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Maniphest T80548

Using Solidify with Boolean modifier closes hole / unexpected results
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Description

Using Solidify with boolean modifier closes hole / unexpected results

I'm using Blender 2.9, Ubuntu 18.04

I was testing the differences between 2.83 and 2.9 using the Solidify and Boolean modifier and found an issue with some objects.
I was following this video
https://youtu.be/qEtIACrEk-I?t=229

I tried to increase the Thickness value gradually and the hole closes up before I get to 0.2mm for thickness see test1.gif video / animation below


vokoscreen-2020-09-06_22-11-37.mkv448 KBDownload

I also tried Flipping normals but that prevents the bolt threads from increasing in size to 0.2mm see test2.gif video / animation below


vokoscreen-2020-09-06_22-15-33.mkv297 KBDownload

I've also attached the Blend file

issue1.blend1 MBDownload

Event Timeline

RT (Stillpointx) created this task.Sep 7 2020, 4:34 AM
RT (Stillpointx) added a project: Modifiers.
RT (Stillpointx) updated the task description. (Show Details)Sep 7 2020, 4:38 AM
RT (Stillpointx) updated the task description. (Show Details)
RT (Stillpointx) updated the task description. (Show Details)Sep 7 2020, 4:46 AM
Richard Antalik (ISS) changed the task status from Needs Triage to Needs Information from User.Sep 10 2020, 7:07 AM
Richard Antalik (ISS) added a subscriber: Richard Antalik (ISS).

Please download development build from https://builder.blender.org/download/ and use exact solver method on boolean modifier. Does that olve your issue?

RT (Stillpointx) added a comment.EditedSep 10 2020, 5:15 PM

The issue is still happening using the version you told me to try 2.91 alpha see animation / video attached / File

issue1.blend1 MBDownload

vokoscreen-2020-09-10_11-06-19.mkv317 KBDownload

It also has issues when I try it with flipped normals enabled see video / animation below

flipped normals 2020-09-10_11-20-04.mkv345 KBDownload

Amos Manneschmidt (amoose136) added a subscriber: Amos Manneschmidt (amoose136).EditedSep 10 2020, 8:38 PM

In both those gifs "mode" is still set to "simple." Try "Exact."

Amos Manneschmidt (amoose136) added a comment.Sep 10 2020, 9:43 PM

Note that exact calculation are considerably slower than simple floating point boolean operations and if the solidify modifier is producing a self intersecting mesh, you will also need to enable the "self" checkbox on the boolean or it still won't work. Enabling self intersections is also MUCH slower. Expect to wait like 15-30 seconds.

RT (Stillpointx) added a comment.Sep 10 2020, 10:53 PM

Thanks but I just found a bug with that to if I try and change the "Thickness" value more than twice It causes Blender 2.91.0 alpha to fully crash. But it is an Alpha

Richard Antalik (ISS) added a comment.Sep 11 2020, 1:06 AM
In T80548#1013334, @RT (Stillpointx) wrote:

Thanks but I just found a bug with that to if I try and change the "Thickness" value more than twice It causes Blender 2.91.0 alpha to fully crash. But it is an Alpha

Can you report crash? We need report for alpha versions too.

I forgot to say, that you also need to enable "Self" checkbox to allow self-intersections. That way this case woks for me pretty well. It's slow though, but it is a limitation.

RT (Stillpointx) added a comment.EditedSep 11 2020, 4:11 AM

Ok should I start / open another ticket for the crash? or just edit this one

Richard Antalik (ISS) added a comment.Sep 11 2020, 4:14 AM
In T80548#1013476, @RT (Stillpointx) wrote:

Ok should I start / open another ticket for the crash? or just edit this one

Open new report

Richard Antalik (ISS) closed this task as Archived.Oct 15 2020, 9:25 PM
Richard Antalik (ISS) claimed this task.

No activity for more than a week. As per the tracker policy we assume the issue is gone and can be closed.

Thanks again for the report. If the problem persists please open a new report with the required information.