All,
Something I've been working on which may be interesting/useful.
The primary routine is BlockWipeouts v1.lsp. The ObjMatrix and TraceObject functions must be loaded for it to work. The function TraceJoin is optional.
There's an example file included, which I hope demonstrates how it works and what the options are.
See the header comments in the other .lsp files for details about what they do.
This is intended for 2004 or later where wipeouts are native objects. The example file is 2004 format.
Thanks to Gile for the MakeWipeout function and others as noted.
Suggestions for improvements welcome.