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dv8kiwi
dv8kiwi
Inspiring
April 1, 2023
Answered

applying echo to an object isolated with rotobrush

  • April 1, 2023
  • 1 reply
  • 890 views

This is a strange problem. I want to isolate and track a ball then apply an echo. I isolate first then add echo. 

When I add the echo with a negative time value the ball loses its rotobrush isolation and the and the echo is applied to the entire layer. Strangely when I add a positive value the echo works on the isolated area as expected. Of course I want the echo trail to follow the ball not precede it.

Any ideas why this is happening and any other possible ways to acheive this?

Thanks

This topic has been closed for replies.
Correct answer Rick Gerard

You are running into a render order problem. It is easy to solve. After you isolate the ball using Rotobrush, pre-compose the layer, then apply Echo to the pre-comp. If it took more than a few minutes to create the Rotobrushed ball layer, pre-compose, then use the Composition menu to  Pre-Render the layer. This will add the Roto-pre-comp to the Render Que, then render a lossless with alpha movie and replace the pre-comp with the rendered ball. Your AEP file will be more stable, and the file size will be much faster. The final comp with Echo applied will also render faster.

1 reply

R
Rick GerardCorrect answer
Adobe Expert
April 2, 2023

You are running into a render order problem. It is easy to solve. After you isolate the ball using Rotobrush, pre-compose the layer, then apply Echo to the pre-comp. If it took more than a few minutes to create the Rotobrushed ball layer, pre-compose, then use the Composition menu to  Pre-Render the layer. This will add the Roto-pre-comp to the Render Que, then render a lossless with alpha movie and replace the pre-comp with the rendered ball. Your AEP file will be more stable, and the file size will be much faster. The final comp with Echo applied will also render faster.

    dv8kiwi
    dv8kiwiAuthor
    Inspiring
    April 3, 2023

    Thanks, that will definitely fix it. But I am having problems with pre-comp. I have a 2.25 minute clip but precomposing the rotobrush layer is taking hours. I did the actual render of the layer, which is the solution, and it took about an hour.. Any idea why precompose is taking so long? And is there anything I can do to track the progress of a precomposition? 

    R
    Rick Gerard
    Adobe Expert
    April 3, 2023

    You probably did not freeze Rotobrush so it had to recalculate. You may also have failed to check the box that says to move all elements. 

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