Sorry to be a nuisance.
Ive worked through my previous problem. I now have a isolated video layer through rotobrush which i have frozen once im happy with the rotobrush process.
Back on the main composition im trying to delete a small area of these using a mask. I draw a mask layer on the layer in question but it doesnt hide/reveal as would be normal behaviour.
Is it something to do with the 'freeze' rotobrush state?
Sorry to be a pain
Apply the mask to a solid on top and reference that solid as a Alpha matte. Or pre-compose the RB'd stuff and apply the mask to the pre-comp layer.
how do you know all this stuff!
any tutorials on this anywhere?
the precompose comes up with some pain in the neck rotobrush frame issue
and im struggling with the solid alpha mat thing