Suggestions on Extending a makeup line through a shot

Hey guys,

Im currently working on a movie for a company, Ive already done a few shots, and this ones not particularly hard, i just want some suggestions on some ways to go about doing it.

The movie is a zombie movie.

THE SHOT:
A zombie is chasing the main character into some water – either the make up artist missed some, or the zombies pants got lower from the weight of the water – but he is shirtless and is covered in makeup to make it look like his flesh is green and decayed and dead… zombie-like. The problem is that there is about an inch band around his waist before the pant line that has no makeup, and is just regular skin.

My job is to extend this decayed flesh look down.

USED:
Nuke 6.2
Pixel Fudger gizmos

Unfortunately i cant post any pictures or footage etc for obvious reasons… but heres what ive tried.

I love the Pixel Fudger plugins – I tried using the filler (basically just blurs in the edges of a mask. for this shot. As a 1 frame test i rotod the area that needed to be covered, used the edge blur inward, did some sharpening and color correction, and added a procedural noise to texture it like the surrounding flesh. This worked BEAUTIFULLY… for one frame. The problem is no matter how tight and specific you roto, even if its every frame, you get this ugly crawl in the blue because of the colors its blurring in. ANOTHER problem with this is that the noise, being a full project sized still, and the zombie is moving across frame, it animates through the flesh. Obviously this can be fixed somewhat easily but i didnt bother to put in the time, as this method Doesn’t seem to work well enough, thinking on a result to time consumption basis.

Anyone have any other suggestions?
I would just be interested to hear them and see what i can work out.

ALSO before someone suggests it 0 I tried using a luma key for a matte, but the flesh isnt much brighter than anything else, and changes color, so despite color correction and luma level tweaking, it doesnt cover the whole area i need, without introducing stuff i dont want.

(applicable software at my disposal – Maya, Nuke 6.2, syntheyes, pf track, mudbox, photoshop. We have more but i dont think things like houdini are particularly useful here xD)

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