Polygons in Altium are tricky.
The solution to your problem is to use the rule InPolygon
instead of IsPolygon
.
As I understand it, Altium treats polygons as kind of a "meta" descriptor, internally. A "Polygon" object contains the polygon outline. The outline itself is matched with the InPolygon
rule (which is what you want).
This is of course made far more obnoxious by the fact that IsPolygon
is a valid rule token, so your rule will seem to be correct, and even pass the rule-checker, but silently fail when you try to actually repour the polygon, since the IsPolygon
rule matches against something else.
Also, from your included image, you are trying to make a Power Plane Clearance
rule affect a polygon. I think you may need to change that to a Clearance
rule (Under the Electrical
grouping in the rules window, since Altium's polygons are not planes.
This is off the top of my head, ATM. It's been a while since I needed varying plane clearances in Altium
Don't ask how long it took me to figure this out myself....
Oh, as an aside, placing polygons over polygons can have interesting effects, since which polygon is held-back due to the rules is dictated by the pour order. Subsequently, if you modify your layout, and run a command like Repour Violating
, your can wind up with your polygons in a odd state, where a subsequent full Repour
will change the overall polygon outline, even though the polygons already were passing the design rules.
When you're setting up a new PCB rule, you can type "query text" to match objects to which the rule should apply.
When I do what you're trying to do, I just use "isVia" as the query text and then set the Connect Style to Direct Connect:
I'm not sure how to exclude your QFN's thermal stitching vias though...
Best Answer
Go to Design -> Rules, look for a Polygon Connect Rule (NOT a Plane connect rule).
In that rule, make sure that "Direct Connect" is selected. Confirm, then leave that dialog. Repour all polygons (T->G->A). Now, check if you can still see those holes.
I have a feeling that these come from a thermal relief connect (which is setup in said rule), overlapped by tracks.