When use a "Rough track" to guide a roto track?

Hallo everybody,
I saw many tuts in which people make a direct Roto Track of an object/person to mask, remove, etcetera…BUT also many tuts which is suggested to make a preliminary “Rough track” which will guide the precise Roto track later done. (The Roto track will be linked to the Rough track)…
I ask in which cases we can make directly a Roto track and in which case is suggested to make a preliminary “Rough track” to guide the further RotoTrack.
Thanks for a glad reply!

When you’re tracking a fairly simple shape it’s safe to use the same shape for tracking and rotoscoping at the same time. Simple curves like edges of the face or individual fingers are a good example of when you can use the track shape as the roto shape. Or especially objects like cans or books or tables.

But when you’re tracking a really complex shape it’s better to do a basic track shape and then link a roto shape that’s more articulated to that. So for things like cloth sleeves and other complex edges you’d want to do a basic track first and then link a complex roto shape to that. If you need a whole lot of detail it’s always better to link to a track because you have more control over your roto shape. Because the best shape to track with isn’t always the best shape to roto with.

You also can use a track shape instead of a roto shape first when you’re tracking something to rotoscope that has lots of occlusions or reflections or lighting shifts. In this case you need to use your tracking shape to avoid problematic areas.

Hope that helps,

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Very good explanation,
many thanks Mary!