Sky Replacement tutorial

Hey that's funny... I posted a reaction here but I think it's gone.

Anyway, what I said is that I have no idea if there are any advanced tutorials about this. Yesterday I happened to create an "advanced" sky replacement in a camera tracking test I did.

These are the steps involved:
- 3D Track your camera footage
- import your tracking data to your favorite 3D app and create a sphere with a panoramic cloud texture. (I simply took one of my panoramics I shot from my back garden).
- Render away and composite your cloud footage onto your raw footage. You might want to make a luma mask for the clouds though.

This is the way I did it and I couldn't tell the clouds were composited in this shakey footage.
 
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