Atomic Perception

I ran into this, the other day. It is pretty much standard practice to drop down a Normal node, at the end of your modeling network, to resolve any normal flips that may have occurred in the modeling process.

Drop down the Normal node and move the blue Display flag to that node.

Try checking “Output Back” on the polyextrude node. Fluids can't collide with a paper thin face. Fluids and gas require an actual volume to intersect with.

I think you might have to place the Retime inside a loop and fetch the point attributes, one at a time.
use the point function to fetch the attribute you want for each retime field.
NOTE: You don't need the @ symbol when referencing an attribute using this hScript function.