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Camera lag with Auto Depth turned on
Open, Needs Information from UserPublic

Description

System Information
Operating system: Windows 10 (1809)
Graphics card: GTX 1070

Blender Version
2.80, 532536bf52da, beta, 2019-03-27

Short description of error
I am experiencing a lag in camera movement while sculpting with activated Auto Depth. With Auto Depth active there is a lag by about one second until Blender reacts to my camera movements. With Auto Depth turned off the lag is gone. This behavior only occurres on denser meshes (about 2 million polys in this case).
I can reproduce the same lag on Windows with NVIDIA Graphis (GTX 1070) as on a Mac Pro with AMD Graphics (RX 580).

Here is also a screen capture to illustrate the problem.
https://www.dropbox.com/s/xajkvcg3xawheqw/blender_28_autodepth_lag.mp4?dl=0{F6892502}

Details

Type
Bug

Event Timeline

Not sure if this can be considered a bug.

With Auto Depth a bunch of extra things have to be done (drawing ZBuff etc.) which might eat some performance on highres geometry...
Would ask @Campbell Barton (campbellbarton) (maybe @Clément Foucault (fclem), @Brecht Van Lommel (brecht) as well?) if there is room for improvement here?

There is no lag with the same scene in 2.79 with or without Auto Depth. Also I notice much lower viewport performance (fps) in 2.80 compared to 2.79.

Let's first fix T60043: macOS viewport lagging and then see what the performance looks like for the various settings.

Wait, I confused this with another report..

Brecht Van Lommel (brecht) triaged this task as Needs Information from User priority.Tue, May 21, 11:21 AM

To me this kind of excessive lagging definitely sounds like a bug.

@Oliver Harries (olyandros), there have been recent changes in drawing of the depth buffer, could you verify if it's still an issue?