BMesh boolean fails to fill holes with very low threshold value #47019

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opened 2015-12-19 12:54:20 +01:00 by Leon Cheung · 10 comments
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System Information
Win8.1 64bit | GTX680

Blender Version
Broken: Blender 2.76.4 ef49632
Worked: N/A

Short description of error

Bmesh boolean can sometimes fail to cut holes like below:

bmesh_boolean_fails_case2.png
b_case2.blend

Exact steps for others to reproduce the error
Please see attached file, thanks.

**System Information** Win8.1 64bit | GTX680 **Blender Version** Broken: Blender 2.76.4 ef49632 Worked: N/A **Short description of error** Bmesh boolean can sometimes fail to cut holes like below: ![bmesh_boolean_fails_case2.png](https://archive.blender.org/developer/F269618/bmesh_boolean_fails_case2.png) [b_case2.blend](https://archive.blender.org/developer/F269619/b_case2.blend) **Exact steps for others to reproduce the error** Please see attached file, thanks.
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Changed status to: 'Open'

Changed status to: 'Open'
Campbell Barton was assigned by Leon Cheung 2015-12-19 12:54:20 +01:00
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Added subscriber: @ZhangYu

Added subscriber: @ZhangYu

Added subscriber: @zeauro

Added subscriber: @zeauro

Problem seems to be related to object scale.
Different problems are visible at different scales.
Bmesh_Booleans.jpg

For this blend, Calculate Holes option seems to work correctly at any scale if Threshold is increased to 0.0000001.

Problem seems to be related to object scale. Different problems are visible at different scales. ![Bmesh_Booleans.jpg](https://archive.blender.org/developer/F269632/Bmesh_Booleans.jpg) For this blend, Calculate Holes option seems to work correctly at any scale if Threshold is increased to 0.0000001.

Added subscriber: @Sergey

Added subscriber: @Sergey
Campbell Barton changed title from Bmesh Boolean Fails in Certain Case to BMesh boolean fails to fill holes with very low threshold value 2015-12-21 09:12:29 +01:00

Increasing the threshold to 0.0000001 and this problem goes away, nevertheless this needs investigating.

Increasing the threshold to `0.0000001` and this problem goes away, nevertheless this needs investigating.
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Yes. Another thing here is : we have to manually type "000001‘ after the default editable "0.0" value. And, if clicking on arrows, it only allows increasing / decreasing by increment of 0.01, instead of 0.0000001), which is not that easy to control as well imho. So, maybe it is reasonable to set a higher scale for this value for easy tweaking.

Yes. Another thing here is : we have to manually type "000001‘ after the default editable "0.0" value. And, if clicking on arrows, it only allows increasing / decreasing by increment of 0.01, instead of 0.0000001), which is not that easy to control as well imho. So, maybe it is reasonable to set a higher scale for this value for easy tweaking.
Campbell Barton removed their assignment 2016-08-03 06:35:10 +02:00

Added subscriber: @ideasman42

Added subscriber: @ideasman42
Campbell Barton self-assigned this 2016-08-03 06:41:58 +02:00

Changed status from 'Open' to: 'Resolved'

Changed status from 'Open' to: 'Resolved'

With defaults, BMesh boolean now works with this example. Also, the UI is set so entering very small values isn't such a problem.

Closing.

With defaults, BMesh boolean now works with this example. Also, the UI is set so entering very small values isn't such a problem. Closing.
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Reference: blender/blender#47019
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