Issue #6234 - Sketch partially vanishes on zoom in

[chrisb]

I have this sketch (originating from a map reverse which caused flipping the arcs):

SnipScreenshot-25c423.png (25.21 KiB) Viewed 1325 times

When I zoom in so that the upper and lower outer lines are outside of 3D view, then the arcs all of a sudden vanish:

SnipScreenshot-4c8fc8.png (22.23 KiB) Viewed 1325 times

I have already restarted FreeCAD. The procedure to reproduce is:
- open the file
- edit Sketch
- zoom in.

OS: macOS 10.16
Word size of FreeCAD: 64-bit
Version: 0.20.25131 (Git)
Build type: Release
Branch: master
Hash: 7c519689f0d5ea78fb3292be36a857d283c05507
Python version: 3.9.5
Qt version: 5.12.9
Coin version: 4.0.0
OCC version: 7.5.2
Locale: C/Default (C)

[chrisb]

It turns out to be even worse, if I use FitAll: The sketch disappears completely from 3D view.

[ragohix769]

I confirm (and complete disappear with fit2all too).

https://ibb.co/5c2R5nj

(I don't know why I cannot paste an image from clipboard in this forum)

OS: Ubuntu 18.04.5 LTS (KDE/plasma)
Word size of FreeCAD: 64-bit
Version: 0.20.
Build type: Release
Branch: unknown
Hash: 471e143d0903b170701d142681d10ab148747d0c
Python version: 3.6.9
Qt version: 5.9.5
Coin version: 4.0.0a
OCC version: 7.5.1
Locale: Italian/Italy (it_IT)

[chrisb]

Thanks for the confirmation. Abdullah, is this a Sketcher issue?

ping

[Shalmeneser]

Sketch : 16-ellipse ??

[GeneFC]

I get an error message in the Report View, "Camera settings failed to read".

However, if I click on the orientation icons at the top of the display I can get the sketch to show up correctly in the sketcher window. (The shape is invisible in the default orientation.)

I have never used Map Reversed in this manner, so I have no idea what is supposed to happen.

OS: Windows 7 Version 6.1 (Build 7601: SP 1)
Word size of FreeCAD: 64-bit
Version: 0.20.25065 (Git)
Build type: Release
Branch: master
Hash: 4de2ad46b2b9c78ac2721a0dbea7c19306261095
Python version: 3.8.6+
Qt version: 5.15.2
Coin version: 4.0.1
OCC version: 7.5.0
Locale: English/United States (en_US)

Gene

[chrisb]

I have never used Map Reversed in this manner, so I have no idea what is supposed to happen.

I always thought it should just flip the sketch 180°. I have used MapReversed before, and never experienced any issues. I'm very sure that it shouldn't cause weird visibility issues.

[abdullah]

Thanks for the confirmation. Abdullah, is this a Sketcher issue?

ping

It is weird. I get it by just moving the view using drag and drop:

Peek 26-06-2021 07-19.gif (283.54 KiB) Viewed 1153 times

There is no redrawing by the sketcher at this point. This is why I think it is Coin/Camera configuration related. It is as if there were an actual camera view that is smaller than the view represented in the 3D view. In such a case Coin could decide not to represent what is outside of the actual camera view thinking that it is not going to be seen anyway. However, this is just an assumption, as I do not have the time to look into it in depth.

It is a bug to be reported, that for sure.

[chrisb]

Thanks for the feedback, I create a bug report later.

[Willem]

When I open this file the report view gives: Camera settings failed to read
This is a perhaps an indication for the strange behavior

My system:
OS: Ubuntu 20.04.2 LTS (ubuntu:GNOME/ubuntu)
Word size of OS: 64-bit
Word size of FreeCAD: 64-bit
Version: 0.19.
Build type: Release
Branch: unknown
Hash: e8566f22bbeb0b7204e3c45519d0963e8881100b
Python version: 3.8.5
Qt version: 5.12.8
Coin version: 4.0.0
OCC version: 7.5.1
Locale: Dutch/Netherlands (nl_NL)