Designer v2.5.7 Isometric grid fit to plane inconsistent result with lines

[MrSimmons]

When using the isometric grid Fit to plane button, sometimes the result comes out skewed with incorrect proportions.

In the attached video, I have two squares. the square on the left is made up of 4 individual straight lines, and the square on the right is made using the rectangle tool.

Ive only observed the bug occur when using line segments and not pre-made shape tools. But due to the intermittent nature of the bug, I cant guarantee that its an isolated issues to just line segments.

The grid settings is the default 1cm isometric cube preset (image of panel also attached)

 

Ive also attached the save file in case that helps

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Whats interesting is this issues seems rather intermittent. For me the bug appears to happen the most consistently when I haven't used the application for a few minutes. But even then it will appear every now and then during a session.

 

EDIT:

- OS macOS 15.1
- MacBook 14", M1 Pro w/ 16GB Ram
- Hardware acceleration is ON
- Unsure if this use to work or not. Today is my first day using the isometric grid

 

cabinet.afdesign

Edited December 26, 2024 by MrSimmons
Additional device info

[GarryP]

In your video, the ‘square’ on the left (multiple Curve layers) had a ‘combined rotation’ of minus 90 degrees before you used Fit To Plane and the square (a Rectangle layer) on the right did not.

The different/combined Rotation/Shear settings for the Curve layers that make up the ‘square’ on the left may be something to do with what you are getting but unfortunately the document you gave us shows only the result of the manipulation, with no History or Snapshots, so we can’t try exactly the same manipulation for ourselves on the original layers to see if we get the same result.

Can you share the document before the isometric manipulation?

[MrSimmons]

Ahhh good spot with the -90 degrees! I'm able to completely re-produce it when the combined rotation is positive 90 degrees or negative 90 degrees. Whats interesting here is the combined rotation seems to be random every time I select the square which would be the reason why I thought it was intermittent.

Here is the attached file.

I recon this is still probably a bug, but potentially not with the fit to plane button. Whats even more interesting is that each of the line segments have the following rotation:
- 0
- -90
- 90
- 180

That would indicate that the combined rotation should be +180 every time, thought I'm guessing that its just picking the rotation of the first object it sees and using that.

cabinet.afdesign

[MrSimmons]

I've run into another oddity with the Fit to plane button. This time the result of two different line segments are completely different.

The rotation of both of the lines are the same, so I'm not sure what could be causing this issue.

 

So I recon there is some kind of bug with that button / the isometric grid.

cabinet.afdesign

[GarryP]

Thanks for sharing the documents and the extra video.

There’s definitely something odd going on there with the latest document/video.

I’ve had a quick look and there’s nothing that I can see that should cause the difference.

The bottom line, after “Fit to Plane”, seems to be ‘realigned’ properly (30 degree rotation – as per the isometric grid – with a decrease in length) but the top line isn’t (23.04 degrees rotation and increase in length).

This needs someone more knowledgeable than me to diagnose properly.

I know there are issues with the corners on Rounded Rectangles so this could be a related issue.

[lepr]

The bug is years old from v1.