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dennisvolkerts

creating white water on cached fluid

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hi.
I was wondering how to generate white water on cached fluids.
Maybe im doing something wrong. I cached my flattank_fluid to .bgeo but white water wants fluids.
Any help?

 

thnx

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Would need to see your scene .

It´s really impossible to know.

 

Are you using the shelf tools ?

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hi,

thnx for your fast reply.

yes im using the shelf... In the help file of Houdini they say you MUST use it and not try to build it from scratch.

 

but the white water only seems to work on fluids not on geo
i have add a quick example

my scene is to big to submit here i think

 

thnx

white water from cache.hipnc

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Cache it out from the DOP I/O SOP at the top instead. Right now you are caching out the visualization of the particles.

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Cache it out from the DOP I/O SOP at the top instead. Right now you are caching out the visualization of the particles.

you mean the explicit cache?

post-8303-0-48996200-1402095999_thumb.jp

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It does work fine from cached bgeos, you'll need to feed it:

- flip particles

- surface volume

- velocity field [3] volume

 

So if you cache the raw output from the fluid sim it should work (i.e. do a Dopimport fields, and add your surface and velocity fields to it as well. this is the default setup if you use the shelf tools). If you feed it just the points it wont' work.

 

P.S. you can cache the raw output from the fluid sim as mentioned above (immediately after the dopimport with the surf+vel fields) or what I've been doing is separating the surface volume and velocity volume and points, caching each of them to separate files / folders. In fact reducing the particle count to about 10-20% and then caching them. So I don't get 1GB per frame files but much more manageable. Of course you lose resolution on your particles if you wanted to render them, but I don't so I don't care, and I'm low on space :). For the white water sim if you just merge the three streams with a standard merge tool and feed that, it still works fine. Example hip attached.

 

 

 

fluid_tests.00004.hipnc

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Hi Memo!!
Thnx!!! that did the trick. I wass caching out the dop import node  instead of dop I/O

dont realy understand what the difference is between those nodes except that I know that  with the dop I/O you can get the vel, surface and geodata.

 

You helped me alot!

thnx

Edited by dennisvolkerts

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It does work fine from cached bgeos, you'll need to feed it:

- flip particles

- surface volume

- velocity field [3] volume

 

So if you cache the raw output from the fluid sim it should work (i.e. do a Dopimport fields, and add your surface and velocity fields to it as well. this is the default setup if you use the shelf tools). If you feed it just the points it wont' work.

 

P.S. you can cache the raw output from the fluid sim as mentioned above (immediately after the dopimport with the surf+vel fields) or what I've been doing is separating the surface volume and velocity volume and points, caching each of them to separate files / folders. In fact reducing the particle count to about 10-20% and then caching them. So I don't get 1GB per frame files but much more manageable. Of course you lose resolution on your particles if you wanted to render them, but I don't so I don't care, and I'm low on space :). For the white water sim if you just merge the three streams with a standard merge tool and feed that, it still works fine. Example hip attached.

 

Thanks for the example and the info :D

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i wa just trying to figure it out myself when i bumped into this forum threads.
Just wanted to say i never seen such an awesome community of users and helpers, the scene files are absolutely great way of understanding, i wish i could help too but i am just a rooky for now, so THANK YOU immensively for all U do and the time U spare for.
 

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