Stroke overlay when erasing #66479

New Issue

xanadou · 2019-07-05T19:14:44+02:00

xanadou commented

2019-07-05 19:14:44 +02:00

System Information
Operating system: Win 10
Graphics card: NVIDIA GeForce GTX 1070 Ti

Blender Version
Broken: (example: 2.80, 66684bdff3, master, 2019-07-05)

Short description of error

The new alpha overlap stops working, when you erase somethin of that stroke.

Exact steps for others to reproduce the error

Open a new project create a blank stroke object draw something try to erase it

**System Information** Operating system: Win 10 Graphics card: NVIDIA GeForce GTX 1070 Ti **Blender Version** Broken: (example: 2.80, 66684bdff30f, master, 2019-07-05) **Short description of error** The new alpha overlap stops working, when you erase somethin of that stroke. **Exact steps for others to reproduce the error** Open a new project create a blank stroke object draw something try to erase it

xanadou commented

2019-07-05 19:14:44 +02:00

Added subscriber: @xanadou

Ilari Männistö commented

2019-07-08 19:15:44 +02:00

Added subscriber: @Lattapotta

Ilari Männistö commented

2019-07-08 19:15:44 +02:00

Yea, this is what happens when I test it.

![image.png](https://archive.blender.org/developer/F7577332/image.png) Yea, this is what happens when I test it.

Sebastian Parborg commented

2019-07-09 18:00:11 +02:00

Added subscribers: @antoniov, @ZedDB

Antonio Vazquez was assigned by Sebastian Parborg

2019-07-09 18:00:11 +02:00

Sebastian Parborg commented

2019-07-09 18:00:11 +02:00

@antoniov is this something fixable?

Antonio Vazquez commented

2019-07-09 18:02:29 +02:00

Not now.... because there are more implications.... hide points needs more things that a simple change and hide strokes need to change in the draw manager also and maybe in a lot of places, so it's something cannot be changed easily..it's possible, but need a redesign of several areas.

Antonio Vazquez was unassigned by Dalai Felinto

2019-12-23 16:33:55 +01:00

Richard Antalik commented

2020-02-05 12:29:53 +01:00

Added subscriber: @iss

Richard Antalik commented

2020-02-05 12:29:53 +01:00

Changed status from 'Confirmed' to: 'Needs User Info'

Richard Antalik commented

2020-02-05 12:29:53 +01:00

I have re-triaged this report and can not reproduce it.
Can you please check if this is still an issue in latest build?
https://builder.blender.org/download/

I have re-triaged this report and can not reproduce it. Can you please check if this is still an issue in latest build? https://builder.blender.org/download/

Philipp Oeser commented

2020-02-05 15:45:13 +01:00

Added subscriber: @lichtwerk

Philipp Oeser commented

2020-02-05 15:45:13 +01:00

Changed status from 'Needs User Info' to: 'Confirmed'

Philipp Oeser commented

2020-02-05 15:45:13 +01:00

I can still reproduce:

before Eraser:

after Eraser:

@antoniov: is this something that also goes away in the greasepencil-refactor branch?
(confirming for now, since it is still an issue in master...)

I can still reproduce: before Eraser: ![image.png](https://archive.blender.org/developer/F8323521/image.png) after Eraser: ![image.png](https://archive.blender.org/developer/F8323523/image.png) @antoniov: is this something that also goes away in the greasepencil-refactor branch? (confirming for now, since it is still an issue in master...)

Antonio Vazquez commented

2020-02-05 16:12:30 +01:00

Added subscribers: @fclem, @mendio, @pepe-school-land

Antonio Vazquez commented

2020-02-05 16:12:30 +01:00

I have tested and this is something we cannot fix, because is not a "real" error. We could change how works the eraser, but it's something we need to think before the pros and cons.

The reason for the change is how the strokes are overlapped by stencil. When you start to draw, you draw only one stroke, so the stencil is applied (always works by stoke), so any overlapping is removed.

When you start to erase, first the strength of the stroke is reduced, but when you get a threshold, the point is removed and the stroke is cut in pieces, In this moment, you have more than one stroke and the effect is as if you had several strokes one on top of others. As the opacity is not 1.0, you get the overlapping effect, and this is normal.

To fix this, we would have to add an option in the eraser to keep the "invisible" points, but then the eraser could never remove points and will produce "invisible strokes", so if we fix this, we break other areas.

@mendio @pepe-school-land @fclem Any idea here?

I have tested and this is something we cannot fix, because is not a "real" error. We could change how works the eraser, but it's something we need to think before the pros and cons. The reason for the change is how the strokes are overlapped by stencil. When you start to draw, you draw only one stroke, so the stencil is applied (always works by stoke), so any overlapping is removed. ![image.png](https://archive.blender.org/developer/F8323569/image.png) When you start to erase, first the strength of the stroke is reduced, but when you get a threshold, the point is removed and the stroke is cut in pieces, In this moment, you have more than one stroke and the effect is as if you had several strokes one on top of others. As the opacity is not 1.0, you get the overlapping effect, and this is normal. ![image.png](https://archive.blender.org/developer/F8323571/image.png) To fix this, we would have to add an option in the eraser to keep the "invisible" points, but then the eraser could never remove points and will produce "invisible strokes", so if we fix this, we break other areas. @mendio @pepe-school-land @fclem Any idea here?

Antonio Vazquez commented

2020-05-11 15:36:14 +02:00

@lichtwerk As this report is something that cannot be fixed without breaking other things... is it good to keep as know issue or just close it?

Philipp Oeser commented

2020-05-11 16:14:49 +02:00

Added subscriber: @dfelinto

Philipp Oeser commented

2020-05-11 16:14:49 +02:00

A Known Issue can be closed if this is a Architecture/Design limitation that wont be fixed.
https://code.blender.org/wp-content/uploads/2019/12/flow-chart-ish-6-months.png

However, if this is something that might be worked on [just not in the forseeable future of lets say two releases], than I guess it should stay open?

Tbh, I would like the opinion of @dfelinto here (since it was never 100% clear to me as well)

A Known Issue can be closed if this is a Architecture/Design limitation that wont be fixed. https://code.blender.org/wp-content/uploads/2019/12/flow-chart-ish-6-months.png However, if this is something that might be worked on [just not in the forseeable future of lets say two releases], than I guess it should stay open? Tbh, I would like the opinion of @dfelinto here (since it was never 100% clear to me as well)

Antonio Vazquez commented

2020-05-14 10:41:36 +02:00

As this is a design limitation, we are going to add an explanation of the limitation in the manual.

@mendio when you can , please add a cooment in the manual. Contact with me if you need a detailed explanation of the problem and why cannot be fixed with the current design without breaking more things.

As this is a design limitation, we are going to add an explanation of the limitation in the manual. @mendio when you can , please add a cooment in the manual. Contact with me if you need a detailed explanation of the problem and why cannot be fixed with the current design without breaking more things.

Philipp Oeser removed the

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Stroke overlay when erasing #66479