[Sidefx-houdini-list] Flip collision in normal direction only?

Nick Nimble nick at nicknimble.com
Mon Feb 24 07:38:36 EST 2014

Hi Dominik,

How about splitting it into two simulations? You can source the fluid 
from your desired location outside the sphere, when particles collide 
with the sphere you kill them. Then in SOP's you build a new source from 
the particles that die on the current frame, but slightly displaced by 
the normal of the sphere, so they are inside. Then in the second 
simulation you can source from those points and have this fluid collide 
with the inside of the sphere.
The cool thing about this, is that it can work in any situation with any 
piece of enclosed geometry :-)

Nick, be Nimble
-- 2014 the year where things become clearer --
+31 622 4243 94 | www.nicknimble.com | www.facebook.com/nicknimble

On 24/02/14 13:30, Dominik wrote:
> Hey list,
> Is it possible to make flip collide but only from the normal direction. Let me explain. Ie: I want to pour liquid from the outside of a sphere, but when the liquid enter the sphere, I want it to start colliding with the sphere interior.
> I'm thinking about giving a group to particles inside the collision object and use this group in my static object. But I'm not sure it will work because the collision is apply to the flip object and not per particle. I will try some ideas today, but if you think to a solution, let me know.
> Thanks
> Doum
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