[LSC] File Format Restrictions for Official Parts

[Michael Heidemann]

Attached please find a Dat file that I have used for some testing in LDDP.
The results are very curious.
As I am not familar with the new tool from Philo, maybe somebody can 
make some tests with this file.

cu
mikeheide

Travis Cobbs schrieb:

> 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 

> <mailto: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

>     <mailto:philohome at free.fr>>

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

>     <mailto: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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