GPencil: Convert and Bake mesh animation to grease pencil strokes

This patch adds two options:

- Convert a mesh to grease pencil strokes.
- Bake the mesh animation into grease pencil strokes.

Both are related and must be included in the same patch.

Related to tasks: T77629 and T77630

Notice: The conversion is done for mesh edges and it's not considering any visibility clipping. All edges are exported, no matters if it's visible or not.

Example of Convert a Mesh to Grease Pencil strokes:

{F8606028}

This conversion was inspired by the technique used by @luamono in this tweet: https://twitter.com/luamono/status/1239983662176841730

Example of Bake Animation (the video is a little outdate, but the basic functionality is the same, only small changes in UI):

{F8606032}

Reviewed By: mendio, pepeland

Maniphest Tasks: T77629, T77630

Differential Revision: https://developer.blender.org/D7983

1 files changed, 1 insertions, 0 deletions

diff --git a/source/blender/editors/gpencil/gpencil_ops.c b/source/blender/editors/gpencil/gpencil_ops.c
index 94c86572fd3..7b92426efd4 100644
--- a/source/blender/editors/gpencil/gpencil_ops.c
+++ b/source/blender/editors/gpencil/gpencil_ops.c
@@ -603,6 +603,7 @@ void ED_operatortypes_gpencil(void)
   WM_operatortype_append(GPENCIL_OT_frame_clean_loose);
 
   WM_operatortype_append(GPENCIL_OT_convert);
+  WM_operatortype_append(GPENCIL_OT_bake_mesh_animation);
 
   WM_operatortype_append(GPENCIL_OT_image_to_grease_pencil);