Subject:
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Re: Hidden surface removal, and vertex order in part/primitive DAT files
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Newsgroups:
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lugnet.cad.dev
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Date:
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Fri, 15 Oct 1999 21:00:07 GMT
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Viewed:
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702 times
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Steve Bliss wrote:
>
> [snip]
> Do you want suggestions of difficult bricks to test against?
>
> 2560 (Boat Base 8 x 16) is pretty ugly. It's a big file, there are lots of
> nooks and crannies, and I had to cut apart various primitives to make it
> all go. If you test on this brick, I can also send you the final set of
> files, un-inlined.
Ok, I can announce that my code actually orient ~10000 faces of 2560,
BUT 4.
In a previous version, 40 faces remain unoriented. After I checked all
distances between the ~12000 of the part, I have discovered that some
distances were very small (less than .1 ldraw units). Thus, I have added
a tolerance option that allow the user the choose the minimum distance
between points. If the distance between 2 points is less than the
tolerance, points are considered the same.
I plan to study the distance distribution in all parts to check for
rounding problems. Then I will have to check other parts. I started with
some technic bricks. 3700 and 3601 are ok, but 3703 need a tolerance of
0.01 (rounding problems again!).
I really think my code can do a pretty good job in automatically
orienting faces!
> Steve
bye
jp
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