Subject:
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Re: primer/tutorial on BFC?
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Newsgroups:
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lugnet.cad.dev
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Date:
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Sun, 28 Dec 2003 02:33:23 GMT
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Viewed:
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1875 times
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In lugnet.cad.dev, Chris Dee wrote:
[snip]
Thanks for writing this up, Chris!
Your explanation was very good in all respects except for one small point:
> ... although for cylinders it
> is possible to turn them inside out by negating the transformation matrix, and
> adjusting the position).
Actually, negating the transformation matrix should not invert any object; and even
if it does, it's not a valid technique for BFC'ing.
Steve
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Message has 2 Replies:
 | | Re: primer/tutorial on BFC?
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| (...) OK - it's not a technique I use, but in an email conversation recently somebody convinced me that inverting the matrix would switch the winding. Now that I test it again I found I was mistaken. Chris (21 years ago, 28-Dec-03, to lugnet.cad.dev)
| | | Re: primer/tutorial on BFC? [DAT]
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| (...) For the two-dimensional primitives (disc, ndis, ring, chrd) you can do the following: Say you have a disc in the x-z plane, like: 1 16 0 0 0 10 0 0 0 1 0 0 0 10 4-4disc.dat If this has the wrong BFC winding, you can just flip (mirror) the (...) (21 years ago, 30-Dec-03, to lugnet.cad.dev)
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Message is in Reply To:
| | Re: primer/tutorial on BFC?
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| (...) I think ease or difficulty depends on which tools you use to author parts. I use LDAO as the editor with L3Lab for preview and find it reasonably easy. Others may wish to comment with reference to their favourite tools. To BFC an existing DAT (...) (21 years ago, 27-Dec-03, to lugnet.cad.dev)
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