Hi guys!
I'm new to houdini and just learning it.
I'm trying to create a simple sim with fire spreading on the cylinder.
My problem is that I'm getting these weird lines, when I do actual sim inside POP.
When I use "rastrize volume attribtutes" on the SOP level, all the volumes look fine and don't have any lines or artifacts.
Please help :S

Basically I figured it out. I had a collision object inside a DOP net, as a volume source with density -1. And I plugged it into a Force input in the pyro solver. Basically you need to use a merge node and plug it into the source input, then these lines will go away.