topic Re: Implementation of polygon properties has changed in Fusion Electronics Forum

Implementation of polygon properties has changed

matthewM5M9D — Mon, 22 Sep 2025 15:30:15 GMT

I saved a new copy of my design and made some changes. However, some polygons have changed in an area of the board I haven't touched. I made no changes to any polygon properties.

see pic areas highlighted in blue

ORIGINAL POLYGONS in previous design

NEW POLYGONS in updated design

Why are the polygons no longer connecting? Their properties are identical in previous and new versions.

Re: Implementation of polygon properties has changed

jorge_garcia — Mon, 22 Sep 2025 17:52:58 GMT

Hi @matthewM5M9D ,

I hope you're doing well. Did you make any changes to your rules? It's really difficult to establish that the design hasn't changed enough for this to happen. Rules changes like copper clearance changes could cause thermals not to fill.

Review your design rules and see if that could explain the change in the thermal fill.

Best Regards,

Re: Implementation of polygon properties has changed

matthewM5M9D — Tue, 23 Sep 2025 08:25:18 GMT

The properties of the 2, top copper polygons (GND & V_CMD) are unchanged. No design rules changes were made.

Properties of previous, OK polygons

Properties of new, NOT OK polygons

As you can see above, the polygon properties are the same for respective polygons in previous and new copy of design.

Design Rules

OK Polygons, previous design

NOT OK Polygons, new copy of design

The design rules are identical. There are no custom rules.

Just to reiterate, I saved a copy of an existing design and changed components in a different area of the board. I made no changes to Design Rules or the properties of these 2 polygons (V_CMD, GND [both top copper polys]). I only became aware of an issue when I checked design rules.

The only polygon I changed was a GND poly on the bottom layer. I reduced the isolation property to ensure the ground pins of an IC connected to the poly (I posted about that here, https://forums.autodesk.com/t5/fusion-electronics-forum/only-some-gnd-pins-connect-to-gnd-polygon/td-p/13820248

I'm missing something, probably obvious!

Re: Implementation of polygon properties has changed

jorge_garcia — Wed, 24 Sep 2025 19:26:35 GMT

Hello @matthewM5M9D ,

I hope you're doing well. Would you be willing to share the files for review? That way we can get to the bottom of this.

I'll DM you my email.

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

Best Regards,

Re: Implementation of polygon properties has changed

jorge_garcia — Wed, 01 Oct 2025 21:28:52 GMT

Hi @matthewM5M9D ,

I hope you're doing well. I have opened your files in my install of the latest release of Fusion without modifying the files at all and the polygons are back to looking OK.

Re: Implementation of polygon properties has changed

matthewM5M9D — Thu, 02 Oct 2025 13:00:32 GMT

Your image shows the issue 3 board. The problem appears on the issue 4 board.

On the issue 4 board there are 2 polygons (GND & V_CMD) which no longer make contact with 2 pins (as shown in earlier images). For the issue 4 board I instead have routed 2 wires to make the connections.

Re: Implementation of polygon properties has changed

jorge_garcia — Thu, 02 Oct 2025 19:22:40 GMT

Hi @matthewM5M9D ,

I hope you're doing well. So if you unfill and refill 3, you'll see that the polygon recalculates to not have the thermals. I know for this release we had to fix a major thermal bug and this seems to have the unintented consequence you are seeing on these boards. I'll create a ticket for this and share it with the developers.

Best Regards,

Re: Implementation of polygon properties has changed

matthewM5M9D — Fri, 03 Oct 2025 08:18:11 GMT

Ok thank you. Yes when I hide then show polygons in Iss 3, the thermals disappear and do not return, as you say.