Thanks to structure for the 'user in control' variant. I'm trying for hands-off automation for a specific use-case (in which the user will load only one prop). But your clear example could certainly be useful in the future, and for others too. I did look for an example of a simple 'user selects one object from list' script, but failed to find one even in Phil C's bundle.

Thanks adp001 for the tip and code on the initial geometry testing. That looks very useful to know about, especially as I have a basic working 'one-click to clear away all items that could clutter or mar a Preview render' script. I may add your check into that when I go back to that script at some point.

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