Painting on Color vs. Alpha Channel + "Affect Alpha" doesn't work as expected #87510

New Issue

Ori · 2021-04-15T06:15:12+02:00

Ori commented

2021-04-15 06:15:12 +02:00

System Information
Operating system: Windows 10
Graphics card: GTX 1080 Ti

Blender Version
Broken: 2.90, 2.92
Worked: N/A

Short description of error

Brush still affects alpha even if painting in Color channel and with "Affect Alpha" off.

Exact steps for others to reproduce the error
Based on the default startup or an attached .blend file (as simple as possible).

Alpha_testing.blend

**System Information** Operating system: Windows 10 Graphics card: GTX 1080 Ti **Blender Version** Broken: 2.90, 2.92 Worked: N/A **Short description of error** ![Blender_Alpha.jpg](https://archive.blender.org/developer/F9934095/Blender_Alpha.jpg) Brush still affects alpha even if painting in Color channel and with "Affect Alpha" off. **Exact steps for others to reproduce the error** Based on the default startup or an attached .blend file (as simple as possible). ![Alpha 02.png](https://archive.blender.org/developer/F9934100/Alpha_02.png) [Alpha_testing.blend](https://archive.blender.org/developer/F9934102/Alpha_testing.blend)

Ori commented

2021-04-15 06:15:12 +02:00

Added subscriber: @000wizard

Ori commented

2021-04-15 06:17:09 +02:00

Related?
https://developer.blender.org/T67665

Related? https://developer.blender.org/T67665

Philipp Oeser commented

2021-04-16 14:24:12 +02:00

Added subscriber: @lichtwerk

Philipp Oeser commented

2021-04-16 14:24:12 +02:00

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

Philipp Oeser commented

2021-04-16 14:24:12 +02:00

Are you painting in the Image Editor? Or 3DView?
[that setting is only effective in the 3DView]

Are you painting in the Image Editor? Or 3DView? [that setting is only effective in the 3DView]

Ori commented

2021-04-16 22:45:54 +02:00

In #87510#1147542, @lichtwerk wrote:
Are you painting in the Image Editor? Or 3DView?
[that setting is only effective in the 3DView]

You're right! "Affect Alpha" checkbox works properly when painting in 3D view. Thank you.

Still, it's really helpful to paint on the 2D texture sometimes (I can do it in PS, but faster to stay in Blender of course). Would be nice if it worked.

And the drop-down is confusing — that you can be on "Color" channel but it still paints alpha. Maybe this is more of a feature or UI clarification request, then?

> In #87510#1147542, @lichtwerk wrote: > Are you painting in the Image Editor? Or 3DView? > [that setting is only effective in the 3DView] You're right! "Affect Alpha" checkbox works properly when painting in 3D view. Thank you. Still, it's really helpful to paint on the 2D texture sometimes (I can do it in PS, but faster to stay in Blender of course). Would be nice if it worked. And the drop-down is confusing — that you can be on "Color" channel but it still paints alpha. Maybe this is more of a feature or UI clarification request, then?

Ankit Meel commented

2021-04-28 15:25:28 +02:00

Added subscriber: @ankitm

Ankit Meel commented

2021-04-28 15:25:28 +02:00

And the drop-down is confusing — that you can be on "Color" channel but it still paints alpha. Maybe this is more of a feature or UI clarification request, then?

Could you update the description to a documentation/UI change ?

>And the drop-down is confusing — that you can be on "Color" channel but it still paints alpha. Maybe this is more of a feature or UI clarification request, then? Could you update the description to a documentation/UI change ?

Philipp Oeser commented

2021-05-07 15:00:28 +02:00

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

Philipp Oeser closed this issue

2021-05-07 15:00:28 +02:00

Philipp Oeser commented

2021-05-07 15:00:28 +02:00

This is not optimal, agree (fully agree on the fact it would useful in 2D as well).

It is not that this is not mentioned in the documentation though:
https://docs.blender.org/manual/en/dev/sculpt_paint/texture_paint/tool_settings/brush_settings.html#advanced

The dropdown can be misleading as well, but this would need a proper design first [in that: how should these buttons behave exactly when painting with that option ON].
So in essence, I would suggest this to be discussed elsewhere, since the issue reported here is a request for modified/improved behavior and not a bug in current behavior.
Will archive since this tracker is only for bugs and errors.

For user requests and feedback, please use other channels: https://wiki.blender.org/wiki/Communication/Contact#User_Feedback_and_Requests
For more information on why this isn't considered a bug, visit: https://wiki.blender.org/wiki/Reference/Not_a_bug

This is not optimal, agree (fully agree on the fact it would useful in 2D as well). It is not that this is not mentioned in the documentation though: https://docs.blender.org/manual/en/dev/sculpt_paint/texture_paint/tool_settings/brush_settings.html#advanced The dropdown can be misleading as well, but this would need a proper design first [in that: how should these buttons behave exactly when painting with that option ON]. So in essence, I would suggest this to be discussed elsewhere, since the issue reported here is a request for modified/improved behavior and not a bug in current behavior. Will archive since this tracker is only for bugs and errors. For user requests and feedback, please use other channels: https://wiki.blender.org/wiki/Communication/Contact#User_Feedback_and_Requests For more information on why this isn't considered a bug, visit: https://wiki.blender.org/wiki/Reference/Not_a_bug

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Painting on Color vs. Alpha Channel + "Affect Alpha" doesn't work as expected #87510