the question…..
Hey Girls ans Guys..
I am making a gas sim that sucks dust into a vortex and down a magical
hole. I have made a volume of vectors in sops that behaves its self
and sucks particles into the hole in an elegant way. When i use a gas
field vop that samples the sop vector field and adds it to the the
velocity it looks cool, the dust/ smoke just swerls around the centre
without crunching in as i need it to. I believe the divergence is
keeping the gas from compressing or even exiting the sim.
If the answer is to change divergence, I have not tyred to mess with
divergence yet so i would appreciate pointers on how to tackle that.
any ideas would be appreciateed.
the answer ….
I've been doing some of this recently. You are correct about compression.
Houdini won't let its density fields become compressed. Use Negative
Divergence to counter act this. Basically, create a ball of negative value
where you want the smoke to suck into and name it divergence. You can play
with the value of the ball to create faster and slower speeds.
…
Add a scalar feild called divergence, there already is one
call it extraDiv or something, now extraDiv exists and in the gasfieldvop i import divergence and add extraDiv to divergence, then export the new divergence.
and the File
Here is a file I made with a Little advice from Jacob Clark of gas being sucked with divergence.
