Hey everyone!

I’m still pretty new to Houdini and currently learning by recreating older tutorials.
I followed a tutorial from Houdini 17 exactly, step by step — it’s a simple particle collision setup with POPs and a Static Object.

The problem is: in Houdini 20, the particles don’t collide anymore, even though I built the network exactly like in the tutorial.

Has something changed between Houdini 17 and 20 regarding particle collisions or static objects?
Do I need to activate specific settings now that weren’t necessary back then?

Any help would be super appreciated 🙏

Your second scene is different, the inputs of the merge node are in the inversed order. By default, in DOP networks, inputs of merge nodes affect other inputs to their right. Try switching the order of inputs, or change the Merge node's Affector Relationship parameter to Mutual.