[Sidefx-houdini-list] Varying the smoke density

Louis Dunlevy louisdunlevy at gmail.com
Sun Aug 30 21:09:04 EDT 2009


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..

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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