Okay thanks for your example.
So you example works as well. What I found out:
Only when I add $F and the node gets the clock symbol on it, Maya updates the particles.
If I don't have any $F inside of my nodes, they output is not generated. But I think this should be also updated at least when I click “Sync Asset” (although also changing parameters should update it). If you are working in a scene with a timeline range e.g. 500-700 then you never have the chance to get the points updated.
If you remove your $F from your node and make it non-timeable and plugin a parameter from you hda you will see that in maya the points only get updated when you are at frame 1.
When you combine both
in the Force Total Count parameter you will see that points update when changing the timeline in Maya, but if you change the parameter numpoints on the houdini asset in maya, all points get lost and it will output: “No geometry generated”. Going back to frame one and sync the asset and the points show upagain!
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I'm using:
Maya 2018.4.6
Houdini Engine 17.5.293
Best regards,
Georg.