kicad-developers team mailing list archive

[Wayne Stambaugh <stambaughw@xxxxxxxxxxx>]

On 12/18/2013 1:29 PM, jp charras wrote:
> Le 18/12/2013 06:02, Cirilo Bernardo a écrit :
>> These bugs are identical and concern the 3D viewer (rectangular
>> outline used because adjacent segments fail the exact endpoint
>> test).
>>
>> The line causing this is in specctra_export.cpp, line 1011:
>>
>> prox = Mils2iu( 0 );
>>
>>
>> I did not submit a patch because I believe some discussion is
>> necessary about the limit imposed for the closeness of points and the
>> routine (fillBOUNDARY) is also used by the specctra exporter.  In bug
>> 1236583 the user has points which differ by 500nm.  In bug 1261583
>> the difference in the DXF file is less than 10nm.
>>
>> Is it possible to change the limit without adversely affecting the
>> specctra export, and if so, what limit would people consider
>> reasonable? From my point of view, the worst case which isn't in the
>> domain of the plain ridiculous would be that someone uses a 32-bit
>> float representation of a board which is about 1000mm across - that
>> would give a worst case expectation of about 1 micron. I would
>> imagine even 10 microns should be acceptable given modern
>> manufacturing techniques and limitations of reality.
>>
>> - Cirilo
> 
> You can try:
> prox = Mils2iu( 1 );
> 
> One mil is certainly acceptable, and should be enough for rounding
> issues when arcs are converted from dxf files.
> 

This may solve the 3D drawing issue but is it acceptable to export to
specctra with an unclosed board outline?  I seem to remember there being
some debate as to whether or not that is valid.  The other option is
attempt to close any gaps in the board outline only for 3D rendering
purposes and enforce a closed board outline for specctra export.