Overhangs aren't highlighted when calculating supports by overlap percentage #449

New Issue

MrUnknownDE · 2026-04-05T16:21:04+02:00

MrUnknownDE commented

2026-04-05 16:21:04 +02:00

Originally created by @Felix14-v2 on 3/5/2026

OrcaSlicer version

2.3.2-RC

How to reproduce

Create a new project
Enable Show overhang
Add a model with overhangs (sphere or 3D Benchy for example)
Enable supports and set the overhang threshold angle to 30° (for example)
Overhangs should be highlighted
Now try to set overhang threshold overlap (40% for example). Here's the problem: you can only do that by disabling the previous option by setting it to 0. And doing that essentially disables the highlight.

Actual results

Highlight is missing

threshold angle	threshold overlap

Expected results

Calculating overhang highlights correctly based on overlap threshold is a difficult task. It requires taking into account per-object layer height, variable layer height, layer modifiers, line widths and other things. So, if we aren't talking about perfect solution, it would be nice to have at least a simple fallback method assuming that the layer height and line width (external perimeter) are constant.

Anything else?

I have searched the existing issues

*Originally created by @Felix14-v2 on 3/5/2026* ### OrcaSlicer version 2.3.2-RC ### How to reproduce 1. Create a new project 2. Enable `Show overhang` 3. Add a model with overhangs (sphere or 3D Benchy for example) 4. Enable supports and set the overhang `threshold angle` to `30°` (for example) 5. Overhangs should be highlighted 6. Now try to set overhang `threshold overlap` (`40%` for example). Here's the problem: you can only do that by disabling the previous option by setting it to `0`. And doing that essentially disables the highlight. ### Actual results Highlight is missing | threshold angle| threshold overlap | |:-:|:-:| | <img width="2560" height="1516" alt="Image" src="https://github.com/user-attachments/assets/f31555a3-2c1b-40a6-af35-3cda98c11bee" /> | <img width="2560" height="1516" alt="Image" src="https://github.com/user-attachments/assets/3a034862-b95e-41fc-936d-12ea96563967" /> | ### Expected results Calculating overhang highlights correctly based on overlap threshold is a difficult task. It requires taking into account per-object layer height, variable layer height, layer modifiers, line widths and other things. So, if we aren't talking about perfect solution, it would be nice to have at least a simple fallback method assuming that the layer height and line width (external perimeter) are constant. ### Anything else? - [x] I have searched the existing issues

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Reference: github/OrcaSlicer#449