Simple blender addon that adds an option to reproject Grease Pencil strokes for all frames at once It's the equivalent of executing "Grease Pencil" -> "Cleanup" -> "Reproject Strokes" for every single frame.
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Download gp_reproject_all_frames.py and save it to your computer.
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In the Blender Preferences go to Addon, then click "Install" and select the downloaded file.
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Check the checkbox to enable the plugin "GreasePencil: Project to View for all Frames"