Technique :- As I clear out my server I am finding lots of old files that hark back to H8.1 days, which I update for h12. Not my example but a good one for beginners that uses the magnet sop which in turn has an attribute that causes to the cubes to spin.

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how to ? cull geometry outside camera frustum using an expression

$MAPU<-0.2 || $MAPU>1.2 || $MAPV<-0.2 || $MAPV>1.2 || $MAPW<1