Cadence Allegro DXF Import

randy_rosales

Hi, 

I am running into a problem when importing a DXF which was exported from Cadence Allegro 17.2. The problem is that objects composed of arcs (LWPOLYLINE objects I believe) such as curved copper pours and trace etches are importing in as coarse line segments which approximate the arc. Fully circular objects, like vias, drills, circular BGA pads, import correctly, as do line segment based shapes. 

I have imported the same DXF into eDrawings 2017 and the curved copper pours resolve correctly. So I do not believe I am doing anything wrong with the DXF export options from Allegro. 

Is there something I can do from the Allegro DXF export options that might help. Is this a known limitation in OnShape? 

See below example pictures for each case.

Thank you, 
Randy

Original ECAD curved shape example



Imported DXF in OnShape



Imported DXF in eDrawings

brucebartlett

Have you tried importing into an Onshape sketch, I think you'll find the come in OK. It's just the approximation of the curves for viewing.

If you could do an ltscale command like in AutoCAD it would come good.  

mbattistello

Randy, it looks like you are working on loading ECAD files into Onshape. You may want to check out the IDF importer app in the AppStore -  https://appstore.onshape.com/apps/ECAD/X62PLAGF6A56RBFVEJF6JSM4O2CEN5X4EUECEIQ=/description. You can export IDF files from Allegro and then this app will let you import the board and library files and then generate the board and map in an existing library of components. There is a free plan for 30 days that you can try out.

I know this wont directly address the issue you raised as the IDF files dont include things like the copper pours but if your ultimate goal is to get your board into Onshape it might do some of the heavy lifting. 

-Marc