soften brush not working in UV editor for texturing #63233

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Daniel Ulrich · 2019-04-03T00:44:24+02:00

Daniel Ulrich commented

2019-04-03 00:44:24 +02:00

System Information
Operating system: Kubuntu 16.04
Graphics card: GTX 1070

Blender Version
Broken: (example: 2.80,b936d7b16c62, master, 2019-03-31, as found on the splash screen)

Short description of error

soften brush not working in UV view for texturing

Exact steps for others to reproduce the error

create cube
go to texture paint workspace
create a default 1024*1024 texture
create material for cube, connect the image texture created to base color
texture won't update in texture workspace unless switching to a different workspace and back, this might be another bug.
paint a stroke in UV view
try to use soften brush. works in 3D view but not in UV view (smear and draw seem to work fine. On an unrelated note, Soften seems to be veeery slow even in the viewport)

**System Information** Operating system: Kubuntu 16.04 Graphics card: GTX 1070 **Blender Version** Broken: (example: 2.80,b936d7b16c62, master, 2019-03-31, as found on the splash screen) **Short description of error** soften brush not working in UV view for texturing **Exact steps for others to reproduce the error** - create cube - go to texture paint workspace - create a default 1024*1024 texture - create material for cube, connect the image texture created to base color - *texture won't update in texture workspace unless switching to a different workspace and back, this might be another bug.* - paint a stroke in UV view - try to use soften brush. works in 3D view but not in UV view (smear and draw seem to work fine. On an unrelated note, Soften seems to be veeery slow even in the viewport)

Daniel Ulrich commented

2019-04-03 00:44:24 +02:00

Added subscriber: @dan2

Sebastian Parborg commented

2019-04-03 12:10:14 +02:00

Added subscribers: @brecht, @ZedDB

Brecht Van Lommel was assigned by Sebastian Parborg

2019-04-03 12:10:14 +02:00

Sebastian Parborg commented

2019-04-03 12:10:14 +02:00

The brush does work, but the result is so subtle that it is barely unnoticeable in the UV viewport. It seems to be a very big discrepancy between the brush influence in the UV editor and the 3D viewport.

@brecht feel free to reassign if this is not for you.

The brush does work, but the result is so subtle that it is barely unnoticeable in the UV viewport. It seems to be a very big discrepancy between the brush influence in the UV editor and the 3D viewport. @brecht feel free to reassign if this is not for you.

Jacques Lucke commented

2019-04-03 12:35:00 +02:00

Added subscriber: @JacquesLucke

Jacques Lucke commented

2019-04-03 12:35:00 +02:00

Looks like there is something wrong with the weights for each pixel, checking that.

Brecht Van Lommel removed their assignment 2019-04-03 12:36:36 +02:00

Jacques Lucke was assigned by Brecht Van Lommel

2019-04-03 12:36:36 +02:00

Jacques Lucke commented

2019-04-03 13:43:17 +02:00

Added subscriber: @WilliamReynish

Jacques Lucke commented

2019-04-03 13:43:17 +02:00

Ok, took me a while to kind-of understand the data flow when painting on images.
Everything seems to work as expected.

The main problem is that the default Brush -> Kernel Radius is 1. This leads to the following kernel matrix used for softening.

0.000123 0.011109 0.000123
0.011109 1.000000 0.011109
0.000123 0.011109 0.000123

This matrix does almost nothing. Furthermore, the effect is decreased even more by the default strength of 0.2.

I suggest we do one of the following things:

Set the default blur mode to Box instead of Gaussian.
Set the default kernel radius to 2.
Implement another blur mode, that is a mix between Box and Gaussian, so that it is more useful when the kernel radius is 1.

Ok, took me a while to kind-of understand the data flow when painting on images. Everything seems to work as expected. The main problem is that the default `Brush -> Kernel Radius` is 1. This leads to the following kernel matrix used for softening. ``` 0.000123 0.011109 0.000123 0.011109 1.000000 0.011109 0.000123 0.011109 0.000123 ``` This matrix does almost nothing. Furthermore, the effect is decreased even more by the default strength of `0.2`. I suggest we do one of the following things: - Set the default blur mode to `Box` instead of `Gaussian`. - Set the default kernel radius to `2`. - Implement another blur mode, that is a mix between `Box` and `Gaussian`, so that it is more useful when the kernel radius is `1`.

William Reynish commented

2019-04-03 13:46:49 +02:00

Added subscriber: @ideasman42

William Reynish commented

2019-04-03 13:46:49 +02:00

What if we just set the default strength to 1?

I'm not familiar enough with the logic of how the blur tool works internally to comment on how the kernel radius should work. I think @ideasman42 has done some work in the area of painting - looping him in.

What if we just set the default strength to 1? I'm not familiar enough with the logic of how the blur tool works internally to comment on how the kernel radius should work. I think @ideasman42 has done some work in the area of painting - looping him in.

Sebastian Parborg commented

2019-04-03 14:07:54 +02:00

Even with a strength of 1, the brush doesn't really do anything in the UV editor. In the viewport however, it will blur the texture heavily.

William Reynish commented

2019-04-03 14:40:59 +02:00

@ZedDB Ok, yes, I see. @JacquesLucke's suggestion is probably a good one, I just don't want to comment on the exact logic specifically.

blender-admin commented

2019-04-23 12:31:37 +02:00

This issue was referenced by c043ab1cf3

This issue was referenced by c043ab1cf3bce77248a8d7dfa42b2e9f8f9611aa

Jacques Lucke commented

2019-04-23 12:34:25 +02:00

Changed status from 'Open' to: 'Resolved'

Jacques Lucke closed this issue

2019-04-23 12:34:25 +02:00

Aditya V. T. commented

2022-01-14 23:24:41 +01:00

Added subscriber: @Rubium

Morgane commented

2022-12-18 19:34:14 +01:00

Added subscriber: @Morgane-DANO

Morgane commented

2022-12-18 19:34:14 +01:00

Hi,
Don't know if it will help, but I had issues with the blur brush as you all, I could make it right by changing the stroke method from space to airbrush.

Hi, Don't know if it will help, but I had issues with the blur brush as you all, I could make it right by changing the stroke method from space to airbrush.

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soften brush not working in UV editor for texturing #63233