Using Mocha Pro Open Spline with Re:Vision Re:Flex

I came across Mary’s tutorial about using Mocha open splines with Re:Vision Re:Flex

But, similar to the last comment in that video, I’m trying to apply the technique to a Motion Morph, so using 2 pieces of footage, and a To and From spline. I have Clip A and Clip B imported into Mocha, but on the Track tab it only lets me select Clip A, and if I select Clip B in the viewer window, the splines go away. I would like to be able to keep the same splines, but switch the footage between clip A and B so that I can duplicate my spline so that it has the same number of vertices in the same position.

It seems like this should be possible with the way Mocha allows multiple clips to be added, but I can’t figure it out. Any ideas?


You’d need to reimport the footage into a new file to do this. Or you’d have needed to set this up as a stereo shot as a cheat, which it sounds like you did not. You can make a new file with your other footage and merge your old file into it as a workaround though.

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

Thanks for getting back Mary. Would you mind describing the setup? Specifically I’m looking to use the splines in a Motion Morph in Re:Flex for After Effects, so feel free to be specific to that workflow. I will be so stoked if this actually works.

I thought you were asking about the mocha tracking splines on two different clips, not how re:Flex works. In theory, with re:flex, you should absolutely be able to warp but it’s been a while since I dug around in that plugin. If you email me, I will connect you with their product specialist.

No I understand how Re:flex works. I’m talking about the process of of tracking and creating splines with 2 different clips within the same Mocha Project.


Your best bet is going to be to try to merge the shots.

  1. Make a new file with the new footage.
  2. It has to be the same frame rate and aspect ratio.
  3. Go to file>merge Select the new footage and load it.
  4. Reposition the shapes onto the proper places on the new face.
  5. Retrack your newly moved shapes based on the new data in the shot.
  6. Your splines should be approximately in the same place.
Otherwise, you can try to set up a stereo workflow but with two different shots of two different things it might now work correctly.

This is the best blind advice I can give.

You may have to combine keyframes to get this to work correctly when you combine the shots.

Hmm, I’ve imported the project, but I can seem to get the shapes to track on the new footage. It seems to be just ignoring the footage when it tracks.

If you don’t turn the gears on in your layer controls then layers wont track.
Also, mocha treats everything in the top of the layer pile as closest to camera and at the bottom of the layer pile as farthest from camera, so it holds those layers out from the layers beneath them, you may need to adjust layer order.

You also might need to make sure that your frame rate is the same for the target shot.

Alternately, you can trace the shapes you have now and delete the old ones.

If none of that works, it’s probably best to email me a screenshot and move this to a support case.


Yeah tracking gear was active, and all other layers turned off so nothing was held out.

Luckily in this case all my shapes were parented to a control shape, so I ended up having to retrack that from scratch, and reparenting and the shapes lined up.

But still, shame that it didn’t work just by merging the project and going from there. Perhaps you can look at the project and see if it works on your end.

Ultimately though, I don’t think this is the way to go when trying to do Motion Morph with Re:Flex. You mentioned about setting Mocha up as a stereo workflow? I wonder if that may be an option. I feel like, for a workable solution we have to be able to have both the FROM and TO shots in Mocha at the same time.

Are you familiar with using the Motion Morph aspect of Re:Flex? I would love to be able to hammer out a workflow with using Mocha to create the splines instead of After Effects. I think that would make the morphing functionality SO much more effective, because the ease of creating great splines in Mocha, and the Uber tool which allows offsetting, both of which aren’t really possible in After Effects in a slick way.

I think some tools we are coming out will better suit you, right now we only have “workaround” workflows for this sort of thing. For stereo, the shots would have to match up more than they likely do.