Hi all,

Been struggling with something recently that I can't seem to easily solve.

I come from a Softimage ICE background.
A typical thing we would do is test if something is inside a null or inside some other geo, and then delete or do something to the data inside. In the case of particles, we would test if they were inside a null, then if (using an IF node) they were, we would hook up a delete node.

Is there a similar way (read EASY) to do this with a volume smoke sim on
the gas density? I want it to reduce if it is inside a null or a sphere or some type of thing. I know this is possible (EVERYTHING seems possible with Houdini) but is there an easy way to recreate this type of interaction?

Thanks for any help you might be able to provide.

Hi!

You can use a density representation of your test object as a mask to test o remap some value.
You just have to import from sops that mask field or build the representation directly inside dops.

Hope That helps!

It does help, thank you. I have to say, you Houdini people are the most helpful people I have ever seen in a forum!

You guys and gals also always seem to post example .hips, too.
That helps so much.

Thanks again!