Change Details

**System Information** Operating system: Linux (NixOS) Graphics card: Intel **Blender Version** Broken: 2.91.2 Worked: 2.83.5 **Short description of error** Smart UV mapping seems to work significantly worse (at least for my test case) since the C rewrite, which landed in 2.91.2 (I think). Before: {F9837916} After: {F9837918} Test mesh: {F9837923} **Exact steps for others to reproduce the error** Perform Smart UV mapping on the mesh, as detailed in this video: https://www.youtube.com/watch?v=illIxYKb-1k

**System Information** Operating system: Linux (NixOS) Graphics card: Intel **Blender Version** Broken: 2.91.2 Worked: 2.83.5 **Short description of error** Smart UV mapping seems to work significantly worse (at least for my test case) since the C rewrite, which landed in 2.91.2 (I think). **Exact steps for others to reproduce the error** - Import uploaded file - In UV editing workspace -> {nav UV > Unwrap > Smart UV Project} - Expand redo panel -> change `Island Margin` to 0.03 video: https://www.youtube.com/watch?v=illIxYKb-1k Test mesh: {F9837923} | After | Before | | {F9837918} | {F9837916} |

**System Information** Operating system: Linux (NixOS) Graphics card: Intel **Blender Version** Broken: 2.91.2 Worked: 2.83.5 **Short description of error** Smart UV mapping seems to work significantly worse (at least for my test case) since the C rewrite, which landed in 2.91.2 (I think). Before: {F9837916} After: {F9837918}**Exact steps for others to reproduce the error** - Import uploaded file - In UV editing workspace -> {nav UV > Unwrap > Smart UV Project} - Expand redo panel -> change `Island Margin` to 0.03 video: https://www.youtube.com/watch?v=illIxYKb-1k Test mesh: {F9837923} **Exact steps for others to reproduce the error** Perform Smart UV mapping on the mesh, as detailed in this video: https://www.youtube.com/watch?v=illIxYKb-1k | After | Before | | {F9837918} | {F9837916} |