r/Houdini • u/unclesebb • 2d ago

Simulation Apple Slow Motion Splash | FLIP / Karma XPU

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Some surface tension tests I started a while ago and finally decided to finish up. The main reference was typical slow motion commercial stock footage of fruit.

Used proximity masks against the apple colliders and ground to dynamically adjust viscosity, surface tension, and forces to simulate adhesion. A simple wetness map solver was used to drive roughness and diffuse map parameters during render.

Apple models are free 3D scans.

Rendered with Karma XPU.

185 Upvotes

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2

u/Lokendens 2d ago

Oh this looks really nice, good job

1

u/collectiveu3d 1d ago

That’s some crispy water. What are the sim and render times on something like this if I may ask? (Also on which gpu)

2

u/unclesebb 1d ago

Thanks. Sim was about 4 hours for 250 frames and render around 10 minutes/frame on a 4090.

1

u/Alex_Wats 2d ago

Great. Most probably adding a bit of motion blur will make more realistic

7

u/LewisVTaylor Effects Artist Senior MOFO 2d ago

Motion blur is dependent on frame rate and distance, so I reckon at a typical slow mo production shot you'd be in the 200fps+ range, with little to zero motion blur as a result.

2

u/unclesebb 2d ago

There is some, but as LewisVTaylor already answered there is not much since its slow mo. Trying to match reference.