Sculpt: Tip Roundness ignored in Clay Strips Brush when Hardness set to 1 OR Falloff set to Constant #128004

New Issue

Nicola-Dessi · 2024-09-23T05:40:43+02:00

Nicola-Dessi commented

2024-09-23 05:40:43 +02:00

System Information
Operating system: Windows-10-10.0.19042-SP0 64 Bits
Graphics card: NVIDIA GeForce RTX 2070/PCIe/SSE2 NVIDIA Corporation 4.6.0 NVIDIA 526.98

Blender Version
Broken: version: 4.3.0 Alpha, branch: main, commit date: 2024-09-22 23:31, hash: a34b0e17d624
Worked: ? Works as expected in current 4.2 LTS

Short description of error
When sculpting with clay strips, tip roundness is ignored and behaves as if it was set to 0 when one of the following is true:

Hardness is set to 1. (Works correctly when set to any value below 1, such as 0.99)
Falloff is set to costant. (Works as expected when using a custom falloff with a hand-drawn constant curve.)

Exact steps for others to reproduce the error

Add a 100x100 grid
Enter sculpt mode
To make the problem obvious, use the clay strip brush with:

hardness: 1;
tip roundness: 1;
strength: 3;
stroke: anchored;
falloff: smoother

A brush stroke will result in a cubic shape instead of the expected cylindrical shape
Now set hardness to 0 and falloff to costant
Again, a brush stroke will result in a cubic shape instead of the expected cylindrical shape

**System Information** Operating system: Windows-10-10.0.19042-SP0 64 Bits Graphics card: NVIDIA GeForce RTX 2070/PCIe/SSE2 NVIDIA Corporation 4.6.0 NVIDIA 526.98 **Blender Version** Broken: version: 4.3.0 Alpha, branch: main, commit date: 2024-09-22 23:31, hash: `a34b0e17d624` Worked: ? Works as expected in current 4.2 LTS **Short description of error** When sculpting with clay strips, tip roundness is ignored and behaves as if it was set to 0 when one of the following is true: - Hardness is set to 1. (Works correctly when set to any value below 1, such as 0.99) - Falloff is set to costant. (Works as expected when using a custom falloff with a hand-drawn constant curve.) **Exact steps for others to reproduce the error** 1. Add a 100x100 grid 2. Enter sculpt mode 3. To make the problem obvious, use the clay strip brush with: - hardness: 1; - tip roundness: 1; - strength: 3; - stroke: anchored; - falloff: smoother 4. A brush stroke will result in a cubic shape instead of the expected cylindrical shape 5. Now set hardness to 0 and falloff to costant 6. Again, a brush stroke will result in a cubic shape instead of the expected cylindrical shape

Nicola-Dessi added the

labels 2024-09-23 05:40:44 +02:00

Richard Antalik commented

2024-09-23 20:30:57 +02:00

Not sure if this is a bug. @Sean-Kim Can you check?

Nicola-Dessi commented

2024-09-23 20:47:53 +02:00

Not sure if this is a bug.

That's how it works in 4.2 LTS. It makes sense because otherwise:

For the hardness part of the issue, the brush stroke would have a cylindrical shape when hardness is at 0.99, and a cubic one when set at 1, creating a huge discontinuity.
For the custom falloff, hand-drawing a constant curve would behave differently than using a constant falloff, which would be quite weird.

> Not sure if this is a bug. That's how it works in 4.2 LTS. It makes sense because otherwise: - For the hardness part of the issue, the brush stroke would have a cylindrical shape when hardness is at 0.99, and a cubic one when set at 1, creating a huge discontinuity. - For the custom falloff, hand-drawing a constant curve would behave differently than using a constant falloff, which would be quite weird.

Richard Antalik commented

2024-09-23 21:04:24 +02:00

Not sure if this is a bug.

That's how it works in 4.2 LTS. It makes sense because otherwise:

For the hardness part of the issue, the brush stroke would have a cylindrical shape when hardness is at 0.99, and a cubic one when set at 1, creating a huge discontinuity.

For the custom falloff, hand-drawing a constant curve would behave differently than using a constant falloff, which would be quite weird.

Can not reproduce either of these claims. But I am not very knowledgable in this area, so would deffer this anyway

> > Not sure if this is a bug. > > That's how it works in 4.2 LTS. It makes sense because otherwise: > - For the hardness part of the issue, the brush stroke would have a cylindrical shape when hardness is at 0.99, and a cubic one when set at 1, creating a huge discontinuity. > - For the custom falloff, hand-drawing a constant curve would behave differently than using a constant falloff, which would be quite weird. > > Can not reproduce either of these claims. But I am not very knowledgable in this area, so would deffer this anyway

Pratik Borhade commented

2024-09-24 06:48:54 +02:00

Hi, thanks for the report. Can confirm the difference between 4.2 and 4.3