[Sidefx-houdini-list] Guided Ocean sim

François Duchesneau sidefx at trinix.ca
Sat Mar 12 14:34:56 EST 2016

What do you mean by, an .abc of that sim? If you're referring to the 
ocean toolkit water pattern generation, well you have it live to deform 
any geometry you pipe into the same Ocean Evaluate that you used to 
generated the map for your MR render.

Regarding the foam, I wasn't very happy with the foam generated from the 
Ocean Evaluate and I used my own particle sim emitted from the Ocean 
Evaluate. I get more details, more control and it simulates faster while 
still being emitted at the cusp of waves. I do it on a flat grid 
matching the Ocean Spectrum size starting with a reasonable amount of 
polys. Then I delete all polys that are out of range of the cusp 
attribute. From there I scatter points and do the same process, this 
time the Ocean Spectrum gives me a more precise cusp attribute on those 
points. This becomes my emitter. I then render this flat particles sim 
on a texture that will match the ocean toolkit setup.

For my shots I had boat splashes for like 500 boats so I came up with a 
system where I made a boat splash flat from the center of the world and 
snapped it everywhere a boat was, adapting again on the ocean surface 
just by using the same Ocean Evaluate.

If you're talking about wave splashes then you can deform a mesh and use 
a technique similar to the foam approach but not on a flat grid. I 
haven't had to do that either but I thought Houdini had a shelf tool for 
that kind of effect.

Hope it gives some ideas for different options.


On 03/12/2016 01:59 PM, Gary Jaeger wrote:
> Ok, so I’m tired of banging my head against the Bifrost wall. Probably less a Bifrost issue than a Autodesk documentation issue, but either way…
> So assume we have an ocean render (generate with Houdini Ocean Toolkit, render in mr) that we’re happy with. Is it possible to use an .abc of that sim and in Houdini just add splashes and foam? What would that workflow look like? I’ve poked around and found a few threads from a few years back nothing exactly like this.
> Thanks so much
> Gary Jaeger // Core Studio
> 249 Princeton Avenue
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