Painted area blinks in Weight Paint mode when the mesh is rigged (Blender 2.8.0 RC 1) #66811

New Issue

Kei Muratagawa · 2019-07-12T22:40:21+02:00

Kei Muratagawa commented

2019-07-12 22:40:21 +02:00

System Information
Operating system: Windows-10-10.0.17763 64 Bits
Graphics card: GeForce GTX 970/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 430.39

Blender Version
Broken: version: 2.80 (sub 74), branch: master, commit date: 2019-07-11 13:50, hash: 06312c6d2d
Worked: (optional)

Short description of error

blinking_in_weight_paint.mp4

When a mesh has vertex groups and is rigged, I can't paint the vertex group in Weight Paint mode.

While dragging the cursor, the painted area just blinks and has no effect.

Exact steps for others to reproduce the error

Dance_Robot_001.blend

Select the rigged mesh and choose an vertex group
Go to Weight Paint mode

Just paint with any brush (and take no effect)

**System Information** Operating system: Windows-10-10.0.17763 64 Bits Graphics card: GeForce GTX 970/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 430.39 **Blender Version** Broken: version: 2.80 (sub 74), branch: master, commit date: 2019-07-11 13:50, hash: `06312c6d2d` Worked: (optional) **Short description of error** [blinking_in_weight_paint.mp4](https://archive.blender.org/developer/F7603932/blinking_in_weight_paint.mp4) When a mesh has vertex groups and is rigged, I can't paint the vertex group in Weight Paint mode. While dragging the cursor, the painted area just blinks and has no effect. **Exact steps for others to reproduce the error** [Dance_Robot_001.blend](https://archive.blender.org/developer/F7603947/Dance_Robot_001.blend) - Select the rigged mesh and choose an vertex group - Go to Weight Paint mode # Just paint with any brush (and take no effect)

Kei Muratagawa commented

2019-07-12 22:40:22 +02:00

Added subscriber: @muratagawa

Kei Muratagawa changed title from ~~Painted area blinks and cannot paint in Weight Paint mode when the mesh is rigged (Blender 2.8 RC 1)~~ to Painted area blinks and cannot paint in Weight Paint mode when the mesh is rigged (Blender 2.8.0 RC 1)

2019-07-12 22:41:19 +02:00

Philipp Oeser commented

2019-07-14 19:21:40 +02:00

Added subscribers: @Jeroen-Bakker, @lichtwerk

Jeroen Bakker was assigned by Philipp Oeser

2019-07-14 19:21:40 +02:00

Philipp Oeser commented

2019-07-14 19:21:40 +02:00

Two issues that I see here:
(1) you have vertex selection masking for painting turned ON {F7608477}
This will restrict the influence of your strokes to selected vertices, you can either select more vertices [the ones in the leg], or disable this option alltogether.
This one is not a bug.

(2) the flickering in your file is somehow caused by screen space reflections (this file is in lookdev viewport shading with weightpaint overlay)
This is not happening if screen space reflections are turned OFF.
This is not happening in solid viewport shading with weightpaint overlay.
If screen space reflections are turned on, pretty much everything (painting strokes, selecting vertex groups or bones, ...) will somehow invalidate the overlay and only orbiting/zooming the viewport will bring it back...
This one is a bug, and I would kindly ask @Jeroen-Bakker? to have a look (feel free to reassign if this is not for you...).

Two issues that I see here: **(1) you have `vertex selection masking for painting` turned ON {[F7608477](https://archive.blender.org/developer/F7608477/T66811.png)}** This will restrict the influence of your strokes to selected vertices, you can either select more vertices [the ones in the leg], or disable this option alltogether. This one is not a bug. **(2) the flickering in your file is somehow caused by screen space reflections (this file is in `lookdev` viewport shading with weightpaint overlay)** This is not happening if screen space reflections are turned OFF. This is not happening in `solid` viewport shading with weightpaint overlay. If screen space reflections are turned on, pretty much everything (painting strokes, selecting vertex groups or bones, ...) will somehow invalidate the overlay and only orbiting/zooming the viewport will bring it back... This one is a bug, and I would kindly ask @Jeroen-Bakker? to have a look (feel free to reassign if this is not for you...).

Philipp Oeser changed title from ~~Painted area blinks and cannot paint in Weight Paint mode when the mesh is rigged (Blender 2.8.0 RC 1)~~ to Painted area blinks in Weight Paint mode when the mesh is rigged (Blender 2.8.0 RC 1)

2019-07-14 19:22:05 +02:00

Kei Muratagawa commented

2019-07-15 02:02:33 +02:00

Thanks for your advice.
I have forgot "vertex selection masking" was turned on.

FYI, the second problem (flickering) doesn't occur in the former beta version. (I'm using 2.8.74 - (2019-07-05 06:13, hash: 66684bdff3))
I think it is a bug as you suggested.

Thanks for your advice. I have forgot "vertex selection masking" was turned on. FYI, the second problem (flickering) doesn't occur in the former beta version. (I'm using 2.8.74 - (2019-07-05 06:13, hash: `66684bdff3`)) I think it is a bug as you suggested.

Jeroen Bakker commented

2019-07-16 09:00:28 +02:00

Issue is introduced by 484794ce67
EEVEE now uses a 'warm-up' sample when SSR is enabled. In the viewport these were 2 samples... I added a patch for review that fixes this.

Issue is introduced by 484794ce67 EEVEE now uses a 'warm-up' sample when SSR is enabled. In the viewport these were 2 samples... I added a patch for review that fixes this.

Jeroen Bakker removed their assignment 2019-07-16 13:25:45 +02:00

Clément Foucault was assigned by Jeroen Bakker

2019-07-16 13:25:45 +02:00

Jeroen Bakker commented

2019-07-16 13:25:45 +02:00

Added subscriber: @fclem

Jeroen Bakker commented

2019-07-16 13:25:45 +02:00

We have researched in more depth.

TAA will make a copy of the depth buffer from the first sample. This depth buffer is from taken from the actual position of the viewpoint. (other samples shift this for anti aliasing). As SSR will reset the first 2 samples the depth buffer seems to be overwriten. It is unclear if this is related to the incorrect matrix of the viewpoint or that the incorrect buffer is being used for copy-ing. Discussed online that I will assign it to @fclem

We have researched in more depth. TAA will make a copy of the depth buffer from the first sample. This depth buffer is from taken from the actual position of the viewpoint. (other samples shift this for anti aliasing). As SSR will reset the first 2 samples the depth buffer seems to be overwriten. It is unclear if this is related to the incorrect matrix of the viewpoint or that the incorrect buffer is being used for copy-ing. Discussed online that I will assign it to @fclem

blender-admin commented

2019-07-18 12:55:11 +02:00

This issue was referenced by 687f1df5db

This issue was referenced by 687f1df5dbe256cd2f381350ad81526970595ee3

Clément Foucault commented

2019-07-18 12:55:53 +02:00

Changed status from 'Open' to: 'Resolved'

Clément Foucault closed this issue

2019-07-18 12:55:53 +02:00

Kei Muratagawa commented

2019-07-19 23:43:35 +02:00

Fixed in RC2. Thanks {icon smile-o}

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Painted area blinks in Weight Paint mode when the mesh is rigged (Blender 2.8.0 RC 1) #66811

Just paint with any brush (and take no effect)