Why are seams of version 2.4.0 much much better?

[ramosglauco]

Description of the bug

Hello. Since version 2.4.0 the seam pattern has been changed to look for smoother lines. However, this pattern fails on two main points in my opinion:
1 - When trying to follow an aligned path on models with curved surfaces (IMAGE1).
2 - When trying to hide the seams in the sharpest corner of models with more complex geometries (IMAGE2).

I work with the manufacture and sale of decorative objects, where the aesthetic part is very very important. For this reason I'm still stuck on version 2.4.0 and unfortunately I end up not being able to enjoy the new features of the newest versions. I would like to know if there is any idea of ​​reworking the seam algorithm. Thanks.

IMAGE1 - PRUSASLICER 2.4.0 x 2.6.0

IMAGE2 - PRUSASLICER 2.4.0 x 2.6.0

Project file & How to reproduce

seamexemple.zip

Checklist of files included above

• Project file
• Screenshot

Version of PrusaSlicer

PrusaSlicer 2.6.0

Operating system

Win11

Printer model

FLSun SR

[stefan-am]

I also agree that the seam placement in versions later than 2.4.0 often does not work according to what the user wants to achieve :-(

Below is a simplified example of a handle, where i want to place the seam - for the reason of symmetry - in the middle of the rear face.
This was easy in Slicer 2.4.0, set seam to "Rear" and the seam came out in a exact vertical line in the middle of the rear face:

The behaviour changed to the result shown here with 2.6.1RC1:

I want to be able to achieve the former behaviour of version 2.4.0 for the reason of a symmetrical look.
Here the project file:
seam_rear_version_240.zip

[ramosglauco]

There are so many new features, but they forget to fix the basics.

[nvtkaszpir]

Also looks like some seams are getting shifted, so seam is no longer a straight line but is is moved with specific layers in one direction - rounding errors?

Below video is from 2.6.1 under Windows 10, model https://www.printables.com/model/578961-gridfinity-1x1-lego-4x4/files

Desktop.2023-09-23.20-01-53.mp4

[ramosglauco]

They've known the seams are shit for a long long time. But they are worried about other useless things.

[Jan-Soustruznik]

closed as duplicate of #8443