Monday, April 25, 2011

3Done

The matchmove and 3D work for the last shot is now complete.
The solve for this went exceptionally well with automatic tracking, I would put this down to the large amount of rotational information alongside the movement.
the geometry was reconstructed within boujou, then tuned to match the area and fix geometry errors within Maya.
The particle effects were creating by starting by creating a ball of particles around a newton field, then setting that as the initial state.  The first attempt to do this was by filling a sphere with particles, however the system I was using for randomising the instanced geometry was dependant on assigning a random number to each particle at the time of creation.
The ball was then exploded out of shot using an airfield, with gravity turned off for the first few frames of the explosion to facilitate a wider range of movement in the particles.

The final brick flying past Andrew head was animated along a motion path, adjusting the keyframes of the path in order to directly position the brick as his head turns.

Once rendered, and with the footage bought into After Effects Andrew needed to be masked out as he passes in front of the particles.  This was achieved through assigning a number of colour keys sampled from the grass, and a luma key to catch the darkest areas.  The mask is not 100% accurate, however given the amount of motion in the scene the inaccuracies are not noticeable.

In order to make the cut between this shot and the previous, "Wall To Andrew" shot, I used the frames where the ball of bricks entirely fills the shot, rendered the frames after it with transparency and timed the explosion of the bricks to the cut.  There is a noticeable jump in the position of the camera, but the combination of the cameras motion and the timing of the explosion meant that the experiment worked.

With all of the 3D work now complete, aside from a possible bit of re-rendering, or some additional two dimensional effects, the only work left is to fine tune the editing and add in more audio.
Here is the piece in it's current state, complete with updated Wall Pull (added fluid effect) and Outro (added background bricks, rendered from the Roll shot, but from a different angle.  The masking for this was a bit more complicated, as the shot was static.  It initially uses a difference matte to capture the majority of Andrew, touched up by hand painting problem areas frame by frame).

1 comment:

  1. Dude, you rock at this!

    You're as good as employed after you graduate.

    ReplyDelete