Hair Particle Cut tool does not preserve relative control point position along hair particle lengths #102851

New Issue

s12a · 2022-11-29T15:06:13+01:00

s12a commented

2022-11-29 15:06:13 +01:00

System Information
Operating system: Windows-10-10.0.22621-SP0 64 Bits
Graphics card: Radeon (TM) RX 480 Graphics ATI Technologies Inc. 4.5.0 Core Profile Context 22.11.1.221110

Blender Version
Broken: version: 3.5.0 Alpha, branch: master, commit date: 2022-11-28 23:04, hash: 3d1594417b

Short description of error
When using the Cut tool in Particle Edit mode for Particle Hair Systems, dragging the tool while holding LMB can deleteriously reorganize hair particle control points, in particular when they are not homogeneously placed along the particle length.

In other words: the relative position of control points along hair particle lengths may not be retained after using the Cut tool.

Exact steps for others to reproduce the error
A sample scene with default Blender settings has been provided.

With the selected Cut tool hold LMB and drag down slowly the cursor along the particle lengths.
Observe how the control points get shuffled along the hair particle lengths.

hair-cp-cut.blend

Visual results
Before using the Cut tool:

After using the Cut tool:

**System Information** Operating system: Windows-10-10.0.22621-SP0 64 Bits Graphics card: Radeon (TM) RX 480 Graphics ATI Technologies Inc. 4.5.0 Core Profile Context 22.11.1.221110 **Blender Version** Broken: version: 3.5.0 Alpha, branch: master, commit date: 2022-11-28 23:04, hash: `3d1594417b` **Short description of error** When using the Cut tool in Particle Edit mode for Particle Hair Systems, dragging the tool while holding `LMB` can deleteriously reorganize hair particle control points, in particular when they are not homogeneously placed along the particle length. In other words: the relative position of control points along hair particle lengths may not be retained after using the Cut tool. **Exact steps for others to reproduce the error** A sample scene with default Blender settings has been provided. - With the selected Cut tool hold `LMB` and _drag_ down slowly the cursor along the particle lengths. - Observe how the control points get shuffled along the hair particle lengths. [hair-cp-cut.blend](https://archive.blender.org/developer/F13978933/hair-cp-cut.blend) **Visual results** Before using the Cut tool: ![image.png](https://archive.blender.org/developer/F13978942/image.png) After using the Cut tool: ![image.png](https://archive.blender.org/developer/F13978948/image.png)

s12a commented

2022-11-29 15:06:13 +01:00

Added subscriber: @s12a

s12a commented

2022-11-29 15:31:04 +01:00

Probably related to or a duplicate of https://developer.blender.org/T62993

Hans Goudey commented

2022-11-29 16:35:07 +01:00

Closed as duplicate of #62993

Hans Goudey closed this issue

2022-11-29 16:35:07 +01:00

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Hair Particle Cut tool does not preserve relative control point position along hair particle lengths #102851