[LSC] File Format Restrictions for Official Parts

[Michael Heidemann]

I just walked through the revised version. Here my remarks:

*Co-planar Tolerance*
Do we have already agreed to the angle value of 1? Or can it be more 
like 2 or 3?

*Duplicate Line Types*
.......SNIP
Every effort must be made to remove overlapping co-planar polygons. 
Where overlapping polygons are unavoidable, the overlap must be kept to 
the absolute minimum. Every effort must be made to remove intersecting 
(non co-planar) polygons. Where intersecting polygons are unavoidable, 
the intersection(s) must be kept to the absolute minimum.

I know that this would result in good parts. But I also know that this 
would be a very, very hard work and result in more huge files, because 
often I can not use primitives anymore. Especially the technic parts 
needs to allow overlapping because it is all round. What we need to 
avoid huge files, but get good files is difficult to explain.

*Colour restrictions
*
Missing: Sub-parts (line type 1) must no use colour 24.

All others are ok for me.

mikeheide

William Howard schrieb:

> Updated again with the latest comments posted here

>

> ----- Original Message ----- From: "William Howard" 

> <william at howard-family.fsworld.co.uk>

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

> Sent: Monday, November 19, 2007 7:22 PM

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

>

>

>> 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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