kicad-developers team mailing list archive

[jp charras <jp.charras@xxxxxxxxxx>]

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.

-- 
Jean-Pierre CHARRAS