Strange behaviour LISP _.fillet with R=0 command (ACAD 2019 & 2022)

[hreuvers]

It seems AutoCAD has different definitions of the Fillet command.

The commandline Fillet gives a different output than the LISP Fillet. See image below and DWG attached.

Does anyone know how I can use/ address the *correct* Fillet definition in LISP?

You can see the difference in the command line:

Select first object or [uNdo/Polyline/Radius/Trim/mUltiple]: <= this definition gives wrong output

Select first object or [Undo/Polyline/Radius/Trim/Multiple]: <= this definition gives correct output

Test routine:

(defun c:f0test () 
  (setvar "cmdecho" 0)
  (setq old_radius (getvar "filletrad"))
  (setvar "filletrad" 0)
  (command "_.fillet" pause pause)
  (setvar "filletrad" old_radius)
  (setvar "cmdecho" 1)
  (princ)
)

[pendean]

Are you trying to tell us something in your DWG file that is not mentioned in the words of your post?

[hreuvers]

Yes, this strange behavior only arises when you have a large area with geometry in modelspace.

Therefore I have added this.

You can also add a "regen" command in the routine to overcome the strange behavior, but this is unwanted when dealing with large DWG's.

[pendean]

FILLET command, not using your lisp, seemed to work fine for me at the far end: but being very far from 0,00 is a known program limitation: if REGEN solved it then why not add that step in your automation if I may ask?

[ВeekeeCZ · Accepted solution]

Add this line to force the lisp to use the current acad's version of fillet.

(defun c:f0test () 
  (setvar "cmdecho" 0)
  (setq old_radius (getvar "filletrad"))
  (setvar "filletrad" 0)
  (initcommandversion)
  (command "_.fillet" pause pause)
  (setvar "filletrad" old_radius)
  (setvar "cmdecho" 1)
  (princ)
)

[hreuvers]

Hi pendian,

Thank you for your reply.

The example image I provided was done very close to the origin.

And yes, the commandline FILLET does the job correctly, anywhere. The LISP FILLET doesn't.

Currently we have included the REGEN in our routine, but it is not ideal.

The REGEN takes quite some time when dealing with large DWG files and lot's of Fillet R=0 operations.

We are using this routine since AutoCAD R14 without problems, I seems only last versions of AutoCAD are having this issue.

[hreuvers]

Thanks Willy, lifesaver!

OMG: FILLET is literally used as an example in the AutoDESK Help about "initcommandversion":
https://help.autodesk.com/view/ACD/2015/ENU/?guid=GUID-6176FC98-DC5D-433E-8D76-F481BE68D46A

[ВeekeeCZ]

You know that you can simply hold Shift while selecting a second line to do the same without a lisp, right?

[hreuvers]

Well, to be honest, I was not aware of this. (emoticon shame)
I think we didn't use it because we have a lot of predefined fillet routines in which F0 is logical:
F0, F1, F2, F3, F4, F5, etc..

[Sea-Haven]

Have a look at this can have any fillet rad just type F1 or F12 or any f+rad value. Also does Circles and offset.