Roto Brush - is there a way to just 'paint' a selection - if it doesn't pick elements automatically?

[Hugh Betcha]

Roto Brush - I'm working on selecting an object moving through a machine assembly line - the Roto Brush 'automatically' selects the majority of elements I guide it to select, however some areas, simply won't select. I could obviously use a mask, but this won't give me the same 'organic' Roto shape I'm used to - is there a way to just 'paint' a selection, without worrying about Roto Brush selecting it?

[Mylenium]

Nope. It needs to detect at least a minor motion difference or else it won't latch on.

Mylenium

[ShiveringCactus]

Sounds like you're hitting the limitations of the rotobrush.  If you can mask it, but want a more organic shape, you could try setting the mask on a solid, using that as an alpha matte, then then apply the roughen edge effect to the solid.  That should allow for a less precise cut out.