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Re: Isolating reflections on bus advert for mocha replacement

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Roland R. Kahlenberg
Re: Isolating reflections on bus advert for mocha replacement
on Jul 9, 2012 at 1:01:19 pm

Hmmmm, kinda PIA to do this but here's what I would do -

1) track with mocha

due to lots of movement on the reflective surface, judicious use of mocha splines will be in order to get a good track. however the edge/outline of the bus should provide good, though not necessarily usable on its own, track - hence multiple splines either on a single layer on on two different mocha layers will be required.

2) use a single frame to create a clean plate as well as the insert element

about 1/3 into the clip is where the side of the bus provides itself with its largest resolution. this is where you export your frame (in AE) and create your backing plate as well as your insert element.

3) use mocha's Align Surface feature
go back to mocha and use its Align Surface feature on the track done in step 1. VERY IMPORTANT - make a backup (copy - just in case) of the track in step 1 prior to applying Align Surface.

4) export mocha tracking data to AE
a)apply tracking data to clean plate
b) apply tracking data to insert element(s)

Up till now, if all is good with the tracking results and your insert elements, the only oddity is (c) the lack of reflections AND (d) the change in the red bus's hue as it drives by.

5) look for stock photos of trees and use that with the tracking data in conjunction with Blending Modes + Opacity. Feel free to duplicate the tree image to create multiple versions with varying Blending Modes and opacity levels to achieve the desired result.

BTW, you should be able to eye-ball the amount of movement required for the reflection (ie the trees). Ensure that the movement is in a precomp and that mocha's Corner-pin data is applied in the 'final comp', as per the other mocha Corner-pin instances.

6) I think I've covered the requirements decently but take note that the technical aspects can only get you so far. The end result really depends on your eye/perception for pace and colour. To this end, you should take note that the job isn't to replicate what was in the original shot but to make things look good/believable.

BTW, do check with the Imagineer Forum - just to double check as well as to enquire on the merits of mochaPro's Remove/Insert Module, which are automated procedures to create Clean/Insert plates.



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