Subject:
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Re: BFC revisited
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Newsgroups:
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lugnet.cad.dev
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Date:
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Fri, 17 Aug 2001 17:45:22 GMT
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Viewed:
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492 times
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In lugnet.cad.dev, Paul Easter writes:
> I have printed the bfcspec file for review. Hopefully I will get a response
> back to you.
Cool!
> I have been using BFC in most all my new parts for the last six months or so.
> Please send me the BFC compliant primitives, so that I can be sure I am
> using them correctly.
will do.
> Correct me if I am wrong. We cannot make the sloping cylinder primitves bfc
> compliant since they can not be made to work on all orientations. (Except
> for making a new set of them and updating all the parts that use them.)
I'm not understanding the problem. I've made versions of the sloping
cylinders that are bfc-compliant.
> Can reverse winding be used to correct this problem?
Do you mean the problem (not just with sloped cylinders) that sometimes
primitives are used for the outside surface, and sometimes for the inside
surface? Like the two 4-4cyli.dats in stud2.dat?
That is a real issue, and fixing it will involve updating the part files,
because one way or another, the part file has to indicate which way it's
using the primitives.
There have been two workable suggestions for dealing with this problem.
They are:
1. Make a second set of primitives, with an inside-out orientation. Using
these files will require all part files to be updated to point to the new
primitives.
2. Use a new metastatement to flag when a primitive is being used 'inside
out'. This approach will require all part files to be updated with these
new metastatements.
The BFC proposal uses approach #2. Technically, there's no clear advantage
to either approach. Maintenance-wise, I think approach #2 is better.
Steve
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Message is in Reply To:
 | | Re: BFC revisited
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| I have printed the bfcspec file for review. Hopefully I will get a response back to you. I have been using BFC in most all my new parts for the last six months or so. Please send me the BFC compliant primitives, so that I can be sure I am using them (...) (23 years ago, 17-Aug-01, to lugnet.cad.dev)
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