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I'm wanted to draw with two colors, each on a layer with a multiply blend mode of the same Grease pencil object. It always ends up having a thin gap where the colors overlap. Any ideas of why this is happening and how I can fix it ?

Here's a screenshot and more info : blue and red multiply grease pencil doodle

So the red layer is the one underneath and the blue layer is on top, but only the red layer (bottom) has this gap or line around it. I've tried changing the stroke depth order, the blend mode, and basically all the other parameters in the object layer tab. But nothing gives, and when rendered it's still there.

It looks like it may be because the layers are on the same plane, but I know I can't move them individually as they're part of the same grease pencil object. Then again I've seen videos where this issue isn't present, so I wondering if I'm not the one doing something wrong here.

I've found this thread that as the same issue in the developer forums.

I'm running Ubuntu 20.04 and using Blender 2.82a.

To replicate this issue :

  • Create a new 2D animation

  • Create 2 new materials (or use the default black and red strokes)

  • Use any brush, with strength at 1.0 for better results

  • Make overlapping doodles with one of the colors on one layer and with another color and a second layer

  • Switch the top layer's blend mode to multiply (or any other but regular)

Any ideas ?

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  • $\begingroup$ Late to the party on this one but I had the same problem. I found that this issue wasn't present in the Beta 2.9 version of Blender if that helps. $\endgroup$ – Matt Jun 15 '20 at 19:21
  • $\begingroup$ Thanks for letting me know. Haven't tried 2.9 yet :) Edit : I just checked and this issue isn't there in 2.83 either. $\endgroup$ – darkbean Jun 17 '20 at 8:30
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Ok so I found a solution to my problem, I'm posting it here in case it may help someone some day.

The white line or gap goes away if you add a third layer underneath them with a fill to act as a background. Here is a screenshot where I drew a white fill shape under the right part of my two other multiply layers :

enter image description here

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