Knife Project does not select inside faces #49328

New Issue

Jaagup Irve · 2016-09-12T17:05:09+02:00

Jaagup Irve commented

2016-09-12 17:05:09 +02:00

Blender Version
Broken: 2.77

Short description of error
Knife Project tool does not select everything inside the projected area, preventing its use in a script.

Exact steps for others to reproduce the error

Open attached knifetool.blend
Click "Knife Project"
Click "Cut through" (optional, but makes a better case here)

Synopsis
Blender does not select everything covered with the projecting mesh, only the inside area it actually changes. We want to erase everything outside of the projecting plane subsequent inversion and deletion thus erases the two cubes we would like to retain.

Background
We use Blender for our isometric game map design and need to cut the map into pieces.

We had a working script for tiling which used a stretched cube which was parented to camera and all other meshes had intersect modifier referring to that cube, but the intersection modifier is highly unreliable with overlapping or open meshes, also crashes a lot, so we started investigating the use of the knife project tool in our custom addon.

**Blender Version** Broken: 2.77 **Short description of error** Knife Project tool does not select everything inside the projected area, preventing its use in a script. **Exact steps for others to reproduce the error** 1. Open attached [knifetool.blend](https://archive.blender.org/developer/F358640/knifetool.blend) 2. Click "Knife Project" 3. Click "Cut through" (optional, but makes a better case here) ![2016-09-12_17-32-20.png](https://archive.blender.org/developer/F358638/2016-09-12_17-32-20.png) **Synopsis** Blender does not select everything covered with the projecting mesh, only the inside area it actually changes. We want to erase everything outside of the projecting plane subsequent inversion and deletion thus erases the two cubes we would like to retain. **Background** We use Blender for our isometric game map design and need to cut the map into pieces. We had a working script for tiling which used a stretched cube which was parented to camera and all other meshes had intersect modifier referring to that cube, but the intersection modifier is highly unreliable with overlapping or open meshes, also crashes a lot, so we started investigating the use of the knife project tool in our custom addon.

Jaagup Irve commented

2016-09-12 17:05:09 +02:00

Changed status to: 'Open'

Jaagup Irve commented

2016-09-12 17:05:09 +02:00

Added subscriber: @irve

Sergey Sharybin commented

2016-09-21 11:06:48 +02:00

Added subscribers: @mont29, @Sergey

Sergey Sharybin commented

2016-09-21 11:06:48 +02:00

To me this seems to be more a feature request / request to change default behavior for a particular use.

The thing here is that current behavior is really close to what regular knife is doing -- it only selects things which it touched. So from this point of view, projeciton knife is totally making sense.

@mont29, unless you think this is a subject which needs changing would consider this a TODO. If this is something what everyone wants we might change the behavior, but then it might also cause some other tools reconsideration..

To me this seems to be more a feature request / request to change default behavior for a particular use. The thing here is that current behavior is really close to what regular knife is doing -- it only selects things which it touched. So from this point of view, projeciton knife is totally making sense. @mont29, unless you think this is a subject which needs changing would consider this a TODO. If this is something what everyone wants we might change the behavior, but then it might also cause some other tools reconsideration..

Bastien Montagne commented

2016-10-11 17:58:37 +02:00

Changed status from 'Open' to: 'Archived'

Bastien Montagne closed this issue

2016-10-11 17:58:37 +02:00

Bastien Montagne self-assigned this 2016-10-11 17:58:37 +02:00

Bastien Montagne commented

2016-10-11 17:58:37 +02:00

Thanks for the report, but agree with @Sergey here, this is definitively not a bug, the unselected parts of the mesh are isolated islands… To know whether we want to select that or not is feature request/design topic.

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Knife Project does not select inside faces #49328