Split by Part + X-Y Hole Compensation causes jagged edges

[ctadlock]

Also posted on SoftFever: SoftFever/OrcaSlicer#342

If a multi-solid model is imported and it is split by part and "X-Y hole compensation" is non-zero, the resulting slicing has small holes in it. This does not happen if the model is split by object or if the xy hole compensation is 0.

This is not model related and can be reproduced with any multi-solid model.

To Reproduce
Steps to reproduce the behavior:

1. Import a multi-solid model (use attached as an example)
2. Set "X-Y hole compensation" to 0.1
3. Split by part
4. Slicer

box.zip

Expected behavior
The slicing is clean.

• Windows 11
• 1.4.2.13
• Also happens with Softfever

Screenshots

Difference between split by object and part (two examples)

Poor quality result

High quality result when split by object (two examples)

[ctadlock]

SuperSlicer has this same issue. I think everyone just copied the same code/bug:

[QingZhangBambu]

the color object should better not use X-Y hole compensation, we will add a warning msg

[QingZhangBambu]

we will fix it as fast as possible

[QingZhangBambu]

you can set the resolution to 0.0 which could fix that