Foam generation from Ocean Geometry

[bifrost]

Hey people! Recently I posted here asking suggestions on generating Gigantic Ocean Waves using geometries and people here were more than helpful. I am quite close to the result i.e, I will have a custom rigged ocean wave in a day or two. 

 

On to the next question that I wanted to ask. What would be the approach to generate particles from the geometry?! It's an ocean geometry so there is no flip involved and as a result there are no collisions. So what would be your approach to generate particles(foam) from this? I know I would need a trail SOP to compute velocity but what after that? How would you derive particles after? 

 

Ludwig Von was kind enough to share this paper with me which helped a lot in understanding a lot of concepts. 

 

https://renderman.pixar.com/view/wave-effects-on-surfs-up

 

-bifrost

[rbowden]

This thread could give you some ideas:

http://forums.odforce.net/topic/13241-foam-patterns/

-Ryan

[bifrost]

This thread could give you some ideas:

http://forums.odforce.net/topic/13241-foam-patterns/

-Ryan

 

Hey Ryan! I did come across that thread yesterday but it mainly talks about how to generate patterns on the surface and similar techniques. 

What I have is a geometry moving across 3D space like a wave. See the screenshot below. And I want to generate foam where the wave is touching the ocean surface. 

 

EDIT - In short, I need to isolate the self intersecting area from that geo so that I have an area to work with to emit particles out from.

 

EDIT 2 - So whitewatersource node, I need to find a way so it takes into account the geometry. I have tried with computing velocity and building SDF but no luck. Any clues regarding this?

 

-bifrost

Edited March 15, 2016 by bifrost

[Navneet Arora]

i think based on the y pos you can isloate your part where you want to emit foam or spray particles, i still dnt know how you would go around with the curvature but y pos could be a kick start thing. 

Good luck

[bifrost]

i think based on the y pos you can isloate your part where you want to emit foam or spray particles, i still dnt know how you would go around with the curvature but y pos could be a kick start thing. 

Good luck

 

I did that using "invalid polygons" in PolyDoctor node. The node automatically calculates self intersecting areas and isolates them under the visualisation tab. Pretty neat trick. 

Now towards controlled particle emission. 

[Ahmed Saady]

Well i would love to know also how to do same of this effect and i was going to write about it today.

So i hope if we can find good answers about this here.

 

Thank you