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Add Hair Tool: with 'interpolation' and 'b-spline' enabled, added hair gets shorter and shorter
Closed, InvalidPublicKNOWN ISSUE

Description

System Information
Operating system: Windows-10-10.0.18362 64 Bits
Graphics card: GeForce GTX 1070/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 430.86

Blender Version
Broken: version: 2.80 (sub 75), branch: master, commit date: 2019-07-29 14:47, hash: rBf6cb5f54494e
Also broken: 2.70a - 2.79b (didn't test with older versions)

Short description of error
When B-spline rendering and interpolate option of the add hair tool are enabled, the added hair get shorter as you drag the brush.

Exact steps for others to reproduce the error

Add a hair system with 1 particle
Turn on B-spline
Go to particle edit mode, choose add hair and turn on Interpolate
Click and drag on the mesh.

Event Timeline

Philipp Oeser (lichtwerk) lowered the priority of this task from 90 to 50.Sep 9 2019, 3:40 PM

Can confirm this. (was not the case in 2.79)

Philipp Oeser (lichtwerk) renamed this task from add hair tool with interpolation break when b-spline is enabled to Add Hair Tool: with 'interpolation' and 'b-spline' enabled, added hair gets shorter and shorter.Sep 9 2019, 3:42 PM

Can confirm this. (was not the case in 2.79)

correction: with b-spline, this was also the case in 2.79...

Sybren A. Stüvel (sybren) claimed this task.
Sybren A. Stüvel (sybren) updated the task description. (Show Details)
Sybren A. Stüvel (sybren) changed the subtype of this task from "Report" to "Known Issue".

I'm closing this as a Known Issue, as the particle system has been marked 'End of Life', and this issue has been in Blender long before 2.80 -- I reproduced it even with Blender 2.70a.