To have an image to comp over Blu I rendered out one from of the mountain top form the base plate with alpha and masked this in veracious ways around Blu to make him look as if he was sitting in and compressing the cotton wool:
Before:
After:
Before:
After:
There is a significant difference between the two images. Now he looks like he is sitting in the cotton wool while also creating shadows around him. I think it worked really well and didn't involve any extra tracking as I placed it in the Pre- Comp along with Blu who by this stage is already tracked.
I also added a mask to remove the plants of the mountain which where creating a noisy edge. this again was created using a tracked sold which was masked.
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