[LSC] File Format Restrictions for Official Parts

[Travis Cobbs]

I meant to reply as well, and then forgot.  The problem with both -det and
-dist in L3P is that neither of those corresponds to an angle (at least
based on my understanding).  I believe that they're both influenced by the
size of the polygons involved.  If one of them does use normalized triangle
surface normals (meaning that they aren't based on the triangle size), then
.1 would probably mean about 26 degrees, and .01 would probably mean about 8
degrees.

--Travis

On Nov 26, 2007 10:37 AM, Michael Heidemann <mikeheide at web.de> wrote:


> I got no reply on this. Do my postings reach you?

>

> cu

> mikeheide

>

> Michael Heidemann schrieb:

> > Can somebody inform me about the angle according our new calculation

> > based on the old -det and -dist rules?

> >

> > I think we have had a good agreement over the past with the two values

> > of -det 0.01 and -dist 0.1.

> > If we had a line that just fulfill this values, what will be the angle

> > with our new calculation?

> > It should be a quad that is about 50 to 100 LDU square I think.

> >

> > I mention this, because I want to avoid that we are too restrictive

> > with our new rules.

> >

> > cu

> > mikeheide

> >

> > William Howard schrieb:

> >> I think what is interesting here is not the % of bad parts (which

> >> doesn't vary that much) but the huge jump in warped quads between 1

> >> and 2 degrees

> >>

> >> ----- Original Message ----- From: "Philo" <philohome at free.fr>

> >> To: "LDraw Standards Committee" <lsc at ldraw.org>

> >> Sent: Friday, November 23, 2007 8:13 AM

> >> Subject: Re: [LSC] File Format Restrictions for Official Parts

> >>

> >>

> >>> I modified Philo program to do this.  Attached is the output for 1,

> >>> 2, and 3

> >>>

> >> Well done, Orion!

> >> Could you send me the modified program?

> >>

> >> So to sum up0: over 3018 official parts,

> >> at 3° we get 91 files in error with 1241 warped quads (3%)

> >> at 2° we get 112 files in error with 1836 warped quads (3.7%)

> >> at 1° we get 144 files in error with 5002 warped quads (4.7%)

> >>

> >> Before deciding the threshold, it would be interesting to check

> subparts

> >> that often contains the guts of the most complex parts, and primitives

> -

> >> 48/primitives, perhaps with a more stringent criteria.

> >>

> >>

> >> Philo

> >>

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> >>

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