Sculpt Mode Grab Tool Alt Key Crash #64
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Reference: Triager-bot/blender-bug-reports#64
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Original bug report: https://projects.blender.org/blender/blender/issues/157254
System Information
Operating system: Windows 11/ Windows 10
Graphics card:
Blender Version
5.1.0
Short description of error
Sculpt Mode Grab Tool Alt Key Crash
Exact steps for others to reproduce the error
Enter Sculpt Mode, select Grab tool and try it with alt - blender closes without any message.
Based on the default startup or an attached .blend file (as simple as possible).
Any .blend file.
Report is clear
LLM Reasoning
Got it, let's see. The bug report has a title, body with system info (but we ignore that), short description, and steps to reproduce. The steps are clear: enter Sculpt Mode, select Grab tool, use Alt key, blender crashes. So the text description is clear enough. So the answer should be Yes? Wait, wait. Let me check again. The question is if it clearly describes the issue. The title matches the short description and steps. The steps are straightforward. So yes, it's clear.
JSON Data
{
"llm_judgement": true,
"processing_time": 6.994082000000001
}
Report is specific
LLM Reasoning
Got it, let's analyze this bug report. The title is "Sculpt Mode Grab Tool Alt Key Crash". The body describes a specific scenario: entering Sculpt Mode, selecting the Grab tool, and using Alt key causes Blender to crash. The steps are exact—so it's about a specific issue (using Alt with Grab tool in Sculpt mode). So the answer should be 'Specific'.
JSON Data
{
"llm_judgement": true,
"processing_time": 5.846868000000001
}
Report flagged as NOT a duplicate by LLM
Sculpt mode crash
https://projects.blender.org/blender/blender/issues/152900
System Information
Operating system: Windows 10
Blender Version
Broken: blender-5.1.0-alpha+main.4153fd586bc6-windows.amd64-release
Worked: blender-5.1.0-alpha+main.4bfd728b797e-windows.amd64-release
Short description of error
Choosing any tool from the toolbar on the left in sculpt mode crashes blender
Exact steps for others to reproduce the error
Go to sculpt mode and choose any tool (not brushes) like box mask, mesh filter, transform tools etc, and it will crash
LLM Reasoning
Got it, let's analyze these two bug reports. First, look at the descriptions and steps.
Bug report 1: The issue is with the Grab Tool in Sculpt Mode when using Alt key—crashes Blender. Steps are enter Sculpt Mode, select Grab tool, use Alt, crash.
Bug report 2: The issue is choosing any tool (not brushes) in Sculpt Mode causes a crash. Steps are go to sculpt mode, choose any tool like box mask, mesh filter, transform tools, crash.
So the first one is specific to the Grab Tool with Alt key, the second is any non-brush tool. Are they the same? The triggers are different: one is Grab + Alt, the other is any tool (non-brush). So not duplicates. Therefore, answer is No.
JSON Data
{
"llm_judgement": false,
"processing_time": 9.819541,
"duplicate_report_number": "152900"
}
Report flagged as NOT a duplicate by LLM
Blender 5.1 - Random crash after attempting to mask with the ALT key in sculpt mode.
https://projects.blender.org/blender/blender/issues/156472
System Information
Operating system: Windows-10-10.0.19045-SP0 64 Bits
Graphics card: NVIDIA GeForce RTX 4080 SUPER/PCIe/SSE2 NVIDIA Corporation 4.6.0 NVIDIA 595.79 Opengl Backend
Blender Version
Broken: version: 5.1.0, branch: blender-v5.1-release, commit date: 2026-03-16 18:50, hash:
adfe2921d5f3Worked: All the previous versions
Short description of error
I encounter a crash randomly, but most often than not, when I am in sculpt mode and try to draw a mask. With ALT key, mainly but also had some crashes when I was selecting the dedicated brush.
Tried Vulkan or OpenGl, issue is the same.
I mainly sculpt on multires objects. Joined a txt crash file from Blender.
Exact steps for others to reproduce the error
When in sculpt mode, try to draw a mask with the ALT key, or using the standard mask brush.
LLM Reasoning
Got it, let's analyze these two bug reports. First, look at the descriptions and steps to reproduce.
Bug report 1: Title is "Sculpt Mode Grab Tool Alt Key Crash". Steps: Enter Sculpt Mode, select Grab tool, try with alt - blender crashes.
Bug report 2: Title mentions "Random crash after attempting to mask with ALT key in sculpt mode". Steps: In sculpt mode, draw a mask with ALT key or standard mask brush. Also mentions multires objects and random crashes but often with ALT in mask.
Now, check if the core issue is the same. Both involve Sculpt Mode and using the ALT key causing a crash. Report 1 is about Grab tool with alt, report 2 is about masking (mask brush) with alt. Are these related? The key here is whether the action (using alt in sculpt mode) leads to crash, regardless of the specific tool (grab vs mask). But wait, the steps are different: one is grab tool, the other is mask brush. However, both involve ALT key in Sculpt Mode leading to crash. But are they the same issue? Let's see.
Wait, the first report's steps: Grab tool + alt → crash. Second: Mask (with alt) or standard mask brush → crash. So different tools but same context (Sculpt Mode, ALT key). But are these considered the same bug? Maybe not, because the specific action (grab vs mask) is different. But let's check the descriptions. The first says "Grab Tool Alt Key Crash", second says "mask with ALT key". So the actions are different. Therefore, they might be different issues. Wait, but maybe the underlying cause is the same (ALT key in Sculpt Mode causing crash), but the specific tool used when it happens differs. However, the steps to reproduce are different: one uses Grab tool, the other uses mask brush. So are they duplicates? Let's think. If two bugs have different steps to reproduce (different tools) but similar symptoms, are they considered the same? The question is whether they are the same issue. Since the steps involve different tools (Grab vs Mask), maybe not. But let's check again.
Bug 1: Grab tool + alt → crash.
Bug 2: Mask (with alt) or standard mask brush → crash.
So the actions are different. Therefore, they might be separate issues. So the answer would be No? Wait, but maybe the ALT key in Sculpt Mode is the common factor. But the steps to reproduce are different. The question says focus on Description and Steps to Reproduce. Let's check:
Bug 1 description: "Sculpt Mode Grab Tool Alt Key Crash" → steps: Grab tool + alt.
Bug 2 description: "Random crash after attempting to mask with ALT key in sculpt mode" → steps: Mask with alt or standard mask brush.
So the core issue is using ALT in Sculpt Mode, but different tools. Are these considered the same? Maybe not, because the specific action (grab vs mask) is part of the reproduction steps. So they are not duplicates. Therefore, answer is No.
JSON Data
{
"llm_judgement": false,
"processing_time": 32.748374,
"duplicate_report_number": "156472"
}
Report flagged as NOT a duplicate by LLM
2.5 crashes when trying to get into sculpt mode on windows
https://projects.blender.org/blender/blender/issues/22336
%%%That's it the software just crashes just by clicking on sculpt mode%%%
LLM Reasoning
Got it, let's analyze these two bug reports. First, look at the descriptions and steps.
Bug report 1: The issue is in Sculpt Mode with the Grab tool when using Alt key—Blender crashes. Steps are enter Sculpt Mode, select Grab tool, use Alt, crash.
Bug report 2: The issue is Blender crashing just by clicking into Sculpt mode on Windows. No mention of the Grab tool or Alt key here; it's a general crash when entering Sculpt Mode.
So the first one is specific to Grab tool + Alt in Sculpt Mode, the second is any entry into Sculpt Mode causing crash. Different triggers and contexts. So they're not the same issue. Therefore, answer is No.
JSON Data
{
"llm_judgement": false,
"processing_time": 8.813375,
"duplicate_report_number": "22336"
}
Report flagged as NOT a duplicate by LLM
Crash upon holding ALT click to draw gradient weightpaint
https://projects.blender.org/blender/blender/issues/72908
System Information
Operating system: Windows-10-10.0.18362 64 Bits
Graphics card: GeForce GTX 1060 6GB/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 432.00
Blender Version
Broken: version: 2.81 (sub 16), branch: master, commit date: 2019-12-04 11:32, hash:
f1aa4d18d4Worked: (optional)
Short description of error
Crash upon holding ALT click to draw gradient weightpaint
Exact steps for others to reproduce the error
using character model
in weight paint mode, holding down the alt button and dragging on the forearm to do gradient weightpaint. Crashed the program
red.blend
LLM Reasoning
Got it, let's analyze these two bug reports. First, look at the descriptions and steps.
Bug Report 1: Sculpt Mode Grab Tool with Alt key causes crash. Steps: Enter Sculpt Mode, select Grab tool, use Alt—crash.
Bug Report 2: Weight Paint mode, holding Alt while dragging for gradient weightpaint causes crash. Steps: Weight paint mode, hold Alt, drag on forearm—crash.
The modes are different (Sculpt vs Weight Paint), and the tools/actions differ (Grab tool in Sculpt vs drawing gradient in Weight Paint). The common element is using Alt key, but the contexts are distinct. So they're not the same issue. Therefore, answer is No.
JSON Data
{
"llm_judgement": false,
"processing_time": 9.418444,
"duplicate_report_number": "72908"
}
Report flagged as NOT a duplicate by LLM
Blender close suddenly
https://projects.blender.org/blender/blender/issues/67421
System Information
Operating system: windows 10 pro
Graphics card: NVIDIA GeForce GTX 1060 6GB
Blender Version
Broken: (v 2.80, Release Candidate 2)
Worked: close suddenly
Blender closes
I'm in Sculpt, when I pressing TAB or SHIFT, ALT, it looks like it makes blender close
LLM Reasoning
Got it, let's analyze the two bug reports. First, look at the description and steps to reproduce.
Bug report 1: Title is "Sculpt Mode Grab Tool Alt Key Crash". Steps: Enter Sculpt Mode, select Grab tool, use Alt key—Blender closes.
Bug report 2: Title is "Blender close suddenly". Steps: In Sculpt mode, pressing TAB or SHIFT, ALT causes Blender to close. Wait, but the steps mention multiple keys (TAB, SHIFT, ALT), while bug 1 specifically mentions Grab tool with Alt. Also, bug 1's title specifies Grab Tool and Alt Key, whereas bug 2 is more general about closing when pressing those keys in Sculpt mode.
Wait, let's check the details. Bug 1's steps: "Enter Sculpt Mode, select Grab tool and try it with alt - blender closes". Bug 2: "I'm in Sculpt, when I pressing TAB or SHIFT, ALT, it looks like it makes blender close". So bug 1 is about Grab tool + Alt, bug 2 is about any of those keys (TAB, SHIFT, ALT) in Sculpt mode. Are they the same? The core issue is Blender closing in Sculpt mode with certain key presses, but bug 1 specifies Grab tool and Alt, bug 2 is more general. But maybe the underlying cause is similar? Wait, no—bug 1's steps are specific to Grab tool + Alt, while bug 2 includes other keys. So they might not be duplicates because the reproduction steps differ (one requires Grab tool, the other doesn't specify tool). Also, bug 2 mentions TAB and SHIFT too, which aren't in bug 1. So the answer is No? Wait, but maybe the user made a mistake. Let me check again.
Bug report 1: Steps are "Enter Sculpt Mode, select Grab tool and try it with alt". Bug report 2: "I'm in Sculpt, when I pressing TAB or SHIFT, ALT, it looks like it makes blender close". So bug 1 is specific to Grab tool + Alt, bug 2 is any of those keys (TAB, SHIFT, ALT) in Sculpt mode. So the reproduction steps are different—one requires selecting Grab tool, the other doesn't mention tool. Therefore, they are not the same issue. So answer is No.
JSON Data
{
"llm_judgement": false,
"processing_time": 24.419434000000003,
"duplicate_report_number": "67421"
}