I think the testing period could be considered finished: no errors (and no enhancements ideas).
I asked my three very kind co-testers and they agreed.
So here the filter at its final stage:
Attachment:
here only one example.
Attachment:
2021-03-22 11-30-071b2954309ffdf341df3f49b9fcfceac9-dcj4c3z with a particles effect using Map Object (Sphere).jpeg [ 626.65 KiB | Viewed 2041 times ]
Other outcomes from all those who like to use it can be posted in the corresponding thread used during the test period
viewtopic.php?f=11&t=19238.
But, if you find errors or like to suggest enhancements, you may post them here.
Many thanks to Issabella, Mackenzieh and Pat for their support in the testing phase.