Fluid Paint Simulation

http://david.li/paint/

by anonfunction • 9 years ago

605 87 9 years ago

david.li

anonfunction• 9 years ago

Source code: https://github.com/dli/paint

haxiomic• 9 years ago

Great stuff! Reminds me of Verve Painter[1], which is a fleshed out fluid-simulation-based oil painting app

[1] https://www.youtube.com/watch?v=PBO2hNv_tTE

santaclaus• 9 years ago

Cool! Any idea what model or method is used here (or is it heuristic)?

dorianm3• 9 years ago

It's open source ;) https://github.com/dli/paint

jonr82• 9 years ago

A quick look at the source code seems to suggest Li's work is based on Mark Harris' GPU implementation (with Jacobi iteration) of Jos Stam's method. Ref: http://www.expresii.com/blog/innovations-in-digital-painting...

mistercow2• 9 years ago

This is very cool. One thing that I think could be improved: It looks like the model is treating the white background as if it is also paint. This leads to some weird results when painting over existing strokes.

Really awesome work though.

fake-name• 9 years ago

This could be intentional. It's a fairly common technique to paint on top of a wet white basecoat[1].

[1] https://en.wikipedia.org/wiki/Wet-on-wet

mistercow2• 9 years ago

Hmm, good point. I'm guessing it also makes the model a lot simpler.

roesel• 9 years ago

20 seconds of drawing with default parameters and laptop temperature went from 40 to 70 °C. Not bad :D.

Nice work though, very beautiful and realistic.

tucaz• 9 years ago

Holy moly! Awesome work. It looks very realistic. Congrats!

mholt• 9 years ago

His other work is cool too: http://david.li/

lumberingjack• 9 years ago

the green Vortex Spheres maxed out my gtx 1070 what the heck

slavik81• 9 years ago

It appears to be some sort of fluid simulation.

ehsankia• 9 years ago

Tried to open it on my Chromebook. Ouch.

Asooka• 9 years ago

Outright crashed my firefox :) Seems to be very demanding.

egeozcan• 9 years ago

I have a 1080 and didn't even turn on the fans. Something is wrong.

jayajay3• 9 years ago

This is a great share. The Fourier example is a great way teach about Fourier series and decomposition. Very cool!

jefe_• 9 years ago

Amazing how well it handles painting on top of previous strokes.

tantalor• 9 years ago

Touch event support please!

superplussed• 9 years ago

Amazing. It seems like it'd be really useful to be able to zoom in and out as well.

olegkikin• 9 years ago

Doesn't have dark colors. The darkest paint is brown.

tracker12• 9 years ago

the box in the middle of the color picker is saturation and lightness, drag towards the left on the top of the box to reduce the brightness downward.

esrauch• 9 years ago

The darkest color comes out as brown for all colors though.

kepano• 9 years ago

This seems obvious but somehow I never considered that you need three dimensions to replicate the feel of most paints.

fjdlwlv• 9 years ago

If you are accustomed to seeing prints and photos and computer scans, it's easy to overlook how oil paint is like a sculpture. Watercolor, not so much.

heurist• 9 years ago

Pretty cool. Next step is mixing colors and different thicknesses like real oil :)

aperrien• 9 years ago

This reminds me of Bob Ross and his "Happy Little Trees". I think I could paint some on here if the canvas were bigger, and there was an area off to the side to mix the paint.

throwaway2016a• 9 years ago

Very nice work. Reminds me a lot of Corel Painter.

Justsignedup• 9 years ago

Fantastic. One criticism. On click please make the paint "dip" and paint, and the paint on the brush should wear out. Then it'll really feel like painting. Click again is to re-dip in the color of choosing.

This will even let for mixing of colors like on a painter's palette.

:) Very nice tool.

thomasjudge• 9 years ago

To "really feel like painting" for me it would have to simulate spending hours with blue tape, spilling on my shoes, making multiple trips to home depot... sounds like a job for VR... ;)

Ono-Sendai• 9 years ago

Cool. Something like this could combine nicely with my automatic painting algorithm: http://www.forwardscattering.org/post/42 http://www.forwardscattering.org/post/44

pacaro• 9 years ago

See also FreshPaint on any version of windows > 7

zokier• 9 years ago

You can compare this to what I believe is the state of the art system, "Wetbrush":

https://www.youtube.com/watch?v=gwyqh4d-WU8 (SIGGRAPH Asia 2015)

https://www.youtube.com/watch?v=k_ndr3qDXKo (Adobe demo)

pavlov• 9 years ago

Of commercial applications, Corel Painter remains the professional natural media paint tool:

http://www.painterartist.com/en/product/painter/

It's been around for about 25 years and some of the UI is a bit creaky, but on the upside, it's pretty fast on modern desktops and it still gets regular updates. Brush strokes with 3D depth ("impasto") were introduced a long time ago, maybe late '90s.

DaveSapien• 9 years ago

Also, here is an example of one of mine. Its pretty old now but runs really well on old ipads: https://www.youtube.com/watch?v=BbbQk9JK2OY Also been developing a (super fast) paint system for Unity mobile/VR: https://twitter.com/DaveSapien/status/800044501159079937 ....and here is another one of my paint systems for a new game I'm working on: https://twitter.com/DaveSapien/status/791628287915196416 Hope you like!

fonosip• 9 years ago

A similar app without opengl (for ipads and such) http://ba.net/util/finger-oil-painting/

supercoder• 9 years ago

iPads support WebGL / OpenGL just fine

bsaul• 9 years ago

Interface doesn't seem to work on an ipad ( maybe because of event handling though)

nilved• 9 years ago

This is too slow to use on my MacBook... I like the idea though, and it seems really cool.

robodale• 9 years ago

My MacBook Pro sounds like it's taking off a runway :P

divbit• 9 years ago

This is great for calligraphy with surface pen - can't find the black ink though.

Jordrok• 9 years ago

Very cool!

Man, does it peg the hell out of the CPU though! :P

exDM69• 9 years ago

It was hogging about 60% of one CPU core (Skylake i7) on my PC. Seems like it's re-drawing the screen at 60 fps even though nothing is happening. Should be an easy fix.

ffwacom• 9 years ago

so cool, consider adding an option to remove paint from the brush so you can scumble the fluid to blend.

kdamken• 9 years ago

I feel like you deserve the nobel prize for this or something. Mind = blown

overcast• 9 years ago

Looks sweet, but the paint definitely continues sliding in the direction of the stroke for too long. Paint basically just sticks immediately where you put it, it doesn't have that type of momentum. Even at the lowest fluidity level.

amelius• 9 years ago

What primitives is this using?

btzll2• 9 years ago

Very cool, but please change the color selector. It is not intuitive, and it's very hard to pick even the most obvious colors.

bkanber2• 9 years ago

That's a pretty common HSL-style color picker. It's great for artists and designers who think in those terms. Curious, do you have much experience in graphic design, or no?

btzll2• 9 years ago

I have zero experience in graphic design, but I do not think the simulation is made for designers.

andyfleming• 9 years ago

This is pretty impressive. It'd be really neat if the paint slowly dried!

beders• 9 years ago

Who would like to watch that? ;)

ww5202• 9 years ago

Computer can always speed that up.

shankar_mj• 9 years ago

Wow !

marai2• 9 years ago

This is oddly therapeutic and calming. My Macbook CPU was just fine as well. Very cool!

huangc10• 9 years ago

Was playing with your other projects too. Great stuff and super fun. Sharing.

cr0sh• 9 years ago

I can't paint or draw worth beans - but I like it!

kin• 9 years ago

At first I was like, "Wow, this is a cool effect, let's try a different col-- HOLY SHIT". Color me impressed!

chris_st• 9 years ago

Another "natural paint" painting program is ArtRage [1]. They have, bar none, the friendliest, most supportive discussion forums I've ever seen on the internet.

Oh yeah, the painting program's pretty good too :-)

[1] https://www.artrage.com

ww5202• 9 years ago

This is awesome. 3D work really have the wow factor. This is definitely at the WOW level.

Edit: I would say couple this with VR and it would be a truly awesome experience.

jayajay3• 9 years ago

Like MS Paint, but for VR. Interesting, the "websites" of VR will be worlds... I can totally see people throwing in this kinda stuff "just because wow new technology" in the same way that websites back in the 90s threw in snowflakes falling on the screen, custom pointers, epileptic lighting, audio, flash, etc.

zachrose• 9 years ago

I really hope web concepts move gracefully into VR. I suppose "immersive location" is just like a URL and full-VR experience is just another Content-Type.

BuffaloBagel• 9 years ago

Did you mean to use the term fluidity rather than the term viscosity? I believe they are mathematically inverse.

noonespecial• 9 years ago

Very nice. Lots of fun. The only thing missing is that the paint doesn't mix, ie. yellow and blue don't turn greenish etc.

quakeguy2• 9 years ago

With Opera 43.0.2442.806 (PGO) i cannot do a stroke at all it seems. Just reporting.

mfx• 9 years ago

Hitting a bandwith limit?

quakeguy2• 9 years ago

Hardware Limit it seems, doing this on a Lenovo minimun laptop, maybe OGL is outdated.

dorianm3• 9 years ago

You can report on the GitHub repo: https://github.com/dli/paint/issues

mfisher87• 9 years ago

Reminds me of Verve. I watched the author's channel on Youtube religiously, hugely enjoying his video demos with each new release. Sad to say there hasn't been one in like 2 years.

https://www.youtube.com/user/333taron/videos

snailmailman• 9 years ago

Oohh! i was looking for this! i remember seeing this a few years ago and being really impressed. It looks pretty good, although im not much of an artist so i dont know how it compares to the paid competition. The UI could use some work though.

it took me a while to figure out but im having a lot of fun with it. performs surprisingly well for me on only an intel integrated card.

mshenfield• 9 years ago

Color me impressed

dorianm3• 9 years ago

I loved it, I feel like it could make some nice backgrounds and decorative paintings will a little more tries: http://imgur.com/a/XBUgn

And it's open source: https://github.com/dli/paint (I posted my issues there)

craigleehi• 9 years ago

Here is another eastern watercolor painting tool "Expresii"[1].

[1] http://www.expresii.com

devwastaken• 9 years ago

Quite nice, though the paint colors don't combine like they do in this kind of oil painting. Can't make bob ross art without that. Also when you try to paint on the edges, the brush goes away, so its difficult to make a full picture without making it larger, and then cropping down.

ygra• 9 years ago

Reminds me of https://www.microsoft.com/en-us/research/project/project-gus... with later became Fresh paint.

_Codemonkeyism• 9 years ago

Like that, though I wish it would work with FF/Win10/XPS13 touch screen.

jonr82• 9 years ago

See a history of fluid sim applied to watercolor-like painting: http://www.expresii.com/blog/innovations-in-digital-painting... A quick look at David Li's source code seems to suggest Li's work is based on Mark Harris' GPU implementation (with Jacobi iteration) of Jos Stam's method.

koliber• 9 years ago

I can't seem to create anything beautiful worth sharing with this. But damn, it is soothing and relaxing to play with. It feels almost therapeutic! Thank you!

joakleaf• 9 years ago

Is this using Navier-Stokes based fluid simulation?

bsenftner• 9 years ago

So bizarre: I saw this post last Saturday, loved the site and David.il's other pages, showed some friends... Then I could not find the HackerNews post again. Here it is now, yet it says it was posted within a day, with no history of being posted before. Odd...

FreeFull• 9 years ago

Perhaps it was deleted for some reason, and posted again? I definitely remember seeing it here earlier.

lkbm• 9 years ago

https://news.ycombinator.com/item?id=13589074

Not surer why it's not showing when you search. I got here by using HN search for the URL and picking the one with more comments--both showed up for me.

j_s• 9 years ago

Click on the domain to see all previous posts.

https://news.ycombinator.com/from?site=david.li

The most recent was missing the word "Simulation", so clicking on the "past" link does not show it since that is a search by all words in the title.

itomato• 9 years ago

This is more of a 'mop' than a 'paint brush'.

Fluid Paint Simulation

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