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Grease pencil rendering inconsistency when lines are intersecting geometry
Confirmed, NormalPublicKNOWN ISSUE

Description

System Information
Operating system: Windows-10-10.0.19041-SP0 64 Bits
Graphics card: GeForce GTX 750 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 451.67

Blender Version
Broken:
2.83.3, branch: master, commit date: 2020-07-22 06:01, hash: rB353e5bd7493e
2.90.0 Beta, branch: master, commit date: 2020-08-01 02:15, hash: rB72b422c1e101
2.91.0 Alpha, branch: master, commit date: 2020-08-01 19:56, hash: rB7cd2c1fd2e7a

Short description of error
Grease pencil lines are sometimes rendered, sometimes not, depending on distance from camera. This seems
to be caused by the grease pencil line intersecting the plane:


In viewport same line is always rendered however (both in solid and rendered modes), which is confusing.

Exact steps for others to reproduce the error

  • Open file:

  • Hit render. Grease pencil line will not be rendered.
  • Move camera -1 or +1 on y axis. Render. Line is still not visible.
  • Move camera -1.1 or +1.1 on y axis instead and the line will get rendered.

Event Timeline

Antonio Vazquez (antoniov) changed the task status from Needs Triage to Confirmed.Aug 3 2020, 10:21 AM
Antonio Vazquez (antoniov) changed the subtype of this task from "Report" to "Known Issue".

This is a problem with the anti-aliasing algorithm. We are working on it.

@Clément Foucault (fclem) is that correct?

Just thought I'd add for those of you waiting for a fix.
Rendering with cycles doesn't seem to have this issue.
It's only eevee that has it. At least for me with said test files.
So at the cost of render times you'll at least still be able to get a result that works.