Moving Points Along VDB Velocity Grid

Hey Guys, I was trying to follow along CG Matters Tutorial here and for my Test Simulation it worked perfectly.

https://www.youtube.com/watch?v=rJNA5aZsAY8

But when it came to my actual Sim the movement became very strange, like they were only moving along the velocity vectors “outside of the density field” if that makes sense? its a little hard to understand what i mean but it looks like this:
(The grey is the volume on which the points should actually move)

Animation05

It seems like some of the velocity is affecting the Points but more like the secondary advection that is happening through the initial sim.

For Sizing reasons i’ve only packed the first 10 frames of the Sim into the Blend file.(still 80mb sry :smiling_face_with_tear: ) The wrong behaviour is kinda hard to see in them. If someone does want to see it in full i will put the frames besides the blend file to link to

And here the whole Node Setup if just want to have a look:

It all starts just from a grid of points that i spawn every frame and the points should just follow the vectors. My test Sim and this one came both from embergen and used the same export settings. If anyone has an idea or experienced something similar i would love to know :slight_smile:

For the Person struggeling with this in the future:

I used an advection offset to push the Sim in one direction in Embergen and this apparently was the reason for that behaviour