Exact Boolean Modifyer Creates Missing Faces on Manifold Geometry #90024

New Issue

Matty Krosschell · 2021-07-21T16:46:57+02:00

Matty Krosschell commented

2021-07-21 16:46:57 +02:00

System Information
OS Name Microsoft Windows 10 Pro
Version 10.0.19041 Build 19041
Other OS Description Not Available
OS Manufacturer Microsoft Corporation
System Name DESKTOP-L8SM67L
System Manufacturer To Be Filled By O.E.M.
System Model To Be Filled By O.E.M.
System Type x64-based PC
System SKU To Be Filled By O.E.M.
Processor AMD Ryzen 7 2700X Eight-Core Processor, 3700 Mhz, 8 Core(s), 16 Logical Processor(s)
BIOS Version/Date American Megatrends Inc. P1.50, 2018-07-03
SMBIOS Version 3.0
Embedded Controller Version 255.255
BIOS Mode Legacy
BaseBoard Manufacturer ASRock
BaseBoard Product X470 Taichi
BaseBoard Version
Platform Role Desktop
Secure Boot State Unsupported
PCR7 Configuration Binding Not Possible
Windows Directory C:\Windows
System Directory C:\Windows\system32
Boot Device \Device\HarddiskVolume1
Locale United States
Hardware Abstraction Layer Version = "10.0.19041.1110"
User Name DESKTOP-L8SM67L\cryst
Time Zone Eastern Standard Time
Installed Physical Memory (RAM) 32.0 GB
Total Physical Memory 31.9 GB
Available Physical Memory 23.2 GB
Total Virtual Memory 36.7 GB
Available Virtual Memory 25.4 GB
Page File Space 4.75 GB
Page File C:\pagefile.sys
Kernel DMA Protection Off
Virtualization-based security Not enabled
Device Encryption Support Reasons for failed automatic device encryption: TPM is not usable, PCR7 binding is not supported, Hardware Security Test Interface failed and device is not Modern Standby, Un-allowed DMA capable bus/device(s) detected, TPM is not usable
Hyper-V - VM Monitor Mode Extensions Yes
Hyper-V - Second Level Address Translation Extensions Yes
Hyper-V - Virtualization Enabled in Firmware No
Hyper-V - Data Execution Protection Yes

Blender Version
Broken: 2.931
Worked: (newest version of Blender that worked as expected)

Short description of error

When an exact boolean modifier difference operator is applied to the arbitrary hemiconical solid provided in the blend.file marked "bug", if this modifier is applied the resulting mesh from the cone shape has a hole where it should be a face. I have also provided an additional blend.file that was constructed with the same method that worked as intended.

Exact steps for others to reproduce the error

Due to the chaotic nature of this operation, exact steps are impossible to give. However, I will give you the steps that I used.
In the first scene, I made 2 cones.
I pushed one cone into the other cone, and then used the exact boolean modifier to make an extraction, resulting in a hemiconical shell, shaped solid.
I then created a cylinder and scaled it up.
I elevated both of these a certain number of units a certain amount above the ground plane because I was working on a project.
After applying the original modifier, everything seemed great.
I then tried to use another enlarged cylinder to cut my hemiconical solid.
When I applied the modifier and removed the cylinder, I noticed that there was a missing face on the top of my hemiconical shape, unlike the successful example I provided.
Please note, that in the blend.files that I provided, I did not apply the modifiers. I did this so that you could fiddle with them in case I missed something or you could debug the code. bug.blend

working case.blend
Based on the default startup or an attached .blend file (as simple as possible).

**System Information** OS Name Microsoft Windows 10 Pro Version 10.0.19041 Build 19041 Other OS Description Not Available OS Manufacturer Microsoft Corporation System Name DESKTOP-L8SM67L System Manufacturer To Be Filled By O.E.M. System Model To Be Filled By O.E.M. System Type x64-based PC System SKU To Be Filled By O.E.M. Processor AMD Ryzen 7 2700X Eight-Core Processor, 3700 Mhz, 8 Core(s), 16 Logical Processor(s) BIOS Version/Date American Megatrends Inc. [P1](https://archive.blender.org/developer/P1.txt).50, 2018-07-03 SMBIOS Version 3.0 Embedded Controller Version 255.255 BIOS Mode Legacy BaseBoard Manufacturer ASRock BaseBoard Product X470 Taichi BaseBoard Version Platform Role Desktop Secure Boot State Unsupported PCR7 Configuration Binding Not Possible Windows Directory C:\Windows System Directory C:\Windows\system32 Boot Device \Device\HarddiskVolume1 Locale United States Hardware Abstraction Layer Version = "10.0.19041.1110" User Name DESKTOP-L8SM67L\cryst Time Zone Eastern Standard Time Installed Physical Memory (RAM) 32.0 GB Total Physical Memory 31.9 GB Available Physical Memory 23.2 GB Total Virtual Memory 36.7 GB Available Virtual Memory 25.4 GB Page File Space 4.75 GB Page File C:\pagefile.sys Kernel DMA Protection Off Virtualization-based security Not enabled Device Encryption Support Reasons for failed automatic device encryption: TPM is not usable, PCR7 binding is not supported, Hardware Security Test Interface failed and device is not Modern Standby, Un-allowed DMA capable bus/device(s) detected, TPM is not usable Hyper-V - VM Monitor Mode Extensions Yes Hyper-V - Second Level Address Translation Extensions Yes Hyper-V - Virtualization Enabled in Firmware No Hyper-V - Data Execution Protection Yes **Blender Version** Broken: 2.931 Worked: (newest version of Blender that worked as expected) **Short description of error** When an exact boolean modifier difference operator is applied to the arbitrary hemiconical solid provided in the blend.file marked "bug", if this modifier is applied the resulting mesh from the cone shape has a hole where it should be a face. I have also provided an additional blend.file that was constructed with the same method that worked as intended. **Exact steps for others to reproduce the error** Due to the chaotic nature of this operation, exact steps are impossible to give. However, I will give you the steps that I used. In the first scene, I made 2 cones. I pushed one cone into the other cone, and then used the exact boolean modifier to make an extraction, resulting in a hemiconical shell, shaped solid. I then created a cylinder and scaled it up. I elevated both of these a certain number of units a certain amount above the ground plane because I was working on a project. After applying the original modifier, everything seemed great. I then tried to use another enlarged cylinder to cut my hemiconical solid. When I applied the modifier and removed the cylinder, I noticed that there was a missing face on the top of my hemiconical shape, unlike the successful example I provided. Please note, that in the blend.files that I provided, I did not apply the modifiers. I did this so that you could fiddle with them in case I missed something or you could debug the code. [bug.blend](https://archive.blender.org/developer/F10232012/bug.blend) [working case.blend](https://archive.blender.org/developer/F10232013/working_case.blend) Based on the default startup or an attached .blend file (as simple as possible).

Matty Krosschell commented

2021-07-21 16:46:57 +02:00

Added subscriber: @matty686

Erik Abrahamsson commented

2021-07-21 21:16:54 +02:00

Added subscriber: @erik85

Erik Abrahamsson commented

2021-07-21 21:16:54 +02:00

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

Erik Abrahamsson commented

2021-07-21 21:16:54 +02:00

Hi, there has been some changes to boolean. Could you try this in the latest 3.0 alpha build?

Matty Krosschell commented

2021-07-23 02:33:40 +02:00

actually it appears the hole was caused by the first cut so unless you feel you can address that might as well close my report i failed you

Pratik Borhade commented

2021-07-23 11:10:48 +02:00

Added subscriber: @PratikPB2123

Pratik Borhade commented

2021-07-23 11:10:48 +02:00

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

Pratik Borhade closed this issue

2021-07-23 11:10:48 +02:00

Pratik Borhade commented

2021-07-23 11:10:48 +02:00

actually it appears the hole was caused by the first cut

checked the bug.blend file. Found the same thing: part of the cone mesh was removed initially.

so unless you feel you can address that might as well close my report I failed you

@matty686 , no problem. I will close the task. Thank you for the report :)

>actually it appears the hole was caused by the first cut checked the bug.blend file. Found the same thing: part of the cone mesh was removed initially. >so unless you feel you can address that might as well close my report I failed you @matty686 , no problem. I will close the task. Thank you for the report :)

Sign in to join this conversation.

No Label

Download

What's New

Blender Studio

Manual

Developers Blog

Documentation

Benchmark

Blender Conference

Development Fund

One-time Donations

Exact Boolean Modifyer Creates Missing Faces on Manifold Geometry #90024