Curve Hair Radius Setting Not Working After Initial Drawing #124
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Original bug report: https://projects.blender.org/blender/blender/issues/157211
System Information
Operating system: Windows 11 ProfessionalGraphics card: NVIDIA GeForce RTX 5080
Blender Version
Broken version: Blender 4.5.8 LTS (main branch, commit hash [d7359176d0]
Broken: 4.5.8
When drawing curve hair, if a radius value is set first for drawing, any new radius value set afterward will be ignored. This issue does not exist in Blender 5.1.
Report is clear
LLM Reasoning
Got it, let's see. The bug report has a clear title, and the body describes the issue: when drawing curve hair, setting a radius first then changing it later doesn't work. It also mentions that this isn't an issue in Blender 5.1. The steps to reproduce are implied (drawing curve hair with initial radius, then trying to change radius). So the description is clear. So the answer should be Yes.
JSON Data
{
"llm_judgement": true,
"processing_time": 5.886863
}
Report is specific
LLM Reasoning
Got it, let's analyze the bug report. The title is "Curve Hair Radius Setting Not Working After Initial Drawing". The body describes a specific scenario: when drawing curve hair, setting a radius first then changing it later doesn't work. It also mentions this issue isn't present in Blender 5.1. So this is about a specific feature (curve hair radius) and a specific behavior (radius not updating after initial draw). That's a specific issue, not generic. So the answer should be 'Specific'.
JSON Data
{
"llm_judgement": true,
"processing_time": 7.029364999999999
}
Report flagged as duplicate by LLM
setting a Curve Radius doesn't take in account already set Values
https://projects.blender.org/blender/blender/issues/21606
%%%way to reproduce:
edit a curve.
select a point.
W-key to have the special menu.
set Curve Radius.
put a radius of something like 5.3
repeat the Set Curve Radius command.
It resets to 1, instead of expected 5.3 as default value of the current point radius.
not 100% sure if it is a bug or feature?%%%
LLM Reasoning
Got it, let's analyze these two bug reports. First, look at the descriptions and steps to reproduce.
Bug report 1: The issue is that when drawing curve hair, after setting an initial radius, subsequent radius changes are ignored. So once you set a radius first, any new one doesn't take effect.
Bug report 2: When editing a curve, selecting a point, using W-key menu to set Curve Radius, then repeating the command resets to 1 instead of keeping the previous value (like 5.3). So here, when you try to set the radius again on the same point, it doesn't retain the previous value and defaults back.
Both are about curve radius settings not retaining or applying subsequent changes. The first is about drawing hair curves, the second about editing existing curve points, but the core issue is that after an initial radius setting, further attempts to change the radius don't work (either ignored or reset). So they seem to be the same underlying problem—radius value not persisting or being applied when trying to set it again. Therefore, they are duplicates.
JSON Data
{
"llm_judgement": true,
"processing_time": 12.554562,
"duplicate_report_number": "21606"
}
Report flagged as NOT a duplicate by LLM
Hair Curves: Set Curve Radius does not work with separate values for different curves; all get overridden by the first curve.
https://projects.blender.org/blender/blender/issues/106658
System Information
Operating system:Windows 10
Graphics card: nvidia rtx 2060 super
Blender Version
Broken: 3.5.0 release
Worked: none
Short description of error
Set curve radius overrides the radius of all curves with the first curve's radius it gets. For example, I separated the geometry into two groups, set radius for each one, and rejoined them with the join geometry node. The first group to be joined overrides the second one. I made a mask for selection, the second group is still overridden by the first. I made a value that differs by individual spline, all the splines are overriden by the value of the first spline. I do not believe this is the intended behavior as the "Selection" option would indicate it would leave something unchanged if not selected
Update: It seems this issue happens specifically in the viewport but not in the actual render in cycles. It's still a problem for previewing the different radius of the curves before the render though, and strange that all the values get overriden by one of them.
Exact steps for others to reproduce the error
Or open attached .blend file:
curves_join_radius__bug.blend
Example: Top group, large radius correct.
Example: Bottom group, small radius correct.
Example: Joined groups, large radius overrides the other group.
Example: Joined groups, small radius overrides the other group.
LLM Reasoning
Got it, let's analyze these two bug reports. First, look at the descriptions and steps.
Bug report 1 is about curve hair radius not working after initial drawing—so when you set a radius first, subsequent changes are ignored. The issue is in Blender 4.5.8, fixed in 5.1.
Bug report 2 is about setting curve radius overriding all curves with the first one's value, especially when joining geometry nodes or using splines. Steps involve splitting into groups, setting different radii, then joining, and the first group's radius overrides the second. Also mentions viewport vs render.
Now, check if they're the same issue. Bug 1 is about drawing curve hair (maybe in the sculpt mode or similar) where after initial radius, later changes don't apply. Bug 2 is about geometry nodes and joining groups, where the first group's radius overrides others. The contexts seem different: one is during drawing, the other is when combining via geometry nodes. So they might be different issues. Wait, but maybe the underlying problem is the same—radius not being applied correctly after some operation. But let's check the steps.
Bug 1: Drawing curve hair, set radius first, then new radius ignored. Bug 2: Split into groups, set radii, join, first overrides second. Are these related? Maybe not directly. The key is whether the core issue (radius not being applied correctly) is the same. But the scenarios are different—drawing vs geometry node joining. So probably not duplicates. Therefore, answer is No.
JSON Data
{
"llm_judgement": false,
"processing_time": 20.071133999999997,
"duplicate_report_number": "106658"
}
Report flagged as NOT a duplicate by LLM
Set Curve Radius node doesn't do anything
https://projects.blender.org/blender/blender/issues/144044
System Information
Operating system: macOS-15.5-arm64-arm-64bit 64 Bits
Graphics card: Metal API Apple M2 Max 1.2
Blender Version
Broken: version: 4.5.1 LTS, branch: blender-v4.5-release, commit date: 2025-07-29 05:31, hash:
b0a72b245dcfWorked: (newest version of Blender that worked as expected)
Short description of error
Set Curve Radius node in Geometry Nodes doesn't set curve radius no matter what value it has.
I've attached images where it produces expected results in 4.4.3 while it doesn't in 4.5.1.
I'm using Spline Parameter node to make it clear, but you can put any number and nothing changes.
LLM Reasoning
Got it, let's analyze the two bug reports. First, look at the description and steps for each.
Bug report 1 is about "Curve Hair Radius Setting Not Working After Initial Drawing". The issue is that when drawing curve hair, after setting an initial radius, subsequent radius changes are ignored. So this is related to drawing curve hair in a specific context (maybe sculpting or painting) where the radius doesn't update after the first draw.
Bug report 2 is about "Set Curve Radius node doesn't do anything" in Geometry Nodes. The problem here is that the Set Curve Radius node in Geometry Nodes fails to set the curve radius regardless of the value, and it worked in a previous version (4.4.3) but not in 4.5.1.
Now, check if these are the same issue. Bug report 1 is about drawing curve hair (maybe in a different context like sculpting) where radius changes after initial draw don't work. Bug report 2 is about a Geometry Nodes node that doesn't set radius. These seem to be different contexts: one is drawing curve hair (possibly in a non-Geometry Nodes context), the other is a Geometry Nodes node. So they are not the same issue. Therefore, the answer is No.
JSON Data
{
"llm_judgement": false,
"processing_time": 14.437507,
"duplicate_report_number": "144044"
}
Report flagged as NOT a duplicate by LLM
Geometry nodes Set Curve Radius doesn't work
https://projects.blender.org/blender/blender/issues/139736
System Information
Operating system: Windows-10-10.0.19045-SP0 64 Bits
Graphics card: NVIDIA GeForce RTX 3090 NVIDIA Corporation NVIDIA 572.83 Vulkan Backend
Blender Version
Broken: version: 4.5.0 Alpha, branch: main, commit date: 2025-06-01 14:30, hash:
492fa01eb388Worked: 4.4 afaik
Short description of error
Set Curve Radius doesn't seem to do anything in the current alpha.
Exact steps for others to reproduce the error
Add a Set Curve Radius to a curve and change the radius.
LLM Reasoning
Got it, let's analyze the two bug reports. First, look at the descriptions and steps to reproduce.
Bug Report 1: The issue is about curve hair radius setting not working after initial drawing. So when you set a radius first, subsequent changes are ignored. Steps involve drawing curve hair and changing radius afterward.
Bug Report 2: The issue is with Geometry nodes' Set Curve Radius node not working. Steps are adding the node to a curve and changing the radius, which doesn't do anything.
Now, check if they're the same. Bug 1 is about curve hair (maybe in sculpting or drawing mode) where radius changes after initial draw don't work. Bug 2 is about Geometry nodes' Set Curve Radius node not functioning. These are different contexts: one is curve hair drawing, the other is geometry nodes. So they're not the same issue. Therefore, the answer is No.
JSON Data
{
"llm_judgement": false,
"processing_time": 11.297080999999999,
"duplicate_report_number": "139736"
}
Report flagged as NOT a duplicate by LLM
Set radius curve in geo node is not functioning
https://projects.blender.org/blender/blender/issues/145125
System Information
Operating system: Windows-10-10.0.26100-SP0 64 Bits
Graphics card: NVIDIA GeForce GTX 1650/PCIe/SSE2 NVIDIA Corporation 4.6.0 NVIDIA 552.27 Opengl Backend
Blender Version
Broken: version: 4.5.0, branch: blender-v4.5-release, commit date: 2025-07-14 17:45, hash:
8cb6b388974aWorked: (newest version of Blender that worked as expected)
Short description of error
Spline parameter or the set curve radius is not showing any output in the geometry node.
Steps to reproduce the issue
I tried both Blender 4.5 LTS and 4.5.2 LTS version, i find the same problem.
Please look into it, Thank you....
LLM Reasoning
Got it, let's analyze these two bug reports. First, check the description and steps to reproduce.
Bug report 1 is about curve hair radius setting not working after initial drawing in Blender 4.5.8. The issue is that once a radius is set initially, subsequent changes are ignored. It's related to drawing curve hair (maybe in the sculpting or hair tools).
Bug report 2 is about the Set curve radius node in Geometry Nodes not functioning—changing the radius value doesn't affect output, even with Spline Parameter. This is in Geometry Nodes context, different from the first one which is about curve hair drawing.
So the contexts are different: one is curve hair drawing (maybe sculpt mode or hair tools), the other is Geometry Nodes' Set curve radius node. The steps and descriptions don't match. So they're not the same issue.
JSON Data
{
"llm_judgement": false,
"processing_time": 11.628048999999999,
"duplicate_report_number": "145125"
}