Grease Pencil soft edge stroke glitch in some view angles #86048

New Issue

Mohamed · 2021-02-27T12:28:37+01:00

Mohamed commented

2021-02-27 12:28:37 +01:00

System Information
Operating system: Windows-10-10.0.18362-SP0 64 Bits
Graphics card: GeForce GTX 660/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 461.40

Blender Version
Broken: version: 2.92.0, branch: master, commit date: 2021-02-24 16:25, hash: 02948a2cab

Short description of error
When a grease pencil stroke / brush is soft or has transparency (object A) and put against another grease pencil object (object B). At certain viewing angles, object B becomes invisible around the edges of object A.

This happens in all three render engines, in viewport and renders, in version 2.91 and 2.92.

Exact steps for others to reproduce the error

Open the attached file
Look from the camera view to see the glitch in the stroke edge
you can also move with the middle mouse button until the same happens in certain viewing angles.
this should happen in 3 view modes, using 3 render engines, in viewport and renders, in version 2.91 and 2.92.

grease pencil soft edge bug.blend

{F9846388, size=full}

{F9846393, size=full}

**System Information** Operating system: Windows-10-10.0.18362-SP0 64 Bits Graphics card: GeForce GTX 660/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 461.40 **Blender Version** Broken: version: 2.92.0, branch: master, commit date: 2021-02-24 16:25, hash: `02948a2cab` **Short description of error** When a grease pencil stroke / brush is soft or has transparency (object A) and put against another grease pencil object (object B). At certain viewing angles, object B becomes invisible around the edges of object A. This happens in all three render engines, in viewport and renders, in version 2.91 and 2.92. **Exact steps for others to reproduce the error** - Open the attached file - Look from the camera view to see the glitch in the stroke edge - you can also move with the middle mouse button until the same happens in certain viewing angles. - this should happen in 3 view modes, using 3 render engines, in viewport and renders, in version 2.91 and 2.92. [grease pencil soft edge bug.blend](https://archive.blender.org/developer/F9846386/grease_pencil_soft_edge_bug.blend) {[F9846388](https://archive.blender.org/developer/F9846388/image.png), size=full} {[F9846393](https://archive.blender.org/developer/F9846393/image.png), size=full}

Mohamed commented

2021-02-27 12:28:37 +01:00

Added subscriber: @MumuMundo

Antonio Vazquez commented

2021-02-27 13:33:39 +01:00

Added subscriber: @antoniov

Antonio Vazquez commented

2021-02-27 13:33:39 +01:00

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

Antonio Vazquez commented

2021-02-27 13:33:39 +01:00

Could you try to move your cloud object a little to front. It looks in some angles the position of the objects makes teh drawing engine not able to decide the right z-depth. If I do that in my system, the problem is solved.

Antonio Vazquez commented

2021-02-27 13:39:48 +01:00

Tip: If for any artist reason, you cannot move the objects, then move only the origin of the cloud object.

Mohamed commented

2021-02-27 16:27:22 +01:00

Thank you very much. That seemed to fix it but when I played with it more it happened again as in this updated file :
grease pencil soft edge bug 1.2.blend
{F9847338,size=full}
In another case even putting the tree far from the houses produced the same result, but changing the origin of the houses to their geometry seemed to fix it :
File with problem :
grease pencil bug 2.blend

Fixed :
grease pencil bug 2 fixed.blend

If the tree is close to the houses, fixing the houses origin and moving the tree origin far away seems to fix most of the glitches, but not all :
grease pencil bug 2.2.blend
{F9847283,size=full}
{F9847288,size=full}

Thank you very much. That seemed to fix it but when I played with it more it happened again as in this updated file : [grease pencil soft edge bug 1.2.blend](https://archive.blender.org/developer/F9847196/grease_pencil_soft_edge_bug_1.2.blend) {[F9847338](https://archive.blender.org/developer/F9847338/image.png),size=full} In another case even putting the tree far from the houses produced the same result, but changing the origin of the houses to their geometry seemed to fix it : File with problem : [grease pencil bug 2.blend](https://archive.blender.org/developer/F9847174/grease_pencil_bug_2.blend) Fixed : [grease pencil bug 2 fixed.blend](https://archive.blender.org/developer/F9847275/grease_pencil_bug_2_fixed.blend) If the tree is close to the houses, fixing the houses origin and moving the tree origin far away seems to fix most of the glitches, but not all : [grease pencil bug 2.2.blend](https://archive.blender.org/developer/F9847326/grease_pencil_bug_2.2.blend) {[F9847283](https://archive.blender.org/developer/F9847283/image.png),size=full} {[F9847288](https://archive.blender.org/developer/F9847288/image.png),size=full}

Mohamed commented

2021-03-03 16:34:42 +01:00

Another example of the unwanted behaviour, even after I set origin points of the tree and the plane far apart.
{F9862738,size=full}

Another example of the unwanted behaviour, even after I set origin points of the tree and the plane far apart. {[F9862738](https://archive.blender.org/developer/F9862738/globe.png),size=full}

Philipp Oeser commented

2021-03-24 15:27:44 +01:00

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

Philipp Oeser commented

2021-09-23 10:14:01 +02:00

Added subscriber: @lichtwerk

Philipp Oeser commented

2021-09-23 10:14:01 +02:00

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

Philipp Oeser closed this issue

2021-09-23 10:14:01 +02:00

Philipp Oeser commented

2021-09-23 10:14:01 +02:00

Looking at this again (sorry this took so long to answer)
This is still the same problem:

the origins have to be separated far enough in Z-distance from the camera
when swinging the camera around this will change of course (so there might not be a single case of setting the origins that works from all camera angles)
so in the following case (and from that camera angle), the tree origin and the purple house origin are so that it is not clear the tree is in front of the house anymore [can be fixed (for this camera angle) by moving the origin of the tree by minus 0.5 in X]
{F9847288,size=full}
dont have a .blend file for palm trees, but assume the problem there is the same

For reference, this is the problem we are talking about https://docs.blender.org/manual/en/dev/render/eevee/materials/settings.html#sorting-problem [with the exception that grease pencil does not have a hashed Alpha mode, right @antoniov
?]

So in the end, this is a limitation, but will not be considered a bug (@antoniov : please correct me if I am wrong)

Looking at this again (sorry this took so long to answer) This is still the same problem: - the origins have to be separated far enough in Z-distance from the camera - when swinging the camera around this will change of course (so there might not be a single case of setting the origins that works from all camera angles) - so in the following case (and from that camera angle), the tree origin and the purple house origin are so that it is not clear the tree is in front of the house anymore [can be fixed (for this camera angle) by moving the origin of the tree by minus 0.5 in X] {[F9847288](https://archive.blender.org/developer/F9847288/image.png),size=full} - dont have a .blend file for palm trees, but assume the problem there is the same For reference, this is the problem we are talking about https://docs.blender.org/manual/en/dev/render/eevee/materials/settings.html#sorting-problem [with the exception that grease pencil does not have a hashed Alpha mode, right @antoniov ?] So in the end, this is a limitation, but will not be considered a bug (@antoniov : please correct me if I am wrong)

Antonio Vazquez commented

2021-09-23 10:25:38 +02:00

@lichtwerk You are totally right. Maybe in the future with new Eevee materials for GPencil this will be solved.

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Grease Pencil soft edge stroke glitch in some view angles #86048