r/Simulated • u/CaptainLocoMoco Cinema 4D • Dec 31 '19

RealFlow First fluid render in Octane.

https://gfycat.com/parchedimpishiggypops
4.0k Upvotes

97% Upvoted

37 comments sorted by

68

u/brunoticianelli Dec 31 '19

Why all fluid simulations has this big 'splasshy' liquid in the first hit?

36

u/CaptainLocoMoco Dec 31 '19

Imagine yourself pouring a big stream of water into a bath tub. At first the water will spread across the surface very quickly and ride up the walls. So long as the stream is present, the area where the stream is hitting the tub will create a zone that pushes all existing tub water away. Initially (when the tub is empty) the water has only the tub walls to collide with, but eventually the tub walls are covered in a layer of water, which dampens the incoming water. That's why there is a big initial splash, then the splash dissipates.

23

u/Super_Ham Dec 31 '19

I work a lot in blender but I assume it’s the same for octane.

A lot of the time you can’t really get a good idea for the scale of the simulation and the velocity of the liquid flowing is often pretty fast so that you intentionally get that ‘splassshy’ effect.

6

u/clb92 Dec 31 '19

Octane is just the renderer used. The simulation was made with RealFlow, according to the tag of the post.

24

u/Macula-Densa Dec 31 '19

I seriously need an ELI5 on how these simulations are made. Like is there physics involved ? Are creators programming the physics themselves? Are they using prebuilt engines? Like wtf is going on here?

28

u/CaptainLocoMoco Dec 31 '19

The vast majority of the posts on our sub are made with prebuilt engines (mine included). Typically people use one software to create the simulation data (in my case the water), then export to another software for texturing, lighting, and rendering. I used RealFlow to create my water, and Octane render in Cinema 4D to actually render it out to an image sequence.

If you'd like to get started, I would suggest checking out Blender. It's free, and you can find many tutorials on YouTube.

6

u/DramDemon Dec 31 '19

Prebuilt engines are programmed by someone, so yes, people program physics into engines and applications.

1

u/notimeforniceties Dec 31 '19

Yes, but that typically not the people creating renderings with those engines.

2

u/tcdoey Dec 31 '19

Curious; how long did this take to sim and render?

5

u/CaptainLocoMoco Dec 31 '19

Simulation took under an hour. The render took about 11 hours. Both were done on a 1080Ti

2

u/jbakers Dec 31 '19

At least six time.

165

u/shadows_bane1 Dec 31 '19

woter

55

u/WorseThanHipster Dec 31 '19

wourder

38

u/Rpanich Dec 31 '19

Brad?

17

u/[deleted] Dec 31 '19

I’d die for Claire from the test kitchen

7

u/[deleted] Dec 31 '19

walter

10

u/[deleted] Dec 31 '19

wooder

4

u/invictus81 Dec 31 '19

r/waterniggas called?

4

u/[deleted] Dec 31 '19 edited Dec 31 '19

r/hydrohomies now.

6

u/JesW87 Dec 31 '19 edited Dec 31 '19

I will not betray the old ways, you monster

3

u/shadows_bane1 Dec 31 '19

dunno why you're gettin downvoted

2

u/invictus81 Dec 31 '19

Dunno, friendly reminder to stay hydrated

-1

u/Arthur_The_Third Dec 31 '19

BROOOOO HE SAID WATER HAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHHAHAHAAHHAHAHAHAHAHA I'M WHEEZING HAHAHAHAHA

1

u/[deleted] Dec 31 '19

Are you trying to make a point, or are you having a stroke?

1

u/Krillkus Dec 31 '19

mMmm hot worter

28

u/PMiguelez Dec 31 '19

This subreddit is almost an r/oddlysatisfying

5

u/[deleted] Dec 31 '19

I like it a lot fren

1

u/Raumschiff Dec 31 '19

The three unflushable turds.

1

u/frank_reynolds__ Dec 31 '19

I wish the columns were made of sand and the water eroded them away until they fell over. Would be a neat simulation.

1

u/yedeiman Dec 31 '19

That looks great.

1

u/[deleted] Dec 31 '19

Can’t wait till this is in a video game and the minimum specs include a quadro rtx 8000 and the recommended specs include nvlink and a 5000 dollar 4 processor motherboard lol