Pop Advect By Volume Problems

[GlennimusPrime]

With Pop Advect By Volume inside a POPnet, when particles reach the edge of the volume / the volume bounds, they lose all velocity and just stop.


I recall seeing a video somewhere of someone who builds a better Pop Advect By Volume node, by diving inside and setting the particle velocity to continue, rather than just hitting zero.
Does anyone know the video I'm talking about? I cannot find it anywhere.

Or does anyone have any ideas on how to implement this technique?

[tamagochy]

You can detect by volume sample is particles inside volume and advect them

[GlennimusPrime]

Unfortunately vops knowledge is fairly limited. I somewhat understand the process but would get definitely get stuck.

Would that entail first comparing whether the particle is inside or outside of the volume, then working out the vector the particle was last using while still inside the volume and lastly transferring that vector to the velocity of the particle if it were no longer inside the volume?

[GeneralLethal]

You can store the velocity pre-advection in a different attribute each frame, and copy it back to v post-advection if the volume sample turns out negative.