roto brush looses its render as it renders

Forum|Forum|6 months ago
September 28, 2025
2 replies
152 views

So - I'm new to the roto brush and am having an issue. As my 20 second clup renders, the render behind the playhead gets lost - meaning at say the 10 second mark, everything the green line behind will disappear. This continues to happen as the playhead moves on.

Any sugestions as to what could be casuing this?

Correct answer patrickh27764550

OK, after more investigation and more learning, I don't think it was being lost, it was just no longer cached. When I froze it it froze properly.

Thanks for the response.

N

norsmarsh

Participant

I have similar problem and that my render only keeps the render for four seconds as the green line moves on four seconds behind disappears. I can render and freeze a four second clip but I can't render/freeze anything longer than that. I thought maybe it had to do with the memory of my cache but it doesn't seem to be the case. I have a feeling it's something to do with memory but I can't figure it out.

Warren Heaton

Community Expert

@patrickh27764550

Sorry to hear that you are having trouble.

When you are done with the Roto Brush in the Layer panel, are you licking the "Freeze" button at the lower left before continuing to do anything else in After Effects?

After Effects User Guide > Drawing, Painting, and Paths > Roto Brush and Refine Matte

patrickh27764550AuthorCorrect answer

Inspiring

OK, after more investigation and more learning, I don't think it was being lost, it was just no longer cached. When I froze it it froze properly.

Thanks for the response.

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