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Grease pencil materials render as black
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Description

System Information
Operating system: Windows-10-10.0.19041-SP0 64 Bits
Graphics card: GeForce GTX 1070/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 457.51

Blender Version
Broken: version: 2.93.0 Beta, branch: master, commit date: 2021-04-17 19:55, hash: rB4bce9c5283e5

Short description of error
After doing a bit of line cleanup, all of my Fill materials are rendering as black. A couple Line materials have retained their color, but any new materials, either line or fill, just appear black. The issue does not appear in the Solid viewport shading.

Exact steps for others to reproduce the error
Load the attached file.

Event Timeline

Philipp Oeser (lichtwerk) changed the task status from Needs Triage to Needs Information from User.Mon, Apr 19, 12:36 PM

Looks like these have all been painted in vertex color mode [and with a black color] unintentionally?


https://docs.blender.org/manual/en/dev/grease_pencil/modes/draw/tool_settings/color.html

Not an expert in greaspencil, but it seems the quickest way to get it back to material colors is to select each stroke, unlock all those layers, go into vertex paint mode, select all strokes and do
Paint > Reset Vertex Color

Does this work for you?

IronTooth (irontooth23456) claimed this task.

That works, thank you so much! I have no idea how that all got painted in vertex paint - maybe I accidentally switched to it when I was doing my lineart and fill cleanup? I think that must be it. I was having quite a freakout there, several days worth of work seemingly ruined - you've really made my day!