Creating a vdb with a hole in it and FLIP collisions

[Jmg07]

Hi, 

Is there a simple way to create a volume with a hole in it?

I'm using FLIP and some of the objects I want to collide with have holes in them eg. pipes

But turning the geometry into volumes doesn't always work great and the holes in the geo are covered up by the voxels.

I guess there's no great solution to this - and one other question I had was why voxels just disappear when their size is reduced? With particles you can just keep reducing the size smaller and smaller but voxels seem to have a minimum size below which they just disappear off the screen.

Thanks

[vicvvsh]

On 18.09.2021 at 6:15 AM, Jmg07 said:

Hi, 

Is there a simple way to create a volume with a hole in it?

I'm using FLIP and some of the objects I want to collide with have holes in them eg. pipes

Hi,

in my opinion the simplest way to get vdb with a hole is vdbfrompolygons sop. Just make sure the geo is watertight and walls have depth bigger then 1 voxel's size. I attached a file with examples of how to create VDBs with a hole and use them as collider in flip simulation.

 

vdb_with_hole.hipnc

Edited September 19, 2021 by vicvvsh