Grease pencil stroke partially invisible until mouse-up #85764

New Issue

Tomasz Kaye · 2021-02-18T13:05:28+01:00

Tomasz Kaye commented

2021-02-18 13:05:28 +01:00

System Information
Operating system: Windows-10-10.0.18362-SP0 64 Bits
Graphics card: GeForce RTX 2060/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 457.30

Blender Version
Broken: version: 2.93.0 Alpha, branch: master, commit date: 2021-02-14 21:31, hash: 7a608f88a7

Short description of error
While drawing in the attached scene the stroke is only partially visible. The full line becomes visible only on mouse-up

Exact steps for others to reproduce the error

open the attached .blend
draw over the area with the 3d geometry behind it, only part of the line will show until you end the stroke (see video below)

Screen recording of the problem: https://youtu.be/Jehz9YAXmE0

Blend file: gpdrawbug.blend

**System Information** Operating system: Windows-10-10.0.18362-SP0 64 Bits Graphics card: GeForce RTX 2060/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 457.30 **Blender Version** Broken: version: 2.93.0 Alpha, branch: master, commit date: 2021-02-14 21:31, hash: `7a608f88a7` **Short description of error** While drawing in the attached scene the stroke is only partially visible. The full line becomes visible only on mouse-up **Exact steps for others to reproduce the error** * open the attached .blend * draw over the area with the 3d geometry behind it, only part of the line will show until you end the stroke (see video below) Screen recording of the problem: https://youtu.be/Jehz9YAXmE0 Blend file: [gpdrawbug.blend](https://archive.blender.org/developer/F9814806/gpdrawbug.blend)

Tomasz Kaye commented

2021-02-18 13:05:28 +01:00

Added subscriber: @info-27

blender-admin commented

2021-02-18 13:05:28 +01:00

#86029 was marked as duplicate of this issue

Philipp Oeser commented

2021-02-18 17:03:20 +01:00

Added subscribers: @antoniov, @lichtwerk

Philipp Oeser commented

2021-02-18 17:03:20 +01:00

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

Philipp Oeser commented

2021-02-18 17:03:20 +01:00

Can confirm.

@antoniov: this is not expected behavior, right?

Can confirm. @antoniov: this is not expected behavior, right?

Antonio Vazquez commented

2021-02-23 16:54:49 +01:00

I have been checking your file and this is a know limitation. Your GP object is very near in front of the cube. When you are drawing, the stroke is not projected (for speed reasons) and when you finish, the stroke is projected and visible. To solve your problem, you have two options: a) move a little your GP object in front or b) Draw on the surface, but then you need to have a full surface on back.

We cannot solve this issue, because we need to have a very fast response when you are drawing or the "feeling" of the pen is very bad.

I have been checking your file and this is a know limitation. Your GP object is very near in front of the cube. When you are drawing, the stroke is not projected (for speed reasons) and when you finish, the stroke is projected and visible. To solve your problem, you have two options: a) move a little your GP object in front or b) Draw on the surface, but then you need to have a full surface on back. We cannot solve this issue, because we need to have a very fast response when you are drawing or the "feeling" of the pen is very bad.

Sam Cogheil commented

2021-02-25 13:30:05 +01:00

Added subscriber: @SimplSam

Sam Cogheil commented

2021-02-25 13:30:05 +01:00

I am trying to get up to speed with GP, but I am also facing this (or similar) issue - but when using Reference Images. I first witnessed the issue in 2.93, but also present in 2.92 & 2.91.

For test purposes I also moved the ref image object 2m back from the GP object, but the result was the same.

In 2.93 - the 1st stroke is always totally invisible (when 'over' image) until the mouse is released. The subsequent stokes seem to be OK.
In 2.91 / 2.92 - the 1st stroke is partially visible - the next few strokes can be fully / partially visible depending on placement and what has gone before (i.e. The affected area moves).

bugz_GPStroke-RefImage#510225.mp4

I am trying to get up to speed with GP, but I am also facing this (or similar) issue - but when using **Reference Images**. I first witnessed the issue in 2.93, but also present in 2.92 & 2.91. For test purposes I also moved the ref image object 2m back from the GP object, but the result was the same. - In 2.93 - the 1st stroke is always totally invisible (when 'over' image) until the mouse is released. The subsequent stokes seem to be OK. - In 2.91 / 2.92 - the 1st stroke is partially visible - the next few strokes can be fully / partially visible depending on placement and what has gone before (i.e. The affected area moves). [bugz_GPStroke-RefImage#510225.mp4](https://archive.blender.org/developer/F9838410/bugz_GPStroke-RefImage_510225.mp4)

Antonio Vazquez commented

2021-02-25 15:25:48 +01:00

If you enable In Front, the stroke is visible:

If you enable In Front, the stroke is visible: ![image.png](https://archive.blender.org/developer/F9838742/image.png)

Sam Cogheil commented

2021-02-25 17:12:38 +01:00

Hi Antonio. I have tried - [x] In Front - also with a new doc (attached) and it is still not working properly - as per the video.

Also tried on another Win 10 laptop machine with 2.83 (same issue)

gp_ref_image_example.blend

Hi Antonio. I have tried - [x] In Front - also with a new doc (attached) and it is still not working properly - as per the video. Also tried on another Win 10 laptop machine with 2.83 (same issue) [gp_ref_image_example.blend](https://archive.blender.org/developer/F9839075/gp_ref_image_example.blend)

Philipp Oeser commented

2021-05-03 17:53:38 +02:00

Added subscriber: @MariusGiurgi

Philipp Oeser removed the

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Grease pencil stroke partially invisible until mouse-up #85764