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Is there any way to subdivide an already created mask. I'm working on a project where I have already manually masked about 50 frames (about 2 hours' worth of work), when i realized that there aren't enough vertices (is that the word?) in the mask. Is there any way to fix this without just making a separate mask?

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    $\begingroup$ What would the drawback be of creating an additional mask? When rotoscoping complex shapes, having multiple masks for various parts is quite usual. $\endgroup$
    – Leander
    Commented Mar 28, 2019 at 14:49
  • $\begingroup$ For this particular structure I'm rotoscoping a person, and don't have enough verticies for the legs, so I don't really know how to make it not look super awkward to have two separate masks $\endgroup$ Commented Mar 28, 2019 at 15:23

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You should not be afraid of making more than one mask. It is a lot easier to rotoscope using multiple masks for different sections. Work with simpler shapes, they are a lot easier to manage than a single, larger, more complex one with lots of vertices (or control points).

Having multiple masks will allow you much finer control: you can turn some on or off, vary the feathering and have detail only where you really need it.

See how many masks are used in the following video: https://www.youtube.com/watch?v=NR9w2TRWRlI

or:

enter image description here

You can combine different masks directly as layers

as done in this video https://www.youtube.com/watch?time_continue=482&v=5ZnJLLB1P4M

Or you can combine them in the compositor.

Use a color mix node to subtract, multiply or combine different masks in different ways.

Related: Separate Masks in Node Editor

Another tip is to use the tracking tools in blender and associate the trackers with point of the mask to automate the process.

See:

Is it possible to take a mask clip and 'connect' it to a specific point on a moving object?

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