Just slightly off-topic
Speaking of guide-paths for extruding objects, every now and then it would be convenient doing it in parts (as for my fake arc-contrived spiral) and then assembling and merging the paths together before extruding. But AC3D seems not to like it: either a single monolithic path or nothing.
Is there a way to get a single path out of a set of sub-paths?
And, more generally: is there a way to melt permanently a set of several objects into a single one? Apparently merging them won't do: although you may not split them back anymore, AC3D seems to remember even too well that they haven't been born as a single entity.
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