Blur brush(Weight Paint): Take edge distance into consideration when blurring weights #87238

New Issue

Demeter Dzadik · 2021-04-06T15:50:09+02:00

Demeter Dzadik commented

2021-04-06 15:50:09 +02:00

The current Blur brush is difficult to use in cases where the mesh topology is not very uniform. More vertex-dense areas will get affected by the weight blurring "less".

I discussed this briefly with @ZedDB over chat, also with a quick look at D10068 which seems like it could be useful for improving the Blur brush.

Here is a simple example:
weight_paint_blur-2021-04-06_12.47.00.mp4
weight_paint_blur_test.blend

As you can see, when the cylinder has fairly uniform density, the result I get from blurring is what I expect(even if it looks ugly in this example), but when I add extra edge loops, the result is totally different. This is not necessarily unexpected, and in some cases it might even be desired. So here's a more realistic example, on an actual character with details modeled in:
weight_paint_rex_blur-2021-04-06_15.37.04.mp4
Notice especially the banding of the colors. I was blurring it as much as I could, but there'd still be clearly visible bands where the topology is more dense.
If I remove some edge loops to try to get more evenly distributed faces, I can make a clean gradient again, with no bands:
weight_paint_rex_edges_removed-2021-04-06_15.38.18.mp4

The goal would be to be able to create a clean gradient like this, even with uneven topology. This could allow rigging more complex meshes "directly" rather than using indirect methods like Mesh Deform/Surface Deform, which come with their own sets of inherent limitations.

The current Blur brush is difficult to use in cases where the mesh topology is not very uniform. More vertex-dense areas will get affected by the weight blurring "less". I discussed this briefly with @ZedDB over chat, also with a quick look at [D10068](https://archive.blender.org/developer/D10068) which seems like it could be useful for improving the Blur brush. Here is a simple example: [weight_paint_blur-2021-04-06_12.47.00.mp4](https://archive.blender.org/developer/F9921811/weight_paint_blur-2021-04-06_12.47.00.mp4) [weight_paint_blur_test.blend](https://archive.blender.org/developer/F9921812/weight_paint_blur_test.blend) As you can see, when the cylinder has fairly uniform density, the result I get from blurring is what I expect(even if it looks ugly in this example), but when I add extra edge loops, the result is totally different. This is not necessarily unexpected, and in some cases it might even be desired. So here's a more realistic example, on an actual character with details modeled in: [weight_paint_rex_blur-2021-04-06_15.37.04.mp4](https://archive.blender.org/developer/F9921836/weight_paint_rex_blur-2021-04-06_15.37.04.mp4) Notice especially the banding of the colors. I was blurring it as much as I could, but there'd still be clearly visible bands where the topology is more dense. If I remove some edge loops to try to get more evenly distributed faces, I can make a clean gradient again, with no bands: [weight_paint_rex_edges_removed-2021-04-06_15.38.18.mp4](https://archive.blender.org/developer/F9921839/weight_paint_rex_edges_removed-2021-04-06_15.38.18.mp4) The goal would be to be able to create a clean gradient like this, even with uneven topology. This could allow rigging more complex meshes "directly" rather than using indirect methods like Mesh Deform/Surface Deform, which come with their own sets of inherent limitations.

Demeter Dzadik commented

2021-04-06 15:50:09 +02:00

Added subscribers: @ZedDB, @Mets

Sebastian Parborg was assigned by Demeter Dzadik

2021-04-06 16:27:29 +02:00

Philipp Oeser commented

2021-04-07 09:10:05 +02:00

Added subscriber: @lichtwerk

Philipp Oeser commented

2021-04-07 09:10:05 +02:00

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

Philipp Oeser commented

2021-04-07 09:10:05 +02:00

I guess this can be in "confirmed" status then.

Philipp Oeser removed the

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Blur brush(Weight Paint): Take edge distance into consideration when blurring weights #87238