Clay strips brush freeze when coming from outside the horizon of surface curvature #99642

New Issue

Tonatiuh de San Julián · 2022-07-12T15:42:10+02:00

2022-07-12 15:42:10 +02:00

System Information
Operating system: Linux-5.4.0-121-generic-x86_64-with-glibc2.31 64 Bits
Graphics card: GeForce GTX 670MX/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 390.151

Blender Version
Broken: version: 3.2.1, branch: master, commit date: 2022-07-05 15:44, hash: a2d59b2dac
Worked: (newest version of Blender that worked as expected)

Short description of error
Clay strips brush freeze when reaching horizon of surface curvature

Exact steps for others to reproduce the error
Open blender, then open a new sculpt file, select the clay strips brush, change the direction of the effect to subtract and change the space distance to scene and disable the adjust strength for spacing.
When coming from outside the object blender freezes or lags creating sometimes artefacts in the horizon of the object.

In this video you can see the normal behaviour with view spacing distance and with scene spacing distance wile adjust strength for spacing is enable, and then the buggy behaviour.

vokoscreen-2022-07-12_15-29-16.mp4

**System Information** Operating system: Linux-5.4.0-121-generic-x86_64-with-glibc2.31 64 Bits Graphics card: GeForce GTX 670MX/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 390.151 **Blender Version** Broken: version: 3.2.1, branch: master, commit date: 2022-07-05 15:44, hash: `a2d59b2dac` Worked: (newest version of Blender that worked as expected) **Short description of error** Clay strips brush freeze when reaching horizon of surface curvature **Exact steps for others to reproduce the error** Open blender, then open a new sculpt file, select the clay strips brush, change the direction of the effect to subtract and change the space distance to scene and disable the adjust strength for spacing. When coming from outside the object blender freezes or lags creating sometimes artefacts in the horizon of the object. In this video you can see the normal behaviour with view spacing distance and with scene spacing distance wile adjust strength for spacing is enable, and then the buggy behaviour. [vokoscreen-2022-07-12_15-29-16.mp4](https://archive.blender.org/developer/F13288818/vokoscreen-2022-07-12_15-29-16.mp4)

Tonatiuh de San Julián commented

2022-07-12 15:42:10 +02:00

Added subscriber: @TonatiuhdeSanJulian

Julien Kaspar commented

2022-07-12 15:55:39 +02:00

Added subscriber: @JulienKaspar

Julien Kaspar commented

2022-07-12 15:55:39 +02:00

Changed status from 'Needs Triage' to: 'Confirmed'

Julien Kaspar commented

2022-07-12 15:55:39 +02:00

I can confirm this. This seems related to #98111, but I think it makes sense to keep the bug reports separate for now until we investigate this further.
This issue is specifically about the poor performance and freezes when reaching the horizon of the surface curvature,
while #98111 is more about the brush artefacts specifically in the Draw Sharp. brush.

I can confirm this. This seems related to #98111, but I think it makes sense to keep the bug reports separate for now until we investigate this further. This issue is specifically about the poor performance and freezes when reaching the horizon of the surface curvature, while #98111 is more about the brush artefacts specifically in the Draw Sharp. brush.

Julien Kaspar changed title from ~~Clay strips brush freeze when rcoming from outside the horizon of surface curvature~~ to Clay strips brush freeze when coming from outside the horizon of surface curvature

2022-07-12 15:58:25 +02:00

Julien Kaspar commented

2022-07-14 15:31:34 +02:00

This might be something that is an issue for every brush when using scene space distance.

2022-07-14 15-27-13.mp4
In this video you can see the difference of how much the stroke accumulates when reaching the horizon of the surface curvature of the current or overlapping surfaces.
This might be a root cause of the bug and related performance & artefact issues.

This might be something that is an issue for every brush when using scene space distance. [2022-07-14 15-27-13.mp4](https://archive.blender.org/developer/F13292431/2022-07-14_15-27-13.mp4) In this video you can see the difference of how much the stroke accumulates when reaching the horizon of the surface curvature of the current or overlapping surfaces. This might be a root cause of the bug and related performance & artefact issues.

Tonatiuh de San Julián commented

2022-07-16 10:43:23 +02:00

@JulienKaspar Can it be that it doesn't know if you are going to follow the curvature to the back or the front? In https://developer.blender.org/T98111 I added a videos that shows that activating front faces only improves the behavior a lot.

Philipp Oeser removed the

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Clay strips brush freeze when coming from outside the horizon of surface curvature #99642