A new way to generate a Grease Pencil object based on an animated Mesh has landed in the greasepencil-object branch! Think of it as a kind of "bake", where the edges become strokes (and materials, fills). This feature is under development and expected to land in time for Blender 2.90.

Support Blender development: https://fund.blender.org

Download experimental builds at https://builder.blender.org/download

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