[Sidefx-houdini-list] Varying the smoke density

François Duchesneau sidefx at trinix.ca
Sun Aug 30 23:32:33 EDT 2009


Hi Louis,

I haven't totally understood the Sop Scalar Field and how to use it in 
that context but the point method works like a charm. I think I'm gonna 
use that a lot since it's very flexible.

Thanks

François

Louis Dunlevy wrote:
> Hey,
>
> If you have a bunch of points in SOPs flagged as particles (see the nice
> Add sop) you can use that to emit density. Pscale is varying radius,
> Alpha is a density multiplier and v is mapped to vel in the fluid sim.
> You can use a SOP Geometry Dop to bring the points in and a Source
> Relationship dop to use them as emitters.
>
> Or use a SOP Scalar Field dop..
> L
>
> François Duchesneau wrote:
>   
>> Hi all,
>>
>> I want to vary the smoke density emitted in a voxel fluid. First, I 
>> don't know how to do that with "Source From Objects" without using the 
>> pyro tool. With pyro tool I can vary it as a whole but let's say I want 
>> to vary it per emitter. By the way it looks like the pyro tool doesn't 
>> allow you to have more than one emitter anyway by default.
>>
>> I tried to read an sdf created in sop in the "Static Object" used as the 
>> emitter but it doesn't make sense to vary density on an sdf. Either I 
>> have to find a way to pass directly the density field from sop to the 
>> solver or to be able to manipulate the density field in Dop.
>>
>> Thanks
>>
>> François
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