VFX1 DD1410: Forest Fight Sequence

The forest fight sequence is simpler than the altar sequence because it only has one blue screen shot, and the rest that need something done to them are all roto shots (the link for the brief for this piece is below).
http://www.darthspockvfx.blogspot.co.uk/2012/10/vfx1-dd1410-brief-02-fight-and-forest.html

The main difference with this piece is that final few shots don't need anything done to them, they just need to be talked about in a blog post. This blog post will just be talking about the shots that actually need something done to them in Nuke, starting with the roto shots.

Shot One shows a guy walking through the forest, carrying a container, the brief states that his hand, the container body, and the glass of the container, needs to be roto'd. Using a tracker was attempted, but a good enough tracking point couldn't be found, so when the container changes its place during the footage, the roto may need to be moved by hand.

A video of this shot is below:

Now the container needs rotoing. What's important to note is that a separate roto need to be made for the hand, the container and the container glass. See pictures below:

After the rotos have been made, they must be altered so that they follow what has been roto'd. See the videos below:

The next shot that needs rotoing is Shot Three, it is basically a close up of the shot from before. The footage for this shot is below:

The same needs done as before, the hand, container and container glass needs rotoing.
For the hand roto, the forearm has also been roto'd just in case the director wants any glare/glow off the container glass onto the forearm. It wasn't roto'd in the previous shot because the shot shows him from a distance.

Now on to Shot Four is another close, this time he is walking directly towards the camera.

Just as before the hand, container and container glass needs to be roto'd.

Also a hold out matte needs to be made for the background elements.

That is it for the roto shot, the final shot is the Shot Two, the blue screen part.

Lets start with the simple part, a hold out matte needs to be created for the container.

This time, rather than using the Keylight node, the IBK Keyer node is going to be used instead. To begin with, read in the IBKColour and the IBKGizmo.
They work in a similar way to the Keylight nodes. A picture of what needs to be done with the IBKGizmo viewed in the alpha is below:

What needs to be done with the gizmo is to get the background as black as possible, and the character and branch as white as possible.

The IBKColour works in a similar way, except this time is all about getting the character as black as possible. The Colour is used to get all the detail around the charcter and objects.

Next read in a background image, reformat it to the size of the footage, and merge it to the gizmo.

Now the image should fit perfectly on the blue screen without any spill.

And that's it for this piece, the only tricky thing about this piece is the rotoing, because if a tracker doesn't work then it can be very time consuming to move the roto through the different shots.