How does "Fillet" command work for closed polylines ?

[Kh.mbkh]

I just noticed that (command "Fillet" "Polyline" "Raduis" ) worked differently for two cases (both closed polylines, exactly two rectangles). The common point for the two rectangles is that the radius chosen to Fillet was 0.75*SmallerEdge of rectangle :

For the second case, the result was not as expected (if we reason by analogy with the first case):

[cadffm · Accepted solution]

This "Rectangle" have 5 vertex (the first and the last at the same place at the upper right corner and clockwise ,

or lower left corner and anti-clockwise.

If I am right, read this - otherwise share your drawing.

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Create a well designed rectangle with only 4 vertex (and property closed=Yes)

or change the direction to anticlockwise and you get your expected result.

What happens in your case:

ACAD fillet the segment1 (the one from vertex  1 to 2), with the segment2 (the one from vertex  2 to 3)  ,

it can't fillet the segment2 with segment3 (segment 2 is to short now),

it can filet the segment 3 with segment4,

(and can't fillet segment 4 with segment5 because segment5 is 0long)

Pls: Next time share your CAD data, not everyone knows everything by heart, but with your CAD data you can quickly see that.

[cadffm]

That's the real/good solution and way to fix, all other are just explainations

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@cadffm  wrote:

Create a well designed rectangle with only 4 vertex (and property closed=Yes)

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[Kh.mbkh]

Thank you very much!
The issue was about 1st vertex place (so the length of 1sf segment), but not about 4 or 5 vertex (I got the expected shape even having 5 vertex). only the location of the first vertex affects the shape:
- Case1: segment1=Vertex1-Vertex2 is the "short" edge; So got expected shape.
- Case2: segment1=Vertex1-Vertex2 is NOT the "short" edge; So got other shape.

Thanks !

[cadffm]

🙂

Without your DWG, I had to guess - and missed your case.

But I put you on the right path, I'm glad.