OpenVDB collision fix

[joseba]

Hello, I am playing with the new Lightwave 2019 demo. I am trying to do a sort of liquid simulation inside of a pipe.
I have two objects: The pipe (thickened) and a little disc inside, the water. I use Mesh to volume node in level set mode and world coords in both. THen i connect the water node to a scatter and next to a solver with the pipe object connected as collision grid.
The problem is about the collision. It seems that the pipe collision is inside, not in the ¨skin¨of the pipe.
Any ideas?

[oliverhotz]

thats because you have to remove the inside of the pipe from the vdb.. you have to hollow it out

[joseba]

Thank you very much Oliver.
So, the VDB collision is always a solid and you need a boolean operation.