GPU subdivision: On cage option displaying new subdivided edges like actual edges #97053

New Issue

blendask · 2022-04-05T03:48:47+02:00

blendask commented

2022-04-05 03:48:47 +02:00

System Information
Operating system: Windows-10-10.0.15063-SP0 64 Bits
Graphics card: GeForce GTX 660/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 388.13

Blender Version
Broken: version: 3.2.0 Alpha, branch: master, commit date: 2022-04-04 15:54, hash: b5f3f8ef1d
Worked: (newest version of Blender that worked as expected)

Short Description
Before or without GPU subdiv when wireframe option is selected: Wireframes doesn't show up when On cage is selected for subdivision modifier
When GPU subdivision is enabled. We see the edges formed by the subdivision modifier. Moreover, these "virtual" modifier edges are visually indistinguishable from "real" edges (these edges even displays when wireframe option is unchecked)

Steps to Reproduce

Open default scene
delete cube and add UV sphere
Enable wireframe from overlays panel
subdivision modifier
edit mode
Optimal Display unchecked
Select On cage option (wires disappear for modifier edges)
Enable GPU subdivision (now they appear but their color matches with real edges)

Blend-file of demo-scene with reproduced condition
demo-scene.blend

Due to the fact that real edges and modifier edges are visually indistinguishable (in "On Cage" mode), we will get confused when trying to influence edges.
For example, the user wishes to select this edge. But he cannot select it, since this is not exactly an edge, this is a modifier calculations:

And it also looks ambiguous if Select → All. As if not everything seletced:

so. How should it look like in my opinion?

before click On Cage and after click On Cage (see screenshot below):
(i created the image in the editor. This is just an illustration)
in the example (second image), we see both: the wireframe, and real edges that can be edit manualy

But at this moment (v3.2) - we see it like this (please, don't forget full condition list above)

**System Information** Operating system: Windows-10-10.0.15063-SP0 64 Bits Graphics card: GeForce GTX 660/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 388.13 **Blender Version** Broken: version: 3.2.0 Alpha, branch: master, commit date: 2022-04-04 15:54, hash: `b5f3f8ef1d` Worked: (newest version of Blender that worked as expected) **Short Description** Before or without GPU subdiv when wireframe option is selected: Wireframes doesn't show up when On cage is selected for subdivision modifier When GPU subdivision is enabled. We see the edges formed by the subdivision modifier. Moreover, these "virtual" modifier edges are visually indistinguishable from "real" edges (these edges even displays when wireframe option is unchecked) **Steps to Reproduce** - Open default scene - delete cube and add UV sphere - Enable wireframe from overlays panel - subdivision modifier - edit mode - `Optimal Display` unchecked - Select On cage option (wires disappear for modifier edges) - Enable GPU subdivision (now they appear but their color matches with real edges) Blend-file of demo-scene with reproduced condition [demo-scene.blend](https://archive.blender.org/developer/F12977041/demo-scene.blend) Due to the fact that real edges and modifier edges are visually indistinguishable (in "On Cage" mode), we will get confused when trying to influence edges. For example, the user wishes to select this edge. But he cannot select it, since this is not exactly an edge, this is a modifier calculations: ![image.png](https://archive.blender.org/developer/F12925485/image.png) And it also looks ambiguous if `Select → All`. As if not everything seletced: ![image.png](https://archive.blender.org/developer/F12925490/image.png) so. **How should it look like in my opinion?** before click `On Cage` and after click `On Cage` (see screenshot below): (i created the image in the editor. This is just an illustration) in the example (second image), we see both: the wireframe, and real edges that can be edit manualy ![image.png](https://archive.blender.org/developer/F12925550/image.png) But at this moment (v3.2) - we see it like this (please, don't forget full condition list above) ![image.png](https://archive.blender.org/developer/F12972086/image.png)

blendask commented

2022-04-05 03:48:47 +02:00

Added subscriber: @blendask

Pratik Borhade commented

2022-04-05 07:20:17 +02:00

Added subscriber: @PratikPB2123

Omar Emara commented

2022-04-05 07:33:39 +02:00

Added subscriber: @OmarEmaraDev

Omar Emara commented

2022-04-05 07:33:39 +02:00

Changed status from 'Needs Triage' to: 'Needs User Info'

Omar Emara commented

2022-04-05 07:33:39 +02:00

In all versions I tested, I couldn't show edges when On Cage is enabled in the Maya theme. I followed the conditions above, should I have done something different?

In all versions I tested, I couldn't show edges when On Cage is enabled in the Maya theme. I followed the conditions above, should I have done something different? ![20220405-073055.png](https://archive.blender.org/developer/F12973193/20220405-073055.png)

blendask commented

2022-04-06 05:02:16 +02:00

@OmarEmaraDev

if Blender v3.1 migrate settins from v3.0 - then this issue occurs (returns).

in OS Windows — Blender's settings can be reversible withdraw by move the folder %appdata%\Blender Foundation\

after migrate settings - demo-scene looks like left
after reset settings - demo-scene looks like right

Unfortunately, this is an additional concomitant issue and an obstacle to understanding of the "main subject" in my report. Perhaps this should be taken out in a separate report.

my Blender's settings of v3.0 for reproduce this additional issue:
3.0.7z
Blend-file of demo-scene with reproduced condition
demo-scene.blend

@OmarEmaraDev if Blender v3.1 migrate settins from v3.0 - then [this issue ](https://developer.blender.org/T95899) occurs (returns). - *in OS Windows — Blender's settings can be reversible withdraw by move the folder `%appdata%\Blender Foundation\`* after migrate settings - demo-scene looks like left after reset settings - demo-scene looks like right ![image.png](https://archive.blender.org/developer/F12977036/image.png) Unfortunately, this is an additional concomitant issue and an obstacle to understanding of the "main subject" in my report. Perhaps this should be taken out in a separate report. - my Blender's settings of v3.0 for reproduce this additional issue: [3.0.7z](https://archive.blender.org/developer/F12977062/3.0.7z) - Blend-file of demo-scene with reproduced condition [demo-scene.blend](https://archive.blender.org/developer/F12977008/demo-scene.blend)

Omar Emara commented

2022-04-06 08:33:28 +02:00

Changed status from 'Needs User Info' to: 'Needs Triage'

Omar Emara commented

2022-04-06 08:33:28 +02:00

I can't get that to work in any version I tested, so I will leave this to someone else.

Pratik Borhade commented

2022-04-06 09:33:03 +02:00

I couldn't show edges when On Cage is enabled in the Maya theme. I followed the conditions above, should I have done something different?

@OmarEmaraDev , I'm guessing GPU subdivision is not enabled at your end.
I do see additional wires

GPU subdiv on	GPU subdiv OFF

> I couldn't show edges when On Cage is enabled in the Maya theme. I followed the conditions above, should I have done something different? @OmarEmaraDev , I'm guessing `GPU subdivision` is not enabled at your end. I do see additional wires | GPU subdiv on | GPU subdiv OFF | | -- | -- | | ![image.png](https://archive.blender.org/developer/F12977532/image.png) | ![image.png](https://archive.blender.org/developer/F12977535/image.png) |

Pratik Borhade commented

2022-04-06 09:36:23 +02:00

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

Pratik Borhade commented

2022-04-06 09:36:23 +02:00

I agree identifying actual edge becomes difficult. Confirming with small edits

Omar Emara commented

2022-04-06 09:41:01 +02:00

@PratikPB2123 Ah yes, indeed.

Pratik Borhade changed title from ~~on cage and wireframe~~ to GPU subdivision: On cage option displaying new subdivided edges like actual edges

2022-04-06 11:23:11 +02:00

Philipp Oeser commented

2022-04-13 11:13:00 +02:00

Added subscribers: @kevindietrich, @lichtwerk

Philipp Oeser commented

2022-04-13 11:13:00 +02:00

Talked to @kevindietrich , setting to High prio (since it is a bug in a new feature according to the playbook

Talked to @kevindietrich , setting to High prio (since it is a bug in a new feature according to the [playbook ](https://wiki.blender.org/wiki/Process/Bug_Reports/Triaging_Playbook)

blender-admin commented

2022-04-14 03:04:29 +02:00

This issue was referenced by 3f305b9ab3

This issue was referenced by 3f305b9ab3cb66374e6bdf4662ff1bfe90b3c225

Kévin Dietrich commented

2022-04-14 03:05:32 +02:00

Changed status from 'Confirmed' to: 'Resolved'

Kévin Dietrich closed this issue

2022-04-14 03:05:32 +02:00

Kévin Dietrich self-assigned this 2022-04-14 03:05:32 +02:00

blendask commented

2022-06-12 01:32:51 +02:00

after get in Edit Mode - Wireframe overlay just disappears 🥲
bandicam 2022-06-12 02-28-14-809.mp4
are my expectations wrong how it should work? 🥲

after get in Edit Mode - Wireframe overlay just disappears 🥲 [bandicam 2022-06-12 02-28-14-809.mp4](https://archive.blender.org/developer/F13147616/bandicam_2022-06-12_02-28-14-809.mp4) are my expectations wrong how it should work? 🥲 ![image.png](https://archive.blender.org/developer/F13147621/image.png)

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GPU subdivision: On cage option displaying new subdivided edges like actual edges #97053