Object masking via Boolean Difference leads to damaged object. #85933

New Issue

Dan Rockstreet · 2021-02-23T23:34:12+01:00

Dan Rockstreet commented

2021-02-23 23:34:12 +01:00

System Information
Operating system: Windows 10
Graphics card: Nvidia GeForce GTX 750

Blender Version
Broken: 2.91.2 2021-01-19 16:15 Hash 5be9ef4177
Worked: ..

Short description of error
Boolean function "Difference" not working correctly, regardless if done in Blender with CTRL + Minus or via BoolTool
All objects have the Scale applied, in order to avoid any scaling problems

Exact steps for others to reproduce the error

a narrow and long cube is arrayed by "object offset", a rotated Empty (red, green and blue objects called Laser_red, Laser_green, Laser_blue)
I wanted to mask the lasers behind the cylinder bars
3.a. Laser_red without masking. Laser_red directly perpendicular to cylnder bar
3.b. Laser_blue with masking object "Mask_cube_blue", to hide laser beams behind bar. Laser_blue directly perpendicular to cylnder bar
3.c. Laser_green with masking obejct "Mask_cube_green" behind cylinder ba, like 3.b. The laser_green, though, is slightly rotated. Additionally, array Modifier was applied.

In Laser_blue, 1 laser beam is missing.
In Laser_Green, many laser beams are missing.

Laser_beams.blend

**System Information** Operating system: Windows 10 Graphics card: Nvidia GeForce GTX 750 **Blender Version** Broken: 2.91.2 2021-01-19 16:15 Hash 5be9ef417703 Worked: .. **Short description of error** Boolean function "Difference" not working correctly, regardless if done in Blender with CTRL + Minus or via BoolTool All objects have the Scale applied, in order to avoid any scaling problems **Exact steps for others to reproduce the error** 1. a narrow and long cube is arrayed by "object offset", a rotated Empty (red, green and blue objects called Laser_red, Laser_green, Laser_blue) 2. I wanted to mask the lasers behind the cylinder bars 3.a. Laser_red without masking. Laser_red directly perpendicular to cylnder bar 3.b. Laser_blue with masking object "Mask_cube_blue", to hide laser beams behind bar. Laser_blue directly perpendicular to cylnder bar 3.c. Laser_green with masking obejct "Mask_cube_green" behind cylinder ba, like 3.b. The laser_green, though, is slightly rotated. Additionally, array Modifier was applied. In Laser_blue, 1 laser beam is missing. In Laser_Green, many laser beams are missing. ![grafik.png](https://archive.blender.org/developer/F9832802/grafik.png) [Laser_beams.blend](https://archive.blender.org/developer/F9832807/Laser_beams.blend)

Dan Rockstreet commented

2021-02-23 23:34:12 +01:00

Added subscriber: @dan.rockstreet

Jesse Yurkovich commented

2021-02-24 01:28:53 +01:00

Added subscriber: @deadpin

Jesse Yurkovich commented

2021-02-24 01:28:53 +01:00

It looks like enabling the Self option for the booleans allows much better results in both cases. However, it causes a great increase in processing time.

The issue is probably due to a lot of overlapping "blades" of the lasers, not the boolean object per-se:

It looks like enabling the `Self` option for the booleans allows much better results in both cases. However, it causes a great increase in processing time. The issue is probably due to a lot of overlapping "blades" of the lasers, not the boolean object per-se: ![blade-overlap.png](https://archive.blender.org/developer/F9833038/blade-overlap.png)

Falk David commented

2021-02-24 12:30:46 +01:00

Added subscriber: @filedescriptor

Falk David commented

2021-02-24 12:30:46 +01:00

Changed status from 'Needs Triage' to: 'Needs User Info'

Falk David commented

2021-02-24 12:30:46 +01:00

I cannot reproduce this on the latest 2.93.0 Alpha, branch: master, commit date: 2021-02-24 05:16, hash: 8d50a3e19e.

It seems that the beta still has this issue, although, as @deadpin mentioned, you could use the Self option to solve this.
~~Could you try the latest alpha from https://builder.blender.org/download/? ~~

EDIT: I just noticed that the alpha version also removes some beams, but different ones. Using Self works though.

I cannot reproduce this on the latest 2.93.0 Alpha, branch: master, commit date: 2021-02-24 05:16, hash: `8d50a3e19e`. ![image.png](https://archive.blender.org/developer/F9834467/image.png) It seems that the beta still has this issue, although, as @deadpin mentioned, you could use the `Self` option to solve this. ~~Could you try the latest alpha from https://builder.blender.org/download/? ~~ EDIT: I just noticed that the alpha version also removes some beams, but different ones. Using `Self` works though.

Dan Rockstreet commented

2021-02-24 13:47:15 +01:00

Hi Jesse/David

thanks for spending time on answering.

Using "Self" works indeed, but in my system with GTX 750 it gets so very slow... also in 2.93.0 alpha
Impossible to use in a live presentation where I can check if the laser beams are safe or not in certain situations.

I tested with the Solver set to "Fast" instead of "Exact" and it works - all beams are now viewable. Probably this is the opposite of what to expect between Fastand Exact;-)

Hi Jesse/David thanks for spending time on answering. Using "Self" works indeed, but in my system with GTX 750 it gets so very slow... also in 2.93.0 alpha Impossible to use in a live presentation where I can check if the laser beams are safe or not in certain situations. I tested with the Solver set to "Fast" instead of "Exact" and it works - all beams are now viewable. Probably this is the opposite of what to expect between *Fast*and *Exact*;-) ![grafik.png](https://archive.blender.org/developer/F9834728/grafik.png)

Falk David commented

2021-02-26 08:58:11 +01:00

Changed status from 'Needs User Info' to: 'Archived'

Falk David closed this issue

2021-02-26 08:58:11 +01:00

Falk David commented

2021-02-26 08:58:11 +01:00

Will close this for now as it seems to work properly with "Self". Feel free to open a new report if you have any other issues.

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Object masking via Boolean Difference leads to damaged object. #85933