Mocha approach (noobish question)


My name is Andy and I’m a veteran CG generalist. One thing I’ve never really needed to do in my career is do much rotoscoping…until now. I’m looking into Mocha Pro and was wondering what the proper approach would be for taking out a windshield, side windows, etc (image attached.) I’m attempting to use AE roto brush, but the results are less than stellar. There is a bit of hand held shake and the car is moving forward. I need to take out the current environment and replace with another (all windows).

Is this something I would track, than apply layers of masks (animated, since the actors turn their heads, etc) and attach those masks to the tracked layer? Or is there a simpler way?

Any insight is greatly appreciated.



You’re actually better off rotoscoping the actors and car and putting them back over the new windows footage. Everything left will be window information. When you roto in mocha, you track first, and then make complex shapes attached to it. Using this process, mocha guides the roto and you just have to make corrections.

Good tutorials to start with are:

Let me know if you have any questions and I will be happy to help.


Great! Thanks for the feedback :slight_smile: This helps immensely!


Hi Mary,

Your insight was VERY beneficial and thank your for the help. I was wondering (again) if you may have some insight on this shot. Around the 4 sec marker there’s a member of the crew in the shot and he runs out of frame. Now, I’ve been trying to do all the necessary removal protocols while attempting to retain good tracking info. If this shot was on your plate, how would you approach it? Is this something I need to remove the vans shadow first? I’m getting some pretty bad artifacting due to that moving shadow.

Any help is greatly appreciated! Thanks :slight_smile:

PW - 031


Your best results might actually come from mocha Import+ with this one. Boris FX | U.F.Oh Yeah Paint: How to Stabilize and Roto Paint in Nuke using Mocha Pro and MochaImport+

Please note, this workflow also works in AE, not just nuke. It will make your life so much easier to paint it this way.

Remove is going to not give you perfect results, too much non-planar information moving behind the crewman, unfortunately.

Try that?

Brilliant! I’m on it :slight_smile: I can normally R&D this stuff myself, but time is not on my side and doing removal of this magnitude is something that doesn’t come naturally :slight_smile:

Thanks again!