Shrink mask doesn't work if all polys are masked on non-watertight geometry #80032

New Issue

Robert Rioux · 2020-08-23T04:59:26+02:00

Robert Rioux commented

2020-08-23 04:59:26 +02:00

System Information
Operating system: Darwin-16.7.0-x86_64-i386-64bit 64 Bits
Graphics card: NVIDIA GeForce GTX 980 OpenGL Engine NVIDIA Corporation 4.1 NVIDIA-10.18.5 378.05.05.25f19

Blender Version
Broken: version: 2.90.0 Alpha, branch: master, commit date: 2020-06-08 15:55, hash: 9f7d84b656
Worked: (newest version of Blender that worked as expected)

Short description of error
Shrink mask doesn't work if all polys are masked on a geometry with borders (non-watertight)

Exact steps for others to reproduce the error
Make a grid. Go to sculpt mode. mask everything, shrink. Nothing happens.

I was trying to find a way to pin the borders of my geometry. I though I could mask everything, shrink, then inverse the mask.
Being able to pin the borders is a must for sculpting. It should be part of Blender.

**System Information** Operating system: Darwin-16.7.0-x86_64-i386-64bit 64 Bits Graphics card: NVIDIA GeForce GTX 980 OpenGL Engine NVIDIA Corporation 4.1 NVIDIA-10.18.5 378.05.05.25f19 **Blender Version** Broken: version: 2.90.0 Alpha, branch: master, commit date: 2020-06-08 15:55, hash: `9f7d84b656` Worked: (newest version of Blender that worked as expected) **Short description of error** Shrink mask doesn't work if all polys are masked on a geometry with borders (non-watertight) **Exact steps for others to reproduce the error** Make a grid. Go to sculpt mode. mask everything, shrink. Nothing happens. I was trying to find a way to pin the borders of my geometry. I though I could mask everything, shrink, then inverse the mask. Being able to pin the borders is a must for sculpting. It should be part of Blender.

Robert Rioux commented

2020-08-23 04:59:26 +02:00

Added subscriber: @Funnybob

Richard Antalik commented

2020-08-25 05:19:59 +02:00

Added subscribers: @PabloDobarro, @iss

Richard Antalik commented

2020-08-25 05:19:59 +02:00

It doesn't look like geometry has to be not-watertight

If I understand code well, it changes value of mask to be same as neighbor valueit neighbors is lower. That means that shrink can't result in mask with lower value than existing lowest mask value.

Your described workflow seems useful but that would be feature request. @PabloDobarro what do you think about this?

It doesn't look like geometry has to be not-watertight If I understand code well, it changes value of mask to be same as neighbor valueit neighbors is lower. That means that shrink can't result in mask with lower value than existing lowest mask value. Your described workflow seems useful but that would be feature request. @PabloDobarro what do you think about this?

Robert Rioux commented

2020-08-25 15:02:40 +02:00

I wrote non-watertight because if you grow the mask all the way on a sphere, then it won't have a way to know from where to shrink, unless Blender keeps the history in memory. Anyway, as a user, I don't really care how the code works. If the function is called shrink mask and in that situation it doesn't do it, then it's a bug. :-) Cheers

Robert Rioux commented

2020-08-25 15:15:13 +02:00

I tested it again and I realized that as soon as the mask reaches the edge of the geometry, it won't shrink again, so it's not only when everything is masked.

While we're on the mask subject, I found that it's impossible to select the centre of a geometry using the lasso mask tool because as soon you exit the menu, the lasso is active and you can't reach the part you want without affecting the rest. It should be like the box select. It's active only once you've click, which is the behaviour of the lasso tool for vertices.

I tested it again and I realized that as soon as the mask reaches the edge of the geometry, it won't shrink again, so it's not only when everything is masked. While we're on the mask subject, I found that it's impossible to select the centre of a geometry using the lasso mask tool because as soon you exit the menu, the lasso is active and you can't reach the part you want without affecting the rest. It should be like the box select. It's active only once you've click, which is the behaviour of the lasso tool for vertices.

Robert Rioux commented

2020-08-25 15:22:14 +02:00

In Maya, there's a cool feature for sculpting that I dearly miss. If you have vertices selected before going into the sculpt tool, then only the selected vertices will be affected by the sculpt tool, so no need to deal with masks (masks are also available). There are many ways to select vertices in Blender and that would be super useful. It's much faster than having to create masks. This is the point of view of a hard surface modeler. It seem like the sculpt tool was design with organic modelling in mind, X mirror being on by default (which is very annoying for hard surfaces). X mirror should not be turned on by default or at least it should be in the prefs somewhere to that the user can decide. OK, I'm done.

Pablo Dobarro commented

2020-08-25 15:41:17 +02:00

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

Pablo Dobarro closed this issue

2020-08-25 15:41:17 +02:00

Pablo Dobarro self-assigned this 2020-08-25 15:41:17 +02:00

Pablo Dobarro commented

2020-08-25 15:41:17 +02:00

There is boundary automasking which already pins mesh borders. I can make a separate tool for generating a mask from the borders, but I don't think shrink mask should do that, otherwise you won't be able to do this:
2020-08-25 15-34-02.mp4

There is boundary automasking which already pins mesh borders. I can make a separate tool for generating a mask from the borders, but I don't think shrink mask should do that, otherwise you won't be able to do this: [2020-08-25 15-34-02.mp4](https://archive.blender.org/developer/F8810467/2020-08-25_15-34-02.mp4)

Robert Rioux commented

2020-08-25 15:49:43 +02:00

There is boundary automasking which already pins mesh borders.

Really? Cool. How?

I can make a separate tool for generating a mask from the borders,

Help me Obiwan Kenobi. You're my only hope.

but I don't think shrink mask should do that, otherwise you won't be able to do this

Good point.

> There is boundary automasking which already pins mesh borders. Really? Cool. How? > I can make a separate tool for generating a mask from the borders, Help me Obiwan Kenobi. You're my only hope. > but I don't think shrink mask should do that, otherwise you won't be able to do this Good point.

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Shrink mask doesn't work if all polys are masked on non-watertight geometry #80032