Mirror plane 'Clipping' does not appear to do anything #81417

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Jacob Merrill · 2020-10-03T17:00:58+02:00

Jacob Merrill commented

2020-10-03 17:00:58 +02:00

Operating system: win64 / nvidia 1070 / 32 gigs ram

Blender Version
Broken:2.9x

Short description of error
when we apply a mirror to a shape like this

with clipping on I would expect it to act like this

but instead we get this

Exact steps for others to reproduce the error
Based on the default startup or an attached .blend file (as simple as possible).

Operating system: win64 / nvidia 1070 / 32 gigs ram **Blender Version** Broken:2.9x **Short description of error** when we apply a mirror to a shape like this ![image.png](https://archive.blender.org/developer/F8951097/image.png) with clipping on I would expect it to act like this ![image.png](https://archive.blender.org/developer/F8951105/image.png) but instead we get this ![image.png](https://archive.blender.org/developer/F8951109/image.png) **Exact steps for others to reproduce the error** Based on the default startup or an attached .blend file (as simple as possible).

Jacob Merrill commented

2020-10-03 17:00:58 +02:00

Added subscriber: @JacobMerrill-1

Jacob Merrill commented

2020-10-03 17:01:38 +02:00

not_clipping.blend

[not_clipping.blend](https://archive.blender.org/developer/F8951114/not_clipping.blend)

Henrik D. commented

2020-10-03 17:42:33 +02:00

Added subscriber: @HDMaster84

Henrik D. commented

2020-10-03 17:42:33 +02:00

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

Henrik D. closed this issue

2020-10-03 17:42:33 +02:00

Henrik D. self-assigned this 2020-10-03 17:42:33 +02:00

Henrik D. commented

2020-10-03 17:42:33 +02:00

Clipping is not bisect, and bisect is also not exactly what you seem to want here, but close. Clipping is working correctly in the given example file.

For reference read the manual at https://docs.blender.org/manual/en/dev/modeling/modifiers/generate/mirror.html

Clipping is not bisect, and bisect is also not exactly what you seem to want here, but close. Clipping is working correctly in the given example file. For reference read the manual at https://docs.blender.org/manual/en/dev/modeling/modifiers/generate/mirror.html

Octave C commented

2020-10-03 17:51:20 +02:00

Added subscriber: @toctave

Octave C commented

2020-10-03 17:51:20 +02:00

Hello! I think you misunderstood what the 'clipping' option does. As it stands, having clipping turned on will prevent you from moving a vertex from one side of the mirror plane to the other.

That being said, what you expected is another feature, that could be added as well. Could you elaborate on potential use cases ? As it stands, I feel like turning clipping on, then moving vertices along the mirror axis so that they sit on the mirror plane is easy enough. Another issue with that feature would be what exactly you mean by clipping : if it's interpreted as an actual boolean difference operation, it might ruin the topology of the mesh, and if it's just projecting vertices on the mirror plane, it could potentially deform it quite a bit.

As I see it, both actions can be accomplished quite easily with other tools (boolean modifier sitting on top, or edit mode manipulations), so there is no need to add complexity to the mirror modifier itself.

Hello! I think you misunderstood what the 'clipping' option does. As it stands, having clipping turned on will prevent you from moving a vertex from one side of the mirror plane to the other. That being said, what you expected is another feature, that could be added as well. Could you elaborate on potential use cases ? As it stands, I feel like turning clipping on, then moving vertices along the mirror axis so that they sit on the mirror plane is easy enough. Another issue with that feature would be what exactly you mean by clipping : if it's interpreted as an actual boolean difference operation, it might ruin the topology of the mesh, and if it's just projecting vertices on the mirror plane, it could potentially deform it quite a bit. As I see it, both actions can be accomplished quite easily with other tools (boolean modifier sitting on top, or edit mode manipulations), so there is no need to add complexity to the mirror modifier itself.

Jacob Merrill commented

2020-10-03 18:41:45 +02:00

"Prevents vertices from moving through the mirror plane(s) when you transform them in Edit Mode."

Ah - I was thinking it did

for vert in vertices:
   if vert.co[axis]>value:
       mirror this vertex
   else:
       clip

from what I understand this would be quite a bit cheaper under the hood than bool.

I made a space ship - modified one side, and wanted to remove the other side and mirror the 'good' side.

edit:
ah yes 'bisect' is what I was thinking clip did !!

thank you!

"Prevents vertices from moving through the mirror plane(s) when you transform them in Edit Mode." Ah - I was thinking it did ``` for vert in vertices: if vert.co[axis]>value: mirror this vertex else: clip ``` from what I understand this would be quite a bit cheaper under the hood than bool. I made a space ship - modified one side, and wanted to remove the other side and mirror the 'good' side. edit: ah yes 'bisect' is what I was thinking clip did !! thank you!

Joseph Eagar commented

2020-10-04 13:22:53 +02:00

Added subscriber: @JosephEagar

Joseph Eagar commented

2020-10-04 13:22:53 +02:00

What you want is the symmetrize tool (embarrassingly I just learned about it a few days ago myself). Quite handy.

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Mirror plane 'Clipping' does not appear to do anything #81417