Jump to content

My deforming VDB is behaving weird

Recommended Posts

Hi there,

As you can see on the video attached, my VDB is jumping from being fine to suddenly being almost gone, and then appearing again.
What could be happening? The geometry that has been turned into a VDB has a fixed number of points. It was a curve fed into a revolveSOP, curve has been resampled to a fixed number and then that curve is scaled. Thats why the  number of points is not changing.

I am mentioning this because maybe it matters, but it probably doesn't. I don't know!

If anyone knows how to fix this, that would be awesome!!!


2021-07-08 17-06-31.mkv2021-07-08 17-06-31.mkv

Share this post

Link to post
Share on other sites

Oh thank you very much, I will look at this as soon as I can!

Share this post

Link to post
Share on other sites

thanks again for this @ibamobt. your 2nd method produces an interesting result but the VDB is made out of particles, so it gets full of holes as it grows! But it looks rad!
In your first method, you polyfill the shape, so it's closed, and it works.
I forgot to mention that instead of having a closed shape, I want to thicken it so it stays open at the top, but the VDB would work because it is extruded/thickened. 

I am trying to fill this shape with liquid as it grows.


But I am encountering a problem at a certain frame. It stops filling and gets extremely slow. I think this is because the VDB is starting as a closed and hollow shape with the liquid generated inside, then it opens up at the top, and it starts getting weird. 
I have no idea how to fix this, perhaps I should invert the VDB sign at this specific frame, I don't know, it is a bit beyond me.

I also have to thicken as hell my VDB collision geometry, and it doesn't match my initial geo anymore, that sucks, and couldn't find another way around this!

If you have some knowledge in flip sim or anyone else can help, that would be awesome.

I have attached the hip file 




Edited by anbt

Share this post

Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now