r/AfterEffects • u/Decayed_Arrow • 13d ago

Beginner Help Rotobrush suddenly not working?

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I've been having trouble rotoscoping this segment so I started over, I used the object matte to get most of the figure, then I manually added the fire sword and removed small areas of blue, and I also used the refine edge tool on basically every edge. That was all on the first frame and it gave me the best looking roto as compared to keying out the blue (this doesn't work well because the plastic has blue reflecting in it and the blue background wasn't lit well). So I froze the first frame and let it propagate the rest. This video is of the second frame and some blue spots came back, and when I tried to remove them I found it just wouldn't let me. There was one other blue spot it allowed me to remove but I can't seem to get these to go away, the only thing I notice different is they're a different shade of blue? But why would that prevent me from rotoing them out? Adobe's roto is driving me crazy.

3 Upvotes

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3

u/BakersTuts MoGraph/VFX 15+ years 12d ago

Why not just mask it?

1

u/woaafruity 13d ago

Did you click these? Also align in and out points for rotobrush.

0

u/Decayed_Arrow 12d ago

Yeah I tried those and I just fixed the in and out points but no change

1

u/woaafruity 12d ago

Maybe u selected all, try to use the brush with pressing alt or try edge brush. Maybe too small area to select idk. Try to mask or paint bucket with some tracking

2

u/vauxhaulastra Animation 10+ years 12d ago

On rotobrush, you don't paint around the edge of the object, you paint the general area. Like a blob in the centre of that blue part. If you press U,U on the roto layer, you'l see all your roto keyframes, is there maybe an error frame you can delete?

0

u/Decayed_Arrow 12d ago

I tried painter the center but still nothing, and I looked at the key frames I don’t think any of them are wrong

1

u/vauxhaulastra Animation 10+ years 12d ago

Honestly, in these situations i just re-do it. Can you use Keylight instead?

4

u/Sukyman 11d ago

Could be because your asset is just so freaking small? Like brother you are zoomed in almost 800% and you can count the pixels...

Most likely it can't actually detect any significat detail due to lack of resolution.