Applying screw modifier doesn't respect hide status of edges from edit mode. #107553
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Reference: blender/blender#107553
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UPDATE: If the Unhide hotkey is used, despite no parts actaully being "unhidden", the uneditable parts become editable.
System Information
Operating system: Windows-10-10.0.19044-SP0 64 Bits
Graphics card: NVIDIA GeForce RTX 3070/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 531.61
Blender Version
Broken: version: 3.5.0, branch: blender-v3.5-release, commit date: 2023-03-29 02:56, hash:
1be25cfff18bWorked: (newest version of Blender that worked as expected)
Short description of error
Applying a screw modifier with parts of mesh hidden in edit mode will result in those generated mesh from hidden parts to:
when going back to edit mode.
Original description:
If certain parts of a mesh with a screw modifier are hidden in edit mode (though still visible with the screw modifier, just not selectable), and then the modifier is applied to the mesh in object mode, the previously hidden parts will become uneditable, though still selectable in edit mode.
Exact steps for others to reproduce the error
Because of the update from experimenting, I guess this means the bug is more of a visual one - that objects which were hidden before the screw modifier was applied should be hidden afterwards too, and act like they are despite being visible and selectable.
I don't understand what the bug is. This is a short behavior, you just don't see the same part and its copies?
I think they're pointing out that if you apply a screw modifier and the mesh had some hidden geometry, the resultant mesh created from the hidden geometry will have their faces and vertices hidden, but their edges visible. This isn't a usual state of mesh geometry (usually if a vertex is hidden, all its edges and faces are hidden too), but I don't know if it's a bug.
When parts of a mesh have their edges visible, but faces and vertices hidden, they cannot be operated on by most tools, such as moving/rotating/scaling, so I can see why these parts of the mesh appear to be uneditable (Loop Cut and Spin do actually still work for example).
Here I had a mesh with two planes, one visible in the middle and one moved to the side and hidden. The geometry created from the hidden plane has everything hidden aside from its edges:
The resultant geometry having an unusual mix of hide states seems to have been present even back in 2.80, though I did notice that it changed slightly in 3.4.1. In 3.3.6 and earlier, some of the edges were hidden in the result:
Attached is an example .blend (authored in 3.3.6) with a mesh and Screw modifier set up:
By applying screw modifier with parts of the mesh hidden, I managed to get this, which proves that "the previously hidden parts will become uneditable, though still selectable in edit mode."
Selectable under edge select mode, but not editable.
To me the problem looks like that: Screw modifier didn't set appropriate hide flags for mesh edges, since other modifiers like mirror, when performing the same action there will be no "ghost lines".
Hiding parts of a mesh and then appliyng a screw modifier prevents the previously hidden parts from being edited.to Applying screw modifier doesn't respect hide status of edges from edit mode.