Subdivision Modifier Glitch #66288

New Issue

James Bartucciotto · 2019-07-01T03:39:00+02:00

2019-07-01 03:39:00 +02:00

Operating system: MacOS 10.14.5
Graphics card: RX Vega 56
Broken: Version 2.80 (2019-06-26)

ERROR

One edge is sharp despite the proper geometry used in tandem with a Subdivision modifier. I've tried deleting and recreating the edge which will give random results depending on the order of steps usually. However, this is not consistent. Merging vertices based on distance does not fix anything either.

Exact steps for others to reproduce the error
Based on the default startup or an attached .blend file (as simple as possible). I don't know how to recreate exactly. I've attached the file and made a Vertex group named "ERROR EDGE" which will select the trouble edge.

Vector.blend

Operating system: MacOS 10.14.5 Graphics card: RX Vega 56 Broken: Version 2.80 (2019-06-26) **ERROR** One edge is sharp despite the proper geometry used in tandem with a Subdivision modifier. I've tried deleting and recreating the edge which will give random results depending on the order of steps usually. However, this is not consistent. Merging vertices based on distance does not fix anything either. **Exact steps for others to reproduce the error** Based on the default startup or an attached .blend file (as simple as possible). I don't know how to recreate exactly. I've attached the file and made a Vertex group named "ERROR EDGE" which will select the trouble edge. ![Screen Shot 2019-06-30 at 6.10.57 PM.png](https://archive.blender.org/developer/F7557870/Screen_Shot_2019-06-30_at_6.10.57_PM.png) [Vector.blend](https://archive.blender.org/developer/F7557876/Vector.blend)

James Bartucciotto commented

2019-07-01 03:39:00 +02:00

Added subscriber: @rawr-1

Marcin Twarowski commented

2019-07-01 08:34:51 +02:00

Added subscriber: @MarcinTwarowski

Marcin Twarowski commented

2019-07-01 08:34:51 +02:00

Part of your mesh is inside out. You can see it if you check "Face Orientation".

That's why I usually work with "Backface Culling" on.

Select all faces and recalculate normals. However, newly created faces shouldn't point in other direction, so maybe there is a bug somewhere.

Part of your mesh is inside out. You can see it if you check "Face Orientation". ![face_orientation.png](https://archive.blender.org/developer/F7558070/face_orientation.png) That's why I usually work with "Backface Culling" on. ![backface_culling.png](https://archive.blender.org/developer/F7558072/backface_culling.png) Select all faces and recalculate normals. However, newly created faces shouldn't point in other direction, so maybe there is a bug somewhere.

Brecht Van Lommel commented

2019-07-01 11:29:33 +02:00

Added subscriber: @brecht