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enter image description here

I think this effect can be done with Blender grease-pencil.

I understand 3D tracking camera and object.

But how to record the drawing process in Blender?

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  • $\begingroup$ Your question is alredy pritty good. You can even improve on it to edit your question in a way that it fullfills the last criteria of a good question blender.stackexchange.com/help/how-to-ask . And accept answers that solved your question. $\endgroup$ – J.Doe Oct 16 at 7:00
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After using the greas pencil to create your drawing, you can use the build modifier to animate the draw-in along the stroke.

draw in effekt grease pencil build modifier

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Yes, the grease pencil objects are fully 3D, so you have to create the drawing, track the camera, render on a transparent background (a sequence of PNG images) and composite them onto your live footage.

enter image description here

You can also create a 3D mesh and use it as surface, to guide your strokes, enabling "surfaces" as stroke placement.

enter image description here

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