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A
Anonymous
July 26, 2018
Question

Roto Brush selection dissappears ever 10 frames or so...

  • July 26, 2018
  • 1 reply
  • 7612 views

I didn't know when i made a selection with the Roto brush that is would only keep the selection for about 10 frames...

I naturally am tracking frame by frame given After Effects limitations, and still after only 6 to 10 frames the section will disappear completely... leaving me to redraw the selection, which After Effects never understands, naturally, leaving me to use the red brush to make the exact same selection I made with the green brush... so I try to only use the red brush the first time.... it doesn't work like that. So ever 10 frames I have to stop, redraw the selection, then re-redraw the selection.

So... why?

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    1 reply

    A
    Anonymous
    July 26, 2018

    Well, a few minutes later ... about 15 seconds into rotoing a shot frame by frame, I accidentally turned the part of the screen that isn't selected black. No matter what I tried in the options I couldn't undo this and get the original view (which you NEED to be able to ROTO, something Adobe might need to learn).

    Anyone know of a program similar to AE that WORKS????????

      Roei Tzoref
      Roei Tzoref
      Legend
      July 27, 2018

      the default duration of rotobrush  span is 20 frames forward and back from your base frame. If you correct a stroke, you will get it to automatically expand to 20 more frames. You can also drag the in/out of the rotobrush span edges to make it last longer. If you set your CTI in an area outside the rotobrush timespan you won't see any effect and the result could be black depended upon your boundary view.

      All this information is documented in the help files and the links Szalam has very kindly provided for you, investing minutes of his time for free out of his pure generous soul.

      A
      Anonymous
      July 27, 2018

      I would guess the logic is this: rotobrush is very CPU intensive, you definitely don't want to set your CTI so far forward or backward from your cached corrected brush strokes. and you usually correct a stroke every few frames at least so there is no issue since it automatically expands the rotobrush span after that BUT as I mentioned,  in a simple action (that takes one second) you could expand it to whatever duration you need in a similar way you expand your timeline workarea.


      Actually i know for a fact the other times I've used the roto brush it didn't dispensary every 20 frames, so it didn't do this last time.  Also opening the selected clip to start rotoing it didn't even open then clip in the correct section relative to what was in the comp.

      After Effects doing roto is like Homer Simpson making Liza's Florida state costume... they don't even know what rotoscoping actually is.

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