Multires: Missing updates are not communicated in the UI #73355

New Issue

Alex · 2020-01-24T11:10:42+01:00

Alex commented

2020-01-24 11:10:42 +01:00

System Information
Intel Core i7, 16 Gb RAM, NVidia GeForce 2070 RTX
Windows 10 x64

Blender Version
Broken: 2.8x up to 6fff73e3f0 from 2020-01-23
Worked: 2.79b

Short description of error
Currently it’s not possible to use Shrinkwrap (modifier and constraint) and Walk Navigation with Gravity (toggling Gravity causes you to fall through the floor, teleporting doesn't work) with object that has subdivided Multires and is in Sculpt Mode. In 2.79 Shrinkwraps are not updating during sculpting but it's still possible to see where objects are being shrinkwrapped. Not being able to see shrinkwraps becomes problematic in a very similar way as not being able to see textures while sculpting.

Exact steps for others to reproduce the error

Open provided file in 2.79 and observe that Road and House objects are shrinkwrapped to the Landscape object while subdivided Multires is in Sculpt mode. You can use Walk Navigation with Gravity to walk or teleport over the surface.
Open provided file in 2.8, both Shrinkwraps will be disabled and you will not be able to teleport or walk across the surface in Walk Navigation mode.
No_Shrinkwrap_and_Walk_Gravity.blend

**System Information** Intel Core i7, 16 Gb RAM, NVidia GeForce 2070 RTX Windows 10 x64 **Blender Version** Broken: 2.8x up to 6fff73e3f001 from 2020-01-23 Worked: 2.79b **Short description of error** Currently it’s not possible to use Shrinkwrap (modifier and constraint) and Walk Navigation with Gravity (toggling Gravity causes you to fall through the floor, teleporting doesn't work) with object that has subdivided Multires and is in Sculpt Mode. In 2.79 Shrinkwraps are not updating during sculpting but it's still possible to see where objects are being shrinkwrapped. Not being able to see shrinkwraps becomes problematic in a very similar way as not being able to see textures while sculpting. **Exact steps for others to reproduce the error** 1. Open provided file in 2.79 and observe that Road and House objects are shrinkwrapped to the Landscape object while subdivided Multires is in Sculpt mode. You can use Walk Navigation with Gravity to walk or teleport over the surface. 2. Open provided file in 2.8, both Shrinkwraps will be disabled and you will not be able to teleport or walk across the surface in Walk Navigation mode. [No_Shrinkwrap_and_Walk_Gravity.blend](https://archive.blender.org/developer/F8299044/No_Shrinkwrap_and_Walk_Gravity.blend)

Alex commented

2020-01-24 11:10:42 +01:00

Added subscriber: @SpectreFirst

Pablo Dobarro commented

2020-01-27 02:59:48 +01:00

Added subscriber: @PabloDobarro

Pablo Dobarro commented

2020-01-27 02:59:48 +01:00

In 2.79, the shrink wrap does not update in sculpt mode, so the walk navigation mode geometry will also be incorrect if you deform the mesh too much, (it only updates when you enter/exit sculpt mode). In 2.80, the modifiers are disabled. Multires is intended to be used for high poly sculpting. While using sculpt mode, we should try to avoid unnecessary updates related to modifiers and other objects/functionality. Maybe it is possible to add the missing updates to make it work, but it will make sculpting much slower. I consider this the intended behavior, but it is true that it is not properly communicated in the UI.
2020-01-27 03-03-35.mp4

In 2.79, the shrink wrap does not update in sculpt mode, so the walk navigation mode geometry will also be incorrect if you deform the mesh too much, (it only updates when you enter/exit sculpt mode). In 2.80, the modifiers are disabled. Multires is intended to be used for high poly sculpting. While using sculpt mode, we should try to avoid unnecessary updates related to modifiers and other objects/functionality. Maybe it is possible to add the missing updates to make it work, but it will make sculpting much slower. I consider this the intended behavior, but it is true that it is not properly communicated in the UI. [2020-01-27 03-03-35.mp4](https://archive.blender.org/developer/F8304063/2020-01-27_03-03-35.mp4)

Pablo Dobarro changed title from ~~Multires: Shrinkwrap and Walk Navigation Gravity don’t work in Sculpt Mode~~ to Multires: Missing updates are not communicated in the UI

2020-01-27 03:00:39 +01:00

Campbell Barton commented

2020-01-27 05:59:18 +01:00

Added subscriber: @ideasman42

Campbell Barton commented

2020-01-27 05:59:18 +01:00

We could fall-back to a depth-test for teleport easily enough, although this isn't as simple for gravity which would need to use a temporary view.

Alex commented

2020-01-29 18:16:44 +01:00

Potential increase in speed makes it practically pointless if you cannot see what you are doing (like in my example with road and houses or when you have clothing and accessories shrinkwrapped to a character) so there must be an option to enable modifier updates during sculpting to sacrifice some performance in favor of visual feedback that you can always keep disabled by default and favor the speed. The same thing should be done with texture display – if textures actually affect sculpting performance it should be possible to enable them in favor of visual feedback or disable them and favor sculpting performance. Applying a modifier on an object without Multires partially solves the problem with texture display already so instead of using that counterintuitive workaround there should be just options in sculpting mode.

Campbell Barton commented

2020-02-12 08:21:26 +01:00

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

Philipp Oeser removed the

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Multires: Missing updates are not communicated in the UI #73355