iPad sidecar as a pen display lagging #81463

New Issue

Timm · 2020-10-05T19:47:09+02:00

Timm commented

2020-10-05 19:47:09 +02:00

System Information
Operating system: Windows-10-10.0.19041-SP0 64 Bits
Graphics card: Radeon RX Vega ATI Technologies Inc. 4.5.14736 Core Profile Context 20.9.1 27.20.12029.1000

Blender Version
Broken: version: 2.90.1, branch: master, commit date: 2020-09-23 06:43, hash: 3e85bb34d0
Worked: none

Short description of error
Using an iPad Pro 11" as a pen display mainly for Grease Pencil. It has a general lag which i assume has nothing to do with Blender. In Photoshop it works fine, but in Blender the pen strokes are not interpreted correctly. The strokes are shortened an heavily simplified. Fast strokes end up to be just short, straight lines or even nothing. It is not a working solution right now.

Exact steps for others to reproduce the error
Connect an iPad Pro via USB to a Mac (via the native Sidecar feature of macOS) or to a PC (with Duet for PC), open a new blank 2D Animation Template in Blender and try different pen strokes. It's most obvious with very fast strokes. Beside the PC setup above, I tried this with a Macbook Pro 13". The same Problem occurred.

**System Information** Operating system: Windows-10-10.0.19041-SP0 64 Bits Graphics card: Radeon RX Vega ATI Technologies Inc. 4.5.14736 Core Profile Context 20.9.1 27.20.12029.1000 **Blender Version** Broken: version: 2.90.1, branch: master, commit date: 2020-09-23 06:43, hash: `3e85bb34d0` Worked: none **Short description of error** Using an iPad Pro 11" as a pen display mainly for Grease Pencil. It has a general lag which i assume has nothing to do with Blender. In Photoshop it works fine, but in Blender the pen strokes are not interpreted correctly. The strokes are shortened an heavily simplified. Fast strokes end up to be just short, straight lines or even nothing. It is not a working solution right now. **Exact steps for others to reproduce the error** Connect an iPad Pro via USB to a Mac (via the native Sidecar feature of macOS) or to a PC (with Duet for PC), open a new blank 2D Animation Template in Blender and try different pen strokes. It's most obvious with very fast strokes. Beside the PC setup above, I tried this with a Macbook Pro 13". The same Problem occurred.

Timm commented

2020-10-05 19:47:09 +02:00

Added subscriber: @Granarte

Henrik D. commented

2020-10-06 23:14:07 +02:00

Added subscriber: @HDMaster84

Henrik D. commented

2020-10-06 23:14:07 +02:00

Can you show a video of this in action? It would also be interesting to have a look at your brush settings.

Henrik D. commented

2020-10-06 23:14:26 +02:00

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

Timm commented

2020-10-07 16:10:33 +02:00

Here's one video in Blender and one in Photoshop for comparison. As I said, there is a general lag, which isn't part of the bug. I assume that is just the latency that comes with this solution.

Blender (brush strength changed to 1.0):
https://www.dropbox.com/s/rctem2xb7a5rz02/Video%2007-10-2020%2C%2010%2048%2006.mov?dl=0

Photoshop:
https://www.dropbox.com/s/onci9n5x6h2l9tb/Video%2007-10-2020%2C%2010%2052%2053.mov?dl=0

My tablet preferences in Blender are the default, but I also tried playing around with them, which didn't have any effect. I also had to higher the pressure sensitivity in the Duet app in iOS, so the strokes are more visible.

Here's one video in Blender and one in Photoshop for comparison. As I said, there is a general lag, which isn't part of the bug. I assume that is just the latency that comes with this solution. Blender (brush strength changed to 1.0): https://www.dropbox.com/s/rctem2xb7a5rz02/Video%2007-10-2020%2C%2010%2048%2006.mov?dl=0 Photoshop: https://www.dropbox.com/s/onci9n5x6h2l9tb/Video%2007-10-2020%2C%2010%2052%2053.mov?dl=0 My tablet preferences in Blender are the default, but I also tried playing around with them, which didn't have any effect. I also had to higher the pressure sensitivity in the Duet app in iOS, so the strokes are more visible.

Yevgeny Makarov commented

2020-10-07 16:49:36 +02:00

Added subscriber: @jenkm

Yevgeny Makarov commented

2020-10-07 16:49:36 +02:00

This may not be related to iPad/macOS,
there is a common problem in Blender, #76699 #81211 #78856 #79425.

What is especially interesting, the video shows that Photoshop also has a similar issue
described in the #80087 #76550, at least that's what it looks like in the video above.

This may not be related to iPad/macOS, there is a common problem in Blender, #76699 #81211 #78856 #79425. What is especially interesting, the video shows that Photoshop also has a similar issue described in the #80087 #76550, at least that's what it looks like in the video above.

Timm commented

2020-10-07 19:42:09 +02:00

It looks like it might be the same issue being more prominent because of the latency.

Richard Antalik commented

2020-11-14 05:22:47 +01:00

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

Ankit Meel changed title from ~~iPad as a pen display lagging~~ to iPad sidecar as a pen display lagging

2021-04-25 05:10:43 +02:00

Ankit Meel commented

2021-04-25 05:11:42 +02:00

Closed as duplicate of #85394

Ankit Meel closed this issue

2021-04-25 05:11:42 +02:00

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iPad sidecar as a pen display lagging #81463