Expanded polygons

[pbengtsson]

Hi,

I have some parts in my library.io libraries that have tiny filled polygons in the tPlace layer. This has always rendered perfectly fine in Eagle but If I use the same parts in Fusion 360, the polygons expand quite a bit.

Screenshot from Eagle:

Screenshot from Fusion:

I don't know if it's the edge width or something else that behaves differently. The edge width property is not visible in the inspector in Fusion 360 at all. If I select a line it doesn't look any wider than it does in Eagle but it seems to be in the wrong place.

This is not a big problem for larger polygons but if you try to do silkscreen graphics with fine details, this ruins it completely.

I'd like to remember that Fusion 360 didn't have this problem initially but I'm not sure. It's been a problem for quite some time now anyway. Just haven't had the time to investigate why my silkscreen graphics look so bad.

I have to export my boards to Eagle and insert any silkscreen graphics from there and then generate gerbers from Eagle but I'd like to avoid using different applications for different tasks.

Is there anything that can be done about this behavior?

Per

[jorge_garcia]

Hi @pbengtsson ,

I hope you're doing well. The polygon implementation in Fusion360 has been changed and by default will avoid using a 0 width. Select the polygons in the library and make sure they are still set to a 0 width. That might solve your problem.

Let me know if there's anything else I can do for you.

Best Regards,

[pbengtsson]

Hi,

Thanks and for your reply and sorry for not responding earlier.

I was experimenting a bit with this before posting my original post but couldn't find a way to change the edge width. As I wrote, there is no width attribute visible in Fusion for polygon edges so I'm not sure what width property you are referring to.

I tried running the command "change width 0" on single polygon edges and on different polygon selections using "change group" but neither made any difference. Tried it again now and the results are still the same.

If I'm doing it wrong, please help me understand how to change the width that you are talking about.

By now, I have recreated all my graphics from within Fusion so I can at least use graphics in Fusion now. The downside is that my boards created in Fusion don't display correctly in Eagle anymore.

This was a problem when I couldn't get the excellon drill files working in Fusion's CAM export due to some bug and it probably will be a problem again in the future when I'm once again recommended to use Eagle due to some new CAM bug in Fusion.

It would be nice if I could create PCB graphics that's compatible with both applications.

[jorge_garcia]

Hi @pbengtsson ,

I hope you're doing well. Would you be willing to share the file for review? If you want just copy the part to it's own library. Having a look would allow me to really get a good look and figure out what's going on.

Let me know if there's anything else I can do for you.

Best Regards,

[pbengtsson]

Hi @jorge_garcia 

Sure thing, I copied one of my footprints in Eagle to a new library (attached).

It's similar to the examples above and looks right in Eagle but I can't get it to look right in Fusion unless I recreate it from scratch in Fusion.

[jorge_garcia]

Hi @pbengtsson ,

Thank you for sending the file. I have contacted our developers on this, I'll get back to you  with what they say

Let me know if there's anything else I can do for you.

Best Regards,

[jorge_garcia]

Hi @pbengtsson,

I hope you're doing well. After talking to the developers, we came up with a workaround.

The polygon swells in Fusion because the polygon implementation is different compared to EAGLE. Basically in Fusion, polys don't have a width parameter for the raster fill. So when you import an EAGLE poly, Fusion looks at the width used in the poly and adjusts(read swells) the polygon so that it occupies the same space as in EAGLE. In your case you have zero width polys to make the logo so these have to be dealt as a special case. They are basically given a default minimum width and then adjusted from that. It's due to that minimum width that the poly swells.

Here's the workaround. 

1) In EAGLE, open the library that contains the logo. Go File > Export > Script. This will export the library as a script which you can run in Fusion to recreate the library from scratch.

2) Since you likely only want to create the logo, open the script file in a text editor and copy the portion of the script that creates the footprint.

3) In Fusion 360, open the library you want to have the image imported into. In the CLI paste the portion you copied from the text editor.

I've attached the script I made of this part. Run it in your Fusion 360 library and it will create the logo exactly as it was in EAGLE.

It's not the ideal but I think it's a lot better than drawing it from scratch.

Best Regards,