Subject:
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Re: Some Words To BFC
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Newsgroups:
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lugnet.cad.dev
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Date:
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Wed, 5 Apr 2000 14:18:08 GMT
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Reply-To:
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rui.martins@link.SAYNOTOSPAMpt
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Viewed:
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7186 times
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On Wed, 5 Apr 2000, Leonardo Zide wrote:
> John VanZwieten wrote:
> I believe that it's possible to create a program that automatically
> fixes the orientation of a part. Take a look at this picture:
> http://www.geocities.com/l_zide/1/flag.gif
Well, with Netscape I couldn't see the gif, but with IE5 I was able to see it,
but it seams to be damaged, but I was able to get the ideia.
> The red faces are the back faces and the green faces are the front
> faces. The image on the left is the part as it is in the LDraw library,
> and on the right you have the part after it's been processed by my
> program (just a few errors on the sphere at top).
Well this is exactly what I have been researching for a month now ! and believe
me to be able to correct files 100% is almost impossible, due to the way the
files are built.
Which method are you using.
I have researched (Odd/Even), (BSP) and (Winged Edge). There is also the brute
force method of supersampling raycasting, but this one is a NO GO.
See ya
Rui Martins
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Message has 2 Replies:
 | | Re: Some Words To BFC
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| (...) Perhaps this approach is a bit naive, but couldn't you use something similar to a point in polygon test? Cast a ray along the normal from the center of each polygon. If it intersects an odd number of surfaces then the normal points toward the (...) (26 years ago, 5-Apr-00, to lugnet.cad.dev)
| | | Re: Some Words To BFC
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| (...) I agree that an automatic process might not always work 100% but it can make parts almost perfect and with only a small effort you'll be able to completely fix them. (...) I think I'm using what you call odd/even, I cast a ray from the center (...) (26 years ago, 6-Apr-00, to lugnet.cad.dev)
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Message is in Reply To:
| | Re: Some Words To BFC
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| (...) I believe that it's possible to create a program that automatically fixes the orientation of a part. Take a look at this picture: (URL) The red faces are the back faces and the green faces are the front faces. The image on the left is the part (...) (26 years ago, 5-Apr-00, to lugnet.cad.dev)
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