While experimenting with the conversion.sh script, I noticed that
several reported failures are for regions that have an empty tree, or
regions that, when the Boolean operations are evaluated, have nothing
left. When these combinations are passed to the facetize command, the
db_walk_tree correctly returns a null tree, but the facetize command
presumes that a null tree is a failure. I would propose changing the
facetize command to produce an empty BOT (or an empty NMG if the "-n"
option was provided) in these cases. Perhaps a warning should be
displayed that an empty object is being created.
Does this sound reasonable?
-John
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