Difference Boolean Modifier does not work in most simple cases with Array Modifier #52329

New Issue

John Thomas · 2017-08-10T09:58:26+02:00

John Thomas commented

2017-08-10 09:58:26 +02:00

System Information
Win7-x64
nVidia GeForce - 1060

Blender Version
Broken: 2.79.RC (Hash: 5e9132b)

Short description of error
The Difference Boolean Modifier does not correctly 'cut' the main object when the second object (the one which will cut the main one) is an array of objects.

Exact steps for others to reproduce the error

With an empty scene do:

Add a cube, scale it to x,y,z = 5,5,0.3 in order to make a plaque. Let's name it "Cube"
Add a cube, scale it to x,y,z= 0.5,0.5,1 in order to make a small pillar. Let's name it "Cube 001"
On "Cube 001" add an Array modifier with Count: 8 and Relative Offset x,y,z=1.2,0,0.
On "Cube 001" add another Array modifier with Count: 7 and Relative Offset x,y,z=0,1.4,0. Our target is to have a square of pillars with some spaces between them.
Place this array in order to intersect the plaque created at step 1. (see the attached file for an example)
On "Cube" (our plaque) add a Boolean Modifier, choose Difference (Bmesh) and select the "Cube 001" as the other boolean operator.
Press "Apply" on the modifier added at step 6
Delete the "Cube 001"

Expected: "Cube" should appear as a normal grid of square holes.

Actual: "Cube" has some holes filled up and some holes filled only by half by some faces left by. The result varies upon on relative placement between the array and the plaque and upon of other factors (distance between the pillars, number of them etc.). Rotate, zoom, pan and look in each hole to see. I attached also a JPG here to show the phenomenon.

Just execute the steps 7 and 8 on the attached blend file and examine it.

Array-Difference-Bug.blend
Based on a (as simple as possible) attached .blend file with minimum amount of steps

Array-Difference-Bug_ubertest.blend edited: A more comprehensive example for reference (animated at multiple scales) ~ ideasman42

**System Information** Win7-x64 nVidia GeForce - 1060 **Blender Version** Broken: 2.79.RC (Hash: 5e9132b) **Short description of error** The Difference Boolean Modifier does not correctly 'cut' the main object when the second object (the one which will cut the main one) is an array of objects. **Exact steps for others to reproduce the error** With an empty scene do: 1. Add a cube, scale it to x,y,z = 5,5,0.3 in order to make a plaque. Let's name it "Cube" 2. Add a cube, scale it to x,y,z= 0.5,0.5,1 in order to make a small pillar. Let's name it "Cube 001" 3. On "Cube 001" add an Array modifier with Count: 8 and Relative Offset x,y,z=1.2,0,0. 4. On "Cube 001" add another Array modifier with Count: 7 and Relative Offset x,y,z=0,1.4,0. Our target is to have a square of pillars with some spaces between them. 5. Place this array in order to intersect the plaque created at step 1. (see the attached file for an example) 6. On "Cube" (our plaque) add a Boolean Modifier, choose Difference (Bmesh) and select the "Cube 001" as the other boolean operator. 7. Press "Apply" on the modifier added at step 6 8. Delete the "Cube 001" Expected: "Cube" should appear as a normal grid of square holes. Actual: "Cube" has some holes filled up and some holes filled only by half by some faces left by. The result varies upon on relative placement between the array and the plaque and upon of other factors (distance between the pillars, number of them etc.). Rotate, zoom, pan and look in each hole to see. I attached also a JPG here ![Blender-bug-diff-array.JPG](https://archive.blender.org/developer/F703393/Blender-bug-diff-array.JPG) to show the phenomenon. Just execute the steps 7 and 8 on the attached blend file and examine it. [Array-Difference-Bug.blend](https://archive.blender.org/developer/F703381/Array-Difference-Bug.blend) Based on a (as simple as possible) attached .blend file with minimum amount of steps [Array-Difference-Bug_ubertest.blend](https://archive.blender.org/developer/F707916/Array-Difference-Bug_ubertest.blend) edited: A more comprehensive example for reference (animated at multiple scales) ~ ideasman42

John Thomas commented

2017-08-10 09:58:26 +02:00

Changed status to: 'Open'

John Thomas commented

2017-08-10 09:58:26 +02:00

Added subscriber: @m.Th

Sergey Sharybin commented

2017-08-10 10:06:05 +02:00

Added subscribers: @ideasman42, @Sergey

Campbell Barton was assigned by Sergey Sharybin

2017-08-10 10:06:05 +02:00

Sergey Sharybin commented

2017-08-10 10:06:05 +02:00

@ideasman42, this is one of the cases when BMesh boolean is failing. Mind having a look? :)

blender-admin commented

2017-08-12 10:14:50 +02:00

This issue was referenced by a4bcdf5fb1

This issue was referenced by a4bcdf5fb1a7afc85b464c35b359e627907db2e0

Campbell Barton commented

2017-08-12 10:47:30 +02:00

Changed status from 'Open' to: 'Resolved'

Campbell Barton closed this issue

2017-08-12 10:47:30 +02:00

John Thomas commented

2017-08-15 11:47:17 +02:00

Changed status from 'Resolved' to: 'Open'

John Thomas reopened this issue

2017-08-15 11:47:17 +02:00

John Thomas commented

2017-08-15 11:47:17 +02:00

Thanks a lot! Somethingis indeed improved. However the bug is still present in 2.79 - 66c1b23 (Date: 2017-08-14 23:22)

The original attached blend file works ok now.

...but the newly attached one does not. (I moved a little the plaque). Take a closer look at "holes". Some of them are half-filed with residue faces.

Array-Difference-Bug-2.blend

Thanks a lot! *Something*is indeed improved. However the bug is still present in 2.79 - 66c1b23 (Date: 2017-08-14 23:22) The original attached blend file works ok now. ...but the newly attached one does not. (I moved a little the plaque). Take a closer look at "holes". Some of them are half-filed with residue faces. [Array-Difference-Bug-2.blend](https://archive.blender.org/developer/F712982/Array-Difference-Bug-2.blend)

Campbell Barton commented

2017-09-12 08:33:11 +02:00

Changed status from 'Open' to: 'Resolved'

Campbell Barton closed this issue

2017-09-12 08:33:11 +02:00

Campbell Barton commented

2017-09-12 08:33:11 +02:00

@m.Th I didn't see you re-opened this report - and now its too late, 2.79 is already released.

Can you open a new report since the original one is fixed (including a test at multiple scales and animated rotations).

@m.Th I didn't see you re-opened this report - and now its too late, 2.79 is already released. Can you open a new report since the original one is fixed *(including a test at multiple scales and animated rotations).*

Campbell Barton commented

2017-09-19 17:37:56 +02:00

@m.Th - this is in fact not an error in booleans, its an error in face-filling.

Good find, we didn't have reports in this part of the code in years :)

@m.Th - this is in fact not an error in booleans, its an error in face-filling. Good find, we didn't have reports in this part of the code in years :)

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Difference Boolean Modifier does not work in most simple cases with Array Modifier #52329