Hi,
brlcad has left the following comment at Model a bicycle chain #4
https://www.google-melange.com/gci/task/view/google/gci2014/5340178071683072:
regions within regions
A "region" in BRL-CAD is supposed to indicate a single part, eg, a single
piece of metal. That means each link and pin will likely be separate
regions or you'll have at least one pin and link region that you reuse
multiple times.
Presently, you have regions being unioned into regions, which is considered
a modeling error (you can't put a metal into a metal). This error is warned
if you run "e chain.c" where it notes that you made all of the links
regions, but you also made each of the shapes that comprise a link a region
too. That is the source of the error and is easily fixed by making all of
the s*.r objects either go away (getting replaced by their non-region
version), for example s1.r gets replaced with s1 in link.r .. make sense?
Also, it looks like you have the pins in now, but you missed a hold on the
last pin..
Greetings,
The Google Open Source Programs Team
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