GPencil: Select Circle misses points when dragging fast over strokes in material preview or rendered viewing modes #79132

New Issue

Tomasz Kaye · 2020-07-21T10:01:15+02:00

Tomasz Kaye commented

2020-07-21 10:01:15 +02:00

System Information
Operating system: Darwin-19.3.0-x86_64-i386-64bit 64 Bits
Graphics card: AMD Radeon Pro 580 OpenGL Engine ATI Technologies Inc. 4.1 ATI-3.5.5

Blender Version
Broken: version: 2.90.0 Alpha, branch: master, commit date: 2020-06-28 15:13, hash: b21ba5e579

Short description of error
The Select Circle tool regularly misses points when dragging over them in material preview or rendered viewing mode.

Exact steps for others to reproduce the error

Open the attached .blend file
Drag quickly over the line (solid mode), the points are correctly selected.
Switch to Material Preview and drag quickly over the line, not all points on the drag path are correctly selected.

Notes
For me the cursor movement (UI update?) has a much lower frame rate while in material preview or rendered viewing mode. So while dragging quickly over the points in a stroke, some points never overlap the select circle radius on any of the frames of the drag. And it looks like the position of the Select Circle isn't being interpolated between frames.

This means that points don't get selected that should have been, so I have to make the selection again.

In solid or wireframe mode the FPS is high enough that no points are missed, but these modes are often not good enough to get a proper feel for the image i'm working on.

selectcircle.blend

**System Information** Operating system: Darwin-19.3.0-x86_64-i386-64bit 64 Bits Graphics card: AMD Radeon Pro 580 OpenGL Engine ATI Technologies Inc. 4.1 ATI-3.5.5 **Blender Version** Broken: version: 2.90.0 Alpha, branch: master, commit date: 2020-06-28 15:13, hash: `b21ba5e579` **Short description of error** The Select Circle tool regularly misses points when dragging over them in material preview or rendered viewing mode. **Exact steps for others to reproduce the error** * Open the attached .blend file * Drag quickly over the line (solid mode), the points are correctly selected. * Switch to Material Preview and drag quickly over the line, not all points on the drag path are correctly selected. **Notes** For me the cursor movement (UI update?) has a much lower frame rate while in material preview or rendered viewing mode. So while dragging quickly over the points in a stroke, some points never overlap the select circle radius on any of the frames of the drag. And it looks like the position of the Select Circle isn't being interpolated between frames. This means that points don't get selected that should have been, so I have to make the selection again. In solid or wireframe mode the FPS is high enough that no points are missed, but these modes are often not good enough to get a proper feel for the image i'm working on. [selectcircle.blend](https://archive.blender.org/developer/F8710916/selectcircle.blend)

Tomasz Kaye commented

2020-07-21 10:01:15 +02:00

Added subscriber: @info-27

Tomasz Kaye commented

2020-07-21 10:02:41 +02:00

A video showing the result i'm getting (see low FPS in material preview mode despite being a very simple scene) Screen Recording 2020-07-21 at 09.47.00.mov

A video showing the result i'm getting (see low FPS in material preview mode despite being a very simple scene) [Screen Recording 2020-07-21 at 09.47.00.mov](https://archive.blender.org/developer/F8710919/Screen_Recording_2020-07-21_at_09.47.00.mov)

Antonio Vazquez commented

2020-07-21 15:50:31 +02:00

Added subscribers: @filedescriptor, @antoniov

Antonio Vazquez commented

2020-07-21 15:50:31 +02:00

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

Antonio Vazquez commented

2020-07-21 15:50:31 +02:00

I cannot reproduce on Windows. The speed of the mouse depends on the capacity of the CPU to process the events, so I cannot do too much here.

@filedescriptor Can you reproduce it?

I cannot reproduce on Windows. The speed of the mouse depends on the capacity of the CPU to process the events, so I cannot do too much here. @filedescriptor Can you reproduce it?

Antonio Vazquez changed title from ~~Grease Pencil. Select Circle misses points when dragging over strokes in material preview or rendered viewing modes~~ to GPencil: Select Circle misses points when dragging fast over strokes in material preview or rendered viewing modes

2020-07-21 15:50:53 +02:00

Falk David commented

2020-07-23 10:49:59 +02:00

I tested on 2.91.0 Alpha 62e53788aa master.

So I was able to reproduce the bug (points are not selected while moving fast in circle select), but I did not experience any lag whatsoever. For me the points are not selected when I move really fast (I have to flick the mouse). This is also the case for meshes. I believe the lag issue is not related to grease pencil, but most likely EEVEE/Workbench performance on the users system, which slows down the UI. On the other hand, the circle select is not checking for selection in-between modal updates (only the radius of a single update). The question is if that is a bug, or a limitation.

I tested on 2.91.0 Alpha 62e53788aad master. So I was able to reproduce the bug (points are not selected while moving fast in circle select), but I did not experience any lag whatsoever. For me the points are not selected when I move really fast (I have to flick the mouse). This is also the case for meshes. I believe the lag issue is not related to grease pencil, but most likely EEVEE/Workbench performance on the users system, which slows down the UI. On the other hand, the circle select is not checking for selection in-between modal updates (only the radius of a single update). The question is if that is a bug, or a limitation.

Antonio Vazquez commented

2020-07-23 18:46:23 +02:00

IMHO this is a limitation of the event processing. I had similar issues drawing very fast a stroke. IIRC there is a patch in progress to get high frequency events.

Richard Antalik commented

2020-07-31 14:42:59 +02:00

Added subscriber: @iss

Richard Antalik commented

2020-07-31 14:42:59 +02:00

Should we confirm this as known issue then? Otherwise we shold close this.

Antonio Vazquez commented

2020-08-01 10:33:21 +02:00

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

Philipp Oeser removed the

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GPencil: Select Circle misses points when dragging fast over strokes in material preview or rendered viewing modes #79132