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 CAD / Development / 9391
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Subject: 
Re: primer/tutorial on BFC?
Newsgroups: 
lugnet.cad.dev
Date: 
Sun, 4 Jan 2004 14:36:21 GMT
Viewed: 
1690 times
  
In lugnet.cad.dev, Lars C. Hassing wrote:

When we discussed the BFC business the general assumption was that a negative matrix
would flip the winding of the polygons. This is also true for e.g. 4-4cyli.dat,
but not for the 2D primitives like 4-4disc.dat when just toggling the y-value.
However, I think things do work as expected if you e.g. reference a stud:
1 16 0 0 40 1 0 0 0 1 0 0 0 1 stud.dat
1 16 20 0 40 1 0 0 0 -1 0 0 0 1 stud.dat

Hmmm, very good point.  I don't like treating specific object specially, but I don't
see any way around it.  I played around with the stud and with a 'solid' cylinder
object, I couldn't find a way to get L3Lab's BFC handling to fail.

Steve



Message is in Reply To:
  Re: primer/tutorial on BFC?  [DAT]
 
(...) I think it works just fine. L3Lab correctly detects that the matrix is mirroring, see View/Tree View... and click the BFC radio button, it should say INVERT in front of the line. When we discussed the BFC business the general assumption was (...) (21 years ago, 3-Jan-04, to lugnet.cad.dev)

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