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I've googled different ways to convert the grease pencil stroke to the mesh. Unfortunately, they all do not respect the stroke thickness, because all the ways that I found use direct conversion to lines/bezier curves/polygon curves. That makes lines have even thickness instead of the thickness of a stroke: converted to polycurve

So I have found a workaround: I apply the "Outline" modifier to the stroke first, then I convert the stroke to the polyline, then to mesh, then select all the edges and extrude them, so I have an outline as an extruded mesh:

extruded mesh without caps

But this isn't a solution because the extruded mesh does not have caps, having a hole instead. I've tried to fill it using Alt+F, but it fails to fill holes on the complex shapes, especially when line intersects itself. I've tried to autosplit intersecting edges and then Alt+F it again, but it fails to fill the holes correctly because the line is concave: concave fill failure

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2 Answers 2

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Since Blender 3.4.1, in Draw Mode of a GP Stroke, there's a checkbox Outline in the top menu bar under Stroke.

enter image description here

This amazing new feature creates not the center line of the Stroke, but instead creates the perimeter Line (inluding varying thickness from pen tablet):

enter image description here

So, this might be a good start. Depending on your Stroke geometry, you might want to use a Simplify Modifier on it. If you have overlapping strokes, try the Cutter in Draw Mode. For cleanup, convert Stroke to Polyline, convert again to Mesh and Merge at Center in Edit Mode: enter image description here enter image description here

After cleanup, select all and hit Alt+F to fill. enter image description here

This can fail at the caps of the stroke, depending on geometry. Just fill the failed areas with Ngons (select that area's border, then just hit F).

Finally, add a Solidify Modifier:

enter image description here

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  • $\begingroup$ Thank you for your answer, the outline stroke mode is an amazing feature. But still, If I need to manually cut and fill the intersections this ain't gonna work while making a solid from a big illustration with lots of strokes. Anyway, thank you for your answer $\endgroup$ Mar 13, 2023 at 11:51
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The one working workaround I have finally found:

  • Turn on the Freestyle SVG Import/Export plugin
  • Export Grease Pencil strokes as an SVG
  • Convert exported SVG with strokes to an SVG with pathes (I googled "svg convert stroke to path online" and clicked the first link)
  • Import the converted file back to blender, but not as Grease Pencil, but just as a curves collection. These curves are closed polygons of the strokes preserving their thickness, so they could be easily joined with Ctrl+J, then Tab to edit mode, a to select them all, e to extrude them.

But still this looks ad-hoc and need additional external tools to be used, so I'm still seeking for a clean solution just inside Blender.

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