Lag reading viewport depth buffer in LookDev mode #68206

New Issue

Jelle · 2019-08-04T06:49:46+02:00

Jelle commented

2019-08-04 06:49:46 +02:00

System Information
Operating system: macOS Sierra version 10.12.6
Graphics card: Radeon Pro 55 2048 MB

Blender Version
Broken: ( 2.80 )
Worked: (optional) ( 2.80, 3325b19ee7, branch: blender 2.7, 2019-06-06 )

Short description of error

In LookDev mode, zooming is extremely choppy. This topic was adressed earlier and dismissed a hardware issue. But the problem did not exist in an earlier version, suggesting it probably could be a software related issue. Check the video beneath.

Exact steps for others to reproduce the error
Based on the default startup or an attached .blend file.

devlook slow zooming.mp4

**System Information** Operating system: macOS Sierra version 10.12.6 Graphics card: Radeon Pro 55 2048 MB **Blender Version** Broken: ( 2.80 ) Worked: (optional) ( 2.80, 3325b19ee7fd, branch: blender 2.7, 2019-06-06 ) **Short description of error** In LookDev mode, zooming is extremely choppy. This topic was adressed earlier and dismissed a hardware issue. But the problem did not exist in an earlier version, suggesting it probably could be a software related issue. Check the video beneath. **Exact steps for others to reproduce the error** Based on the default startup or an attached .blend file. [devlook slow zooming.mp4](https://archive.blender.org/developer/F7648239/devlook_slow_zooming.mp4)

Jelle commented

2019-08-04 06:49:46 +02:00

Added subscriber: @Jelleeey

blender-admin commented

2019-08-04 06:49:46 +02:00

#89142 was marked as duplicate of this issue

blender-admin commented

2019-08-04 06:49:46 +02:00

#73827 was marked as duplicate of this issue

blender-admin commented

2019-08-04 06:49:46 +02:00

#63026 was marked as duplicate of this issue

William Reynish commented

2019-08-04 11:27:48 +02:00

Added subscriber: @WilliamReynish

William Reynish commented

2019-08-04 11:27:48 +02:00

How are you zooming? Using the scroll wheel or by using the modifier key and dragging you mouse, or a different way?

Jelle commented

2019-08-04 13:31:25 +02:00

Hi William,

I use the scroll wheel to zoom in and out.

Hi William, I use the scroll wheel to zoom in and out.

William Reynish commented

2019-08-04 14:17:34 +02:00

Is it also choppy when zooming using modifier+mouse-dragging?

Jelle commented

2019-08-04 14:43:05 +02:00

Interesting. Using ctrl + mmb (drag) the zooming goes smooth.

Jelle commented

2019-08-04 16:48:04 +02:00

I found the problem. For some reason, unchecking this box in the keymap for zoom in / zoom out resolves the problem. I unchecked this also for the pan and orbit keymap, as i discovered it acts more responsive with this checkbox off. However, maybe it is still a good idea to resolve this weird bug.

EDIT: This solution is not valid as it creates a new problem where the autodepth and 'zoom to mouse position' features are not working anymore.

I found the problem. For some reason, unchecking this box in the keymap for zoom in / zoom out resolves the problem. I unchecked this also for the pan and orbit keymap, as i discovered it acts more responsive with this checkbox off. However, maybe it is still a good idea to resolve this weird bug. EDIT: This solution is not valid as it creates a new problem where the autodepth and 'zoom to mouse position' features are not working anymore. ![Screen Shot 2019-08-04 at 16.41.27.png](https://archive.blender.org/developer/F7648772/Screen_Shot_2019-08-04_at_16.41.27.png)

Campbell Barton was assigned by William Reynish

2019-08-04 16:49:33 +02:00

William Reynish commented

2019-08-04 16:49:33 +02:00

Added subscriber: @ideasman42

William Reynish commented

2019-08-04 16:49:33 +02:00

@ideasman42 Unsure how to triage this?

Campbell Barton commented

2019-08-05 05:17:47 +02:00

Do you have "Auto Depth" preference enabled?
Does this happen with Factory Settings loaded?

It's possible getting the depth under the cursor is slower in look-dev mode, this only happens once w/ Ctrl-MMB, for mouse wheel it happens on every event because zooming isn't a mode in that case and each event could be over a different surface.

- Do you have "Auto Depth" preference enabled? - Does this happen with [Factory Settings ](https://docs.blender.org/manual/en/dev/getting_started/configuration/defaults.html#loading-factory-settings) loaded? ---- It's possible getting the depth under the cursor is slower in look-dev mode, this only happens once w/ Ctrl-MMB, for mouse wheel it happens on every event because zooming isn't a mode in that case and each event could be over a different surface.

Jelle commented

2019-08-05 06:03:23 +02:00

In #68206#745186, @ideasman42 wrote:

Do you have "Auto Depth" preference enabled?

Does this happen with Factory Settings loaded?

It's possible getting the depth under the cursor is slower in look-dev mode, this only happens once w/ Ctrl-MMB, for mouse wheel it happens on every event because zooming isn't a mode in that case and each event could be over a different surface.

I have auto depth enabled and use the factory settings in both versions (working and not working versions). I understand now that the issue is related to the autodepth feature. I understand what you say about the wheel zoom, where it sees every scroll as an event where the autodepth has to be recalculated. However, this does not explain why this behavior is not present in the previous version ( 2.80, 3325b19ee7, branch: blender 2.7, 2019-06-06 ).

> In #68206#745186, @ideasman42 wrote: > - Do you have "Auto Depth" preference enabled? > - Does this happen with [Factory Settings ](https://docs.blender.org/manual/en/dev/getting_started/configuration/defaults.html#loading-factory-settings) loaded? > > > ---- > > It's possible getting the depth under the cursor is slower in look-dev mode, this only happens once w/ Ctrl-MMB, for mouse wheel it happens on every event because zooming isn't a mode in that case and each event could be over a different surface. I have auto depth enabled and use the factory settings in both versions (working and not working versions). I understand now that the issue is related to the autodepth feature. I understand what you say about the wheel zoom, where it sees every scroll as an event where the autodepth has to be recalculated. However, this does not explain why this behavior is not present in the previous version ( 2.80, 3325b19ee7fd, branch: blender 2.7, 2019-06-06 ).

Jelle commented

2019-08-09 11:20:32 +02:00

Is this issue still looked at?

Jelle commented

2019-08-20 11:58:53 +02:00

I checked out the newest version (2.81 alpha ) and the lookdev mode performs well again.

EDIT: The issue still persists. Upon closer inspection it appears that the 2.81 alpha worked because the autodepth was turned off when I tried it. This was because the new build started up with the default user preferences.

I checked out the newest version (2.81 alpha ) and the lookdev mode performs well again. EDIT: The issue still persists. Upon closer inspection it appears that the 2.81 alpha worked because the autodepth was turned off when I tried it. This was because the new build started up with the default user preferences.

Campbell Barton commented

2019-08-20 13:47:02 +02:00

Changed status from 'Open' to: 'Resolved'

Campbell Barton closed this issue

2019-08-20 13:47:02 +02:00

Jelle commented

2019-09-23 09:40:10 +02:00

Changed status from 'Resolved' to: 'Open'

Jelle reopened this issue

2019-09-23 09:40:10 +02:00

Jelle commented

2019-09-23 09:40:10 +02:00

In the 2.81 alpha this issue still appears (Version 2.81 (2.81 2019-09-12)) This issue is really annoying. Could someone please look into this?

Campbell Barton commented

2020-01-13 12:15:58 +01:00

Changed status from 'Needs Developer To Reproduce' to: 'Confirmed'

Campbell Barton commented

2020-01-13 12:15:58 +01:00

I can confirm a slight delay in LookDev mode, it can be seen when placing the cursor too.

However the difference isn't much on my system, making profiler results not highlight the cause so easily. Marking this as TODO.

I can confirm a slight delay in LookDev mode, it can be seen when placing the cursor too. However the difference isn't much on my system, making profiler results not highlight the cause so easily. Marking this as TODO.

Campbell Barton changed title from ~~Slow zooming in LookDev~~ to Lag reading viewport depth buffer in LookDev mode

2020-01-13 12:17:54 +01:00

Campbell Barton removed their assignment 2020-01-13 12:17:54 +01:00

Campbell Barton commented

2020-01-13 12:17:54 +01:00

Removed subscriber: @ideasman42

Thomas Radeke commented

2020-10-06 09:41:21 +02:00

Added subscriber: @ThomasRadeke

Richard Antalik commented

2020-10-06 09:56:09 +02:00

Added subscribers: @olyandros, @fclem, @jenkm, @ckohl_art, @Brunomendesgussoni, @iss, @John_Do, @AbidMaqbool, @WickedInsignia, @DanielPaul, @Mets, @lichtwerk, @brecht, @ideasman42

Richard Antalik commented

2020-10-07 10:14:11 +02:00

Added subscribers: @xan2622, @MichaelHermann, @HooglyBoogly, @thsampa, @Pasang

Michael Hermann commented

2020-11-03 15:48:48 +01:00

After a while, I checked this (and #73827) again and I can no longer reproduce it. (2.90.1 or 2.91 Beta) Maybe it got fixed somewhere along the way.?

Logan Preshaw commented

2020-11-04 01:58:12 +01:00

This comment was removed by @WickedInsignia

*This comment was removed by @WickedInsignia*

Campbell Barton commented

2020-11-04 02:58:15 +01:00

@Jelleeey can you redo this in 2.91 or current daily build? (2.92 alpha).

Yevgeny Makarov commented

2020-11-04 06:01:07 +01:00

This issue is still present. I don't see any difference compared to previous versions.

Thomas Radeke commented

2020-11-04 10:13:29 +01:00

Just tried with 2.91.0 Beta, the lag is still present when Auto Depth is turned on.
I understand that re-using data you already have (depth buffer) is the preferred way to do things, but for zooming you're really just using one pixel of the entire buffer, right?
Wouldn't it be faster to do a single raycast to determine depth than to read a buffer that is only going to become bigger and bigger as monitor resolutions increase?
I'm using a 4K screen. When I resize my Blender window to be ~1/4th of the screen (e.g. Full HD), the lag is gone (or at least not noticable anymore).

Just tried with 2.91.0 Beta, the lag is still present when Auto Depth is turned on. I understand that re-using data you already have (depth buffer) is the preferred way to do things, but for zooming you're really just using one pixel of the entire buffer, right? Wouldn't it be faster to do a single raycast to determine depth than to read a buffer that is only going to become bigger and bigger as monitor resolutions increase? I'm using a 4K screen. When I resize my Blender window to be ~1/4th of the screen (e.g. Full HD), the lag is gone (or at least not noticable anymore).

Bruno commented

2020-11-04 10:21:31 +01:00

I had bought a 4k monitor to use in Blender, but it was a waste of money, as I can't use 'Auto depth', I had to use my old full hd monitor.

Michael Hermann commented

2020-11-04 10:43:37 +01:00

OK, with the Viewport in Fullscreen on a 4K Monitor, I can also see the lag again.
@Brunomendesgussoni : For me, the workaround was to turn off Viewport Anti-Aliasing.

OK, with the Viewport in Fullscreen on a 4K Monitor, I can also see the lag again. @Brunomendesgussoni : For me, the workaround was to turn off Viewport Anti-Aliasing.

Jelle commented

2020-11-04 11:40:47 +01:00

In #68206#1047609, @ideasman42 wrote:
@Jelleeey can you redo this in 2.91 or current daily build? (2.92 alpha).

@ideasman42 For me the issue still persists in the newest build (2.92 alpha)

> In #68206#1047609, @ideasman42 wrote: > @Jelleeey can you redo this in 2.91 or current daily build? (2.92 alpha). @ideasman42 For me the issue still persists in the newest build (2.92 alpha)

hujin commented

2021-03-31 18:54:36 +02:00

Added subscriber: @2046411367