[LSC] File Format Restrictions for Official Parts

[Travis Cobbs]

Here are my thoughts:

Co-planar tolerance:

I would change the wording on this section as follows:

A quad (line type 4) must be planar, meaning that if it is split into two
triangles, both triangles will be co-planar with each other.  There are
always two ways to split a quad into two triangles, and both ways must
result in co-planar triangles.  The triangles are considered co-planar if
the angle between their surface normals is less than or equal to 1 degree.

Under the BFC section, BFC CERTIFY and BFC NOCERTIFY are missing.  I believe
that 0 BFC CERTIFY is still the recommended way to indicate that a file is
BFC-certified.  We can discuss BFC NOCERTIFY if people think it doesn't
belong in official parts.

Also, I personally would skip the compound BFC commands.  Just list all the
possible first words after BFC.  The BFC spec allows some BFC commands to be
joined with others, but they are also all valid independent of the others.
You just come up with a much bigger list when you try to list all the valid
combinations.  However, if people feel that it's better to list all the
compound combinations, we do need to be extra sure that we haven't forgotten
any.

--Travis

On Nov 19, 2007 11:22 AM, William Howard <
william at howard-family.fsworld.co.uk> wrote:


> Another version uploaded to the scratch pad.

>

> Still a work in progress, so feel free to rip it to bits

>

> W

>

> ----- Original Message -----

> From: "William Howard" <william at howard-family.fsworld.co.uk>

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

> Sent: Wednesday, November 14, 2007 10:49 AM

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

>

>

> > Rats!  Look like I just "volunteered" to draft it.

> >

> > Suggestion.  We do a "work in progress" version that just covers

> > restrictions on the file format spec for official parts, publish and

> adopt

> > that (which gets the immediate requirment to publish the information

> taken

> > out of the file format spec out of the way) and then do the full

> version.

> >

> > W

> >

> > ----- Original Message -----

> > From: "Philo" <philohome at free.fr>

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

> > Sent: Wednesday, November 14, 2007 10:36 AM

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

> >

> >

> >>I vote for it!

> >>

> >> Philo

> >>

> >> William Howard wrote:

> >>

> >>> Why not do both?  If the "Official Parts Format Specification" started

> >>> with the LDraw File Format Spec as its "base", lists restrictions on

> it

> >>> and then covers additional requirements for Official Parts we can have

> >>> our cake and eat it!

> >>>

> >>> W

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

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

> >>> Sent: Wednesday, November 14, 2007 10:19 AM

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

> >>>

> >>>

> >>>> Agreed! But then we are not writing a "File Format Restrictions for

> >>>> Official Parts" but an "Official Parts Format Specifications" - which

> >>>> would be quite useful !!!

> >>>>

> >>>> Philo

> >>>>

> >>>> William Howard wrote:

> >>>>

> >>>>> Which also raises two of the "tribal knowledge" items that needs

> >>>>> covering in the document

> >>>>>

> >>>>> 1) precision (is it 3dp for parts/primitives and 4 dp for hi-res

> >>>>> primitives)

> >>>>> 2) trailing 0s on numbers (1.5 or 1.500)

> >>>>>

> >>>> _______________________________________________

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> >>>>

> >>>

> >>>

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> >>>

> >>

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