can make tiny water planets 🙃

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Mykhailo Moroz

@Michael_Moroz_

2 years

Now that I have a way to render multi material liquids, I thought that it would be pretty trivial to add something that looks like foam by adding a material based on velocity gradient, so here is the result of the experiment. Of course its a bit blurry but I think it might work

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Mykhailo Moroz

@Michael_Moroz_

3 years

Testing fluid interation with lots of objects. Real time 3D liquid simulations can finally be used as a gameplay feature. Can't wait to see how this can be used in games👀 #unity3d #ZibraLiquids #vfx #realtimeVFX

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Mykhailo Moroz

@Michael_Moroz_

3 years

Working on new types of force fields, directional and swirl(also improving the radial one). Those can be used to make all kind of cool splash effects🙃 #realtimeVFX #ZibraLiquids #unity3d #Simulation #gamedevelopment

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Mykhailo Moroz

@Michael_Moroz_

3 years

I didn't think atomic add's were this fast. I was messing around with a particle cloud rasterizer, before this I was rasterizing them using a radix sort, I thought that was fast, but now that I tried atomics I can render 16M particles at 100fps(wat) which is 6x faster than radix

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Mykhailo Moroz

@Michael_Moroz_

3 years

Over the last 6 months I've been working on a real time fluid simulation plugin for Unity. At its core it uses a GPU implementation of MLS-MPM. You can try it yourself: . Right now it's in early access. #ZibraLiquids #Unity3d #RealtimeVFX #FluidSimulation

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Mykhailo Moroz

@Michael_Moroz_

2 years

Improving Zibra Liquids foam generation, still lots of work ahead. Specifically the foam is not yet occluded by the liquid, making it look way too white

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Mykhailo Moroz

@Michael_Moroz_

8 months

Implemented anisotropic kernels in my VRChat fluid sim () Now to figure out how to get high quality normals out of this... (no screen space, thanks) Also still need to make tighter billboard quads for the ellipsoids, rn pretty expensive to render

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Mykhailo Moroz

@Michael_Moroz_

2 years

One of the coolest applications of the new Zibra Smoke&Fire plugin I'd say would be this tire smoke sim. It showcases volumetric rendering illuminated by multiple point lights. The simulation domain moves with the car which creates the illusion of a boundless simulation

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Mykhailo Moroz

@Michael_Moroz_

2 years

After somewhat improving the way volumetric materials are rendered, I've checked how foam looks in HDRP. Results are pretty good, but there is not enough high frequency detail, adding additional foam/splash particles will definitely improve the looks further🧐

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Mykhailo Moroz

@Michael_Moroz_

3 years

Shooting a white laser through glass fractals

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Mykhailo Moroz

@Michael_Moroz_

3 years

Made a Shadertoy port of Marble Marcher! (original game by @_CodeParade_ ) Everything is inside a fragment shader, even the physics/gameplay! Also I've implemented some cool features like TAA and a path tracing mode(look up define in Common tab)

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Mykhailo Moroz

@Michael_Moroz_

2 years

Finally a blog post about the volumetric accretion disks I've been helping to make for Space Engine! Soon I'll also release a blog post about the math behind the geodesic ray tracer.

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Mykhailo Moroz

@Michael_Moroz_

4 years

So I had some time messing around with the cell system I've discovered, here are some interesting variations I found

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Mykhailo Moroz

@Michael_Moroz_

2 years

After fine tuning dual contouring the mesh seems to look relatively good on splashes. Also the depth of the liquid is ray marched per vertex, making it much faster to render than ray marching per pixel. I think I can still improve the mesh though.

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Mykhailo Moroz

@Michael_Moroz_

2 years

Working on improving liquid mesh and render. Surprisingly by generating the initial dual contour mesh from an isovalue close to 0 and gradient descending it to a high isovalue counterintuitively makes the mesh much more fluid like and with a higher quad density.😳

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Mykhailo Moroz

@Michael_Moroz_

2 years

Researching particle based destructible soft bodies(not PDB yet) The approaches differ quite a lot from MPM-MLS, but the core idea is still the same - to track the deformation. In this case I track the deformation explicitly, by storing the original particle positions.

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Mykhailo Moroz

@Michael_Moroz_

2 years

Fixed a slight bug with refraction and tested a more dynamic scene with different fluid params, looks pretty amazing 😳

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Mykhailo Moroz

@Michael_Moroz_

2 years

Zibra Smoke&Fire is pretty much perfect for creating cool ambient volumetric effect, in fact that's what I usually like to do, just mess around with a few point lights trying to make something pretty🤔

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Mykhailo Moroz

@Michael_Moroz_

3 years

So I discovered that you can make super tiny SIREN networks representing SDF's that can be hardcoded into a single shader! blackle has made a shadertoy with such an example for a stanford bunny: I've decided to put it inside of my path tracer to test it

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Mykhailo Moroz

@Michael_Moroz_

4 years

Toy model of a self-gravitating gas.

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Mykhailo Moroz

@Michael_Moroz_

4 years

What's better than crazy graphics bugs? Crazy physics bugs 🙃👀

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Mykhailo Moroz

@Michael_Moroz_

8 months

Took me a day, but here it is, the particle cluster grid SPH fluid now in 3D.😤 It is probably the highest res 3D liquid sim in shadertoy, considering the ~1.5 particles per voxel. Wonder if I can improve the render, takes a large chunk of the frametime.🤔

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Mykhailo Moroz

@Michael_Moroz_

8 months

After fine tuning the rest density, smoothing radii, and viscosity algorithm, changing the merging and splitting a bit - the results are astonishingly good. Perhaps its time to do a 3D version of this. And there are no particles here, just a grid🤯

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Mykhailo Moroz

@Michael_Moroz_

4 years

I have finally implemented exact particle number conservation with the CA particle algorithm. This allows me to make a simple and really fast MD simulation. You can see the crystalline structure as well as the crystal defects here.

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Mykhailo Moroz

@Michael_Moroz_

2 years

Working on a multiple particle type system. Now different particles can have different physics! #ZibraLiquids #realtimeVFX #unity3d #Simulation

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Mykhailo Moroz

@Michael_Moroz_

4 years

I wanted to do this for quite some time - here is my first blog post! It's explaining the grid particle algorithm and how to implement fluid simulations using it. I used it for pretty much all of my latest simulations(including the fluids and slime molds)

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Mykhailo Moroz

@Michael_Moroz_

8 months

Actually decided to try improving the anisotropic stuff, and also added some PBR as well as reflection ray tracing, but holy crap I didn't expect it to look THIS good🥵

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Mykhailo Moroz

@Michael_Moroz_

2 years

Did some improvements to the WebGL water caustics. Now I compute the derivatives in texture space(with a precomputed texture), instead of ddx/ddy. It produces waaay smoother results, on top of that I also use a 512^2 caustic mesh, which looks really pretty.

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Mykhailo Moroz

@Michael_Moroz_

8 months

I think this is the last Shadertoy demo for now. Fixed some issues with SPH and added proper refraction rendering. 🧐 Getting any better than this would probably require anisotropic kernels (gaussian splats??)

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Mykhailo Moroz

@Michael_Moroz_

2 years

Implemented the Position Based Fluids paper by Miles Macklin et al.🤔 Optimizing particle simulations is a true pain, and using groupshared memory is even harder. I needed to sort particles along the Hilbert curve for this to work. 💀 Right now I can run 8M particles at ~40fps.

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Mykhailo Moroz

@Michael_Moroz_

8 months

Added full internal reflection to the rendering 😳 (basically second bounce after refraction)

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Mykhailo Moroz

@Michael_Moroz_

2 years

Testing multibounce refraction, fluid-fluid occlusion should look a tad bit better now. Also 0g droplets with mesh rendering look pretty cool.

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Mykhailo Moroz

@Michael_Moroz_

1 year

Lately I've been trying to solve the multielectron Schrodinger equation using neural nets. In the video below you can see 2 hydrogens having a energy minimum at some distance thus creating a chemical bond.

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Mykhailo Moroz

@Michael_Moroz_

3 years

Turned out my path tracer was totally broken for refracted rays(total internal reflection wasn't working), also the samples were accumulated with a lot of bias(to reduce noise), after fixing those I got some really stunning renders of fractal glass!

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Mykhailo Moroz

@Michael_Moroz_

2 years

I kind of think at a larger particle scale, and thanks to having the mesh render, with the higher performance the liquid kinda feels more realistic. Also there is enough liquid to flood the entire room. Underwater render is still WIP. Also would be nice to add foam particles.

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Mykhailo Moroz

@Michael_Moroz_

4 years

Refining the slime mold simulator, getting some cleaner patterns this time

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Mykhailo Moroz

@Michael_Moroz_

2 years

The splashes with the new smoothed mesh look pretty neat

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Mykhailo Moroz

@Michael_Moroz_

3 years

The path tracing adventure continues, I've figured out how to extend direct lighting to refracted rays, now I can kinda render sun caustics🤯 (here's the shadertoy, you need a beefy-ish GPU )

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Mykhailo Moroz

@Michael_Moroz_

3 years

#define V vec3 #define f for(int i; i<9; i++) V p=V(0,9,50.+fract(FC.x*.5+FC.y*.3)),a,l,x;a++;f f {f {x=p-V(0,i,0);x.xz*=rotate2D(t);V z=x.zzz*.1;f z=V(z.x*z.x-z.y*z.y,2.*z.y*z)+x*.1;l*=x=dot(z,z)<4.?V(.6,.7,.8):V(1);}o.rgb-=l*x-l;p+=V(FC.xy-r.xy*.5,-r)/r.x;l=a*=x;}#つぶやきGLSL

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Mykhailo Moroz

@Michael_Moroz_

2 years

Added motion blur to the foam particles

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Mykhailo Moroz

@Michael_Moroz_

3 years

The last few weeks I've been working on optimizing the Zibra fluid solver, replaced the bitonic sort with a radix sort, P2G is now on atomics and rewrote the particle render. All in all I got a 3.5x performance improvement. Now I can do 3M particles in real time (~40fps on 2060).

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Mykhailo Moroz

@Michael_Moroz_

1 year

Made another small demo using This time I've used atomics to build a grid of lists of particles in sections of the screen, to then loop over them and compute the color. Can be used for good bokeh. (although I wouldn't call this…

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Mykhailo Moroz

@Michael_Moroz_

3 years

Made a spectal forward light tracer in shadertoy. Basically tracing rays not from the camera, but from the light source and then rasterizing them onto the screen. Compared to path tracing this can easily render laser rays

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Mykhailo Moroz

@Michael_Moroz_

4 years

Improved the CA neo-hookean solver, now should be stable more or less and be more accurate. For a test tried to model some rocky stuff, still jiggly a bit, but looks good. Blue glow shows the strain energy.

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Mykhailo Moroz

@Michael_Moroz_

2 years

Carpet???

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Mykhailo Moroz

@Michael_Moroz_

3 years

Messing around with volumetric rendering this time. I wondered if reprojection will work for volumetric stuff, assuming a density isosurface, and it does work, even if not 100% correctly. Also the lights are importance sampled by distance.

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Mykhailo Moroz

@Michael_Moroz_

8 months

Tried to implement the method described in the "Reconstructing Surfaces of Particle-Based Fluids Using Anisotropic Kernels" paper for better surface smoothness. It got quite a lot more expensive, while also being sometimes unstable, not sure if worth it

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Mykhailo Moroz

@Michael_Moroz_

2 years

Started prototyping foam simulation for Zibra Liquids. Need to look up more on foam physics, but seems to look nice even now👀

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Mykhailo Moroz

@Michael_Moroz_

7 months

Made a really weird fractal flame based on a mandelbulb, looks like a moving stardust cloud. (oh the codec aint gonna like this video...) Keeping the rng seed constant and varying the params makes the points move in interesting ways

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Mykhailo Moroz

@Michael_Moroz_

1 year

Lots of people were asking how exactly does the cloth simulation work. I'll try to explain it in detail. The simulation itself runs using a Custom Render Target, its a weird asset inside of Unity that can execute shaders if its used as a texture on any object in the scene.

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Mykhailo Moroz

@Michael_Moroz_

2 years

Improved the stability and performance of the GPU molecular dynamics solver. Around 1.5ms for 1M particles per iteration on a 3070. Not going to lie, this is really fun to play with. I wonder if one can make a game out of this🤔

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Mykhailo Moroz

@Michael_Moroz_

2 years

So yeah, thanks to #Putin I can't really work on the liquid sim right now. And I was planning to work on some performance improvements, oh well. For anyone worried, I'm fine, and currently in western Ukraine. So for now I urge everyone to #StandWithUkriane to stop this war!

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Mykhailo Moroz

@Michael_Moroz_

3 years

Tried to add volumetric path tracing to the mix to visualize the caustics, it takes like 50x more time to converge uh, so I was only able to render low res images, but here it is

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Mykhailo Moroz

@Michael_Moroz_

2 years

More tests with multiple liquid types with different gravity and different color😳

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Mykhailo Moroz

@Michael_Moroz_

2 years

Currently working on improving the way foam looks. Since the foam lacks high frequency detail I've decided to add a flow-map based on a few octaves of some Worley-like noise. Should improve the way the liquid looks with a low resolution simulation.

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Mykhailo Moroz

@Michael_Moroz_

3 years

I've been collecting interesting shadertoys into a few playlists, might be interesting to someone Reintegration tracking Cellular automaton particles Fluid solvers Wave equations (1/2)

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Mykhailo Moroz

@Michael_Moroz_

2 years

Decoupled the performance from the hash grid resolution, now the speed only scales with the particle count. Meaning I can use an absurdly large hash grid like here! 250M voxels (1024*1024*256). Of course it still takes up a ton of VRAM, but oh well.

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Mykhailo Moroz

@Michael_Moroz_

3 years

Combined MLS-MPM with Reintegration tracking, took some time to figure out why it was unstable, but now it seems to work, the velocity is advected really nicely, also the vortices are conserved for a relatively long time. Shadertoy implementation:

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Mykhailo Moroz

@Michael_Moroz_

2 years

A 4M particle fluid simulation if quite a bit more responsive of course, I guess it looks more impressive that way

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Mykhailo Moroz

@Michael_Moroz_

3 years

Visualizing light propagation with time

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Mykhailo Moroz

@Michael_Moroz_

2 years

Lately I've been trying to make a nonlinear wave equation simulation in curved space. That took way too much time, but I finally got something that seems to work. The wave equation behaves similarly to a liquid, and it's orbiting a Kerr-Newman black hole. Wave accretion disk?👀🤨

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Mykhailo Moroz

@Michael_Moroz_

1 year

Decided to mess around with path tracing a bit, since I haven't done that in like literally forever. I've also been wondering about rendering SDFs as voxels using DDA, so I tried that, while also proportionally (to SDF) skipping voxels for performance.

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Mykhailo Moroz

@Michael_Moroz_

2 years

Messing around with general relativistic FLIP simulations. Not sure FLIP is applicable to relativistic equations of motion, but seems to work more or less. In the simulation I've put a 45deg offset accretion disk around a spinning Kerr black hole (a = 0.95). Looks pretty cool 👀

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Mykhailo Moroz

@Michael_Moroz_

8 months

Added shadows and some basic surface shading. Looks a bit closer to a liquid now. Next I might try to actually ray trace the iso-surface and trace the refractions too (RIP GPU). Wonder how that will look like.

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Mykhailo Moroz

@Michael_Moroz_

2 years

Finally started implementing color mixing👀Still a lot of work ahead #ZibraLiquids #Simulation #VFX

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Mykhailo Moroz

@Michael_Moroz_

2 years

Point light sources can also be used to make all kinds of cool volumetric effects like these

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Mykhailo Moroz

@Michael_Moroz_

2 years

Messing with some basic GPU molecular dynamics simulations. Haven't done this in a while. Also first time doing it properly in 3D 👀. GPUs are pretty damn powerful. Also you can see some nice crystal structures here.

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Mykhailo Moroz

@Michael_Moroz_

2 years

Finally working on a proper terrain collider for Zibra Liquids! Took quite some time to get to it even though its relatively simple to implement 😅

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Mykhailo Moroz

@Michael_Moroz_

4 years

Visualizing the velocity field of those cell like things.

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Mykhailo Moroz

@Michael_Moroz_

3 years

Improving the volumetric path tracing. Added anisotropic scattering and a better sky model. Fractals inside a fog look really awesome! (even tho take a lot of time to render)

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Mykhailo Moroz

@Michael_Moroz_

3 years

So I thought I'd jump from physics to rendering a little bit. Inspired by Nvidia's spacio-temporal reservoir resampling I made virtual lights by fitting the incoming light using a gaussians and importance sampled that. That allowed to path trace stuff like caustics in real time.

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Mykhailo Moroz

@Michael_Moroz_

2 years

Doing some performance tests 🤔

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Mykhailo Moroz

@Michael_Moroz_

2 years

Spinning up a droplet #ZibraLiquids #realtimeVFX #unity3d #Simulation

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Mykhailo Moroz

@Michael_Moroz_

8 months

Interestingly enough, when putting a particle density waaaay higher than the number of cells, you get constant splitting of the particles, untill they fill all of the space.

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Mykhailo Moroz

@Michael_Moroz_

3 years

Messing around with a really large simulation grid (400*400*60, > 1GB of VRAM). Now I'm computing the SDF only around the fluid, so now it is much faster for such grid sizes, and kinda works in real time on a mobile RTX2060. I think there is still potential for optimization tho.

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