Subdivision creasing inconsistent #73432

New Issue

george b · 2020-01-27T13:51:55+01:00

george b commented

2020-01-27 13:51:55 +01:00

System Information
Operating system: Windows-10-10.0.18362-SP0 64 Bits
Graphics card: GeForce RTX 2070/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 441.87

Blender Version
Broken: version: 2.82 (sub 6), branch: master, commit date: 2020-01-24 17:48, hash: fc1f5bded4
Worked: (optional)

Creasing will produce inconsistent effects on edges. For the same creasing amount the sharpness is dramatically different.
Also the creasing values above 0.5 have the same effect as 1.
Adjusting the quality in on the subdivision modifier either amplifies the creasing and implicitly the problem at maximum value (6) and at minimum (1) will prevent any effect from creasing values above 0.5. I use 2 or 3 subdivision leveles.
I am aware of at least one report with a similar issue here: https://developer.blender.org/T68200
It has been closed but I think the problem persists.

Exact steps for others to reproduce the error
Any complex mesh with a level 2 or 3 subdividion modifier. and creasing values above 0.4 on irregular loops.

**System Information** Operating system: Windows-10-10.0.18362-SP0 64 Bits Graphics card: GeForce RTX 2070/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 441.87 **Blender Version** Broken: version: 2.82 (sub 6), branch: master, commit date: 2020-01-24 17:48, hash: `fc1f5bded4` Worked: (optional) Creasing will produce inconsistent effects on edges. For the same creasing amount the sharpness is dramatically different. Also the creasing values above 0.5 have the same effect as 1. Adjusting the quality in on the subdivision modifier either amplifies the creasing and implicitly the problem at maximum value (6) and at minimum (1) will prevent any effect from creasing values above 0.5. I use 2 or 3 subdivision leveles. I am aware of at least one report with a similar issue here: https://developer.blender.org/T68200 It has been closed but I think the problem persists. **Exact steps for others to reproduce the error** Any complex mesh with a level 2 or 3 subdividion modifier. and creasing values above 0.4 on irregular loops.![creasing_problem2.png](https://archive.blender.org/developer/F8304894/creasing_problem2.png) ![creasing_problem3.png](https://archive.blender.org/developer/F8304896/creasing_problem3.png) ![creasing_problem4.png](https://archive.blender.org/developer/F8304898/creasing_problem4.png)

george b commented

2020-01-27 13:51:55 +01:00

Added subscriber: @GeRo

Stanislav Blinov commented

2020-01-27 15:36:20 +01:00

Added subscriber: @Stan_Pancakes

Stanislav Blinov commented

2020-01-27 15:36:20 +01:00

As far as I can tell, the problems on your last two screenshots aren't due to creasing (well, not exactly); they're due to Auto-Smooth angle. Contrary to what you're describing, creasing values above 0.5 do work; but the more you crease, the more sharp the angle between newly created faces, to a point where it gets picked up by Auto-Smooth and so splits the normals.
Remember that creases are indeed relative, so the more geometry your base mesh has (and/or the more subdivision levels you add), they will affect the object differently.

As far as I can tell, the problems on your last two screenshots aren't due to creasing (well, not exactly); they're due to Auto-Smooth angle. Contrary to what you're describing, creasing values above 0.5 do work; but the more you crease, the more sharp the angle between newly created faces, to a point where it gets picked up by Auto-Smooth and so splits the normals. Remember that creases are indeed relative, so the more geometry your base mesh has (and/or the more subdivision levels you add), they will affect the object differently.

george b commented

2020-01-27 16:53:24 +01:00

Increasing the smoothing angle seems to fix it. I didn't think about this correlation.
Thank you very much!

Increasing the smoothing angle seems to fix it. I didn't think about this correlation. Thank you very much!

george b commented

2020-01-27 16:55:18 +01:00

Changed status from 'Needs Triage' to: 'Archived'

george b closed this issue

2020-01-27 16:55:18 +01:00

Sign in to join this conversation.

No Label

Download

What's New

Blender Studio

Manual

Developers Blog

Documentation

Benchmark

Blender Conference

Development Fund

One-time Donations

Subdivision creasing inconsistent #73432