kicad-developers team mailing list archive

[jp charras <jp.charras@xxxxxxxxxx>]

Le 04/12/2013 16:40, Wayne Stambaugh a écrit :
> On 12/4/2013 10:23 AM, Lorenzo Marcantonio wrote:
>> On Wed, Dec 04, 2013 at 09:24:15AM -0500, Wayne Stambaugh wrote:
>>> What is missing from the board file format that is required to export to
>>> IDFv3?  None the the other exporters required any changes to the board
>>> file format.  I'm not thrilled about the idea of changing the board file
>>> format just to satisfy exporting to another file format.
>>
>> I already did some feasibility study a while ago, nothing is needed
>> (except some way to convey height information for the modules, if
>> wanted). Also if he picks the segment in the board instead of taking the
>> bounding box he will a) handle the more-common-than-you-think case of
>> nonrectangular boards and b) not need the 0.1mm reduction hack.
> 
> I didn't think any changes were required but I'm no IDFv3 expert.  I
> would prefer to see the actual board outline implemented before
> committing this feature to KiCad.  More than 50% of the boards that I
> design are *not* rectangular so this would be a show stopper for me.

Extracting actual board outlines is now very easy.
see void EDA_3D_CANVAS::BuildBoard3DView() which uses them to show the
3D view of the epoxy.

The requirement is (obvioulsy): a closed valid polygon exists.

But a valid polygon (needed for 3D viewer and specctra export) can be
created only if a full board outline exists and was created using the
same grid for all lines or arcs.
Therefore a footprint which includes a partial board outline (i.e.
having edges cutout) will certainly break this requirement.
This is the reason why edge cut outlines are not allowed in footprints.

> 
>>
>> Every structure in the IDF3 is defined by wound polylines (board
>> counterclockwise, cutouts clockwise), each segment can be a line or
>> a circular arc segment. So nothing in pcbnew can't be represented in
>> IDF3 (some math required:D)
>>
>> A better work could be done for holes, since IDF distinguish between
>> mechanical, tooling, via and pins... since an NPTH hole is definitely
>> a mounting hole, the only doubt is the plated hole (can be a pin or
>> a 'grounded' mounted). Heuristics could help, maybe. Or maybe simply
>> nobody cares about the difference (like for some things in gencad).
> 
> Perhaps looking at the net connections could be used determine the
> heuristics.  If it cannot be determined, prompt the user to state the
> heuristics.
> 
> 
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-- 
Jean-Pierre CHARRAS