Ported filament shrinkage compensation for XY and independent Z from Prusa Slicer (fixing MMU painting, seam painting, support painting issues)

[igiannakas]

Ported filament shrinkage compensation from Prusa Slicer. Updated Prusa's calculation logic to be 100 = no shrinkage to be consistent with orca definitions and any saved profiles from the users (vs. Prusa that uses a 0 as no scaling).

Can adjust shrinkage compensation on X, Y as well as Z (separately) and is compatible with multi colour/material prints.

Existing user filament compensation settings will migrate to XY shrinkage (as the parameter name is unchanged). Z will be the default of 100%.

Fixes #5756
Fixes #5152
Fixes #4551
Fixes #5664
Fixes #4091

Supersedes PR: #5774

Screenshots/Recordings/Graphs

Tests

The below tests were performed:

1. Single color XY/Z compensation
2. Multi color XYZ compensation
3. Different XYZ compensations per filament - ignores setting and slices at 100%
4. If object is taller in Z than printer space, throw error in the UI
5. If object is wider than the plate or ends up out of bounds, throw error at the end of slicing
6. Seam & support painting work as expected

All of the 6 above did not work in the current implementation (as known).

[Noisyfox]

Nice, and does this also solve the issue that mmu/seam/support painting not working properly when shrinkage != 100%?

[igiannakas]

Have not tested seam & support painting but probably yes, as it simply applies an XYZ scale transform to the whole object instead of just the perimeters, that the old version used to do, from what I understand.

EDIT: Tested below, it works.

[igiannakas]

If anyone fancies a code review as it’s quite a long-ish merge, hence is very well possible I missed something in the merge, the prusa commit for this feature is here: prusa3d/PrusaSlicer@4b8fe98

[igiannakas]

Nice, and does this also solve the issue that mmu/seam/support painting not working properly when shrinkage != 100%?

@Noisyfox

Support painting works

(left - this PR, Right 2.1.1)

Seam placement works
(left - this PR, Right 2.1.1)

MMU painting works (already tested but double checking)
(left - this PR, Right 2.1.1)

Used 50% XY scaling for effect :D

So yeap, the prusa approach & code seems pretty comprehensive and well thought out (as expected :) )

[Noisyfox]

Awesome!

[SoftFever]

Awesome.
Thank you!!!

[igiannakas]

No worries :) 🎉