Hallo,
I'd like to discuss a technical matter about the RS274X format and I hope sending a message to this mailing list is a good way to do so. If now, please let me know or forward the message to somebody involved in that topic.
I am the author of KLayout which is an open source IC layout viewer and editor but also offers a Gerber import feature. Stefan Thiede is challenging me from time to time with test cases and since this is the second time this one popped up, I'd like to discuss the matter of interpretation of that particular test case (please see the file attached).
I am referring to the moire pattern in the right column (the bottom pattern). gerbv shows two concentric circles with the inner one having roughly half the diameter than the outer one. When I look at the definition of that moire pattern here
%AMMOIRE* 6,0,0,1.0,0.1,0.4,2,0.01,1,40* %my interpretation differs from that. The RS274X spec I have says this is a moire pattern with two circles, the outer having a diameter of 1.0, the thickness of the circles being 0.1 and the gap between the circles being 0.4.
Since the width and the gap reduces the radius, not the diameter, the inner circle should have a outside radius of
0.5 /*radius outer circle*/ - 0.1 /*width of outer circle*/ - 0.4 /*gap*/ = 0!
So I'd say the inner circle should basically disappear. I have checked against an online viewer (http://www.gerber-viewer.com) which also shows just the outer circle.
To me that looks like a gerbv bug, but I am not an expert on the interpretation of the RS274X format.
Any ideas? Best regards, Matthias
am-test.gbx
Description: Binary data
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