Meanwhile on his own time he "taught himself Photoshop, AfterEffects", and started "doing commercials" on a desktop box. Later he became "comp lead and supervisor" on Harry Potter - doing the Hippogriff - the film that "proved that London could do visual effects". Then he was supervisor on the second Narnia film. Later Christian did Dobby for Harry Potter - around 90 shots.
As creative director, Christian helps to "guide less experienced supervisors" at the company, doing the test work "which got them Beauty and the Beast". And two years ago he "got the job to do Fantastic Beasts".
Christian worked with animation director Pablo Grillo to come up with the visual style, submitting ideas to director David Yates. Today, VFX is "not just post" - they're "involved from the beginning".
Newt's Case itself (ie the magical suitcase in the film) required a lot of thought - how would the creatures get in and out of the case? They did rough pre-viz animation to show how it might work.
To get the actors in and out of the case, they ended up cutting a hole in the floor of the set, so the actor could drop through the hole, just like the silent film actors did back in the 1920s.
JK Rowling also had a good deal of input into how things should be done - as Framestore pitched ideas for how the interior of the suitcase might look. Soon they developed the idea that the case interior might be "like a bio-sphere". Sort of like a "magical zoo", with "dioramas". They had a "room full of boards" presenting ideas, and pitching material for the story. The process was "amazing, because you don't get to be part of the process like this too often". Framestore did the pre-viz at the same time as Production Designer Stuart Craig (a Potter veteran) "designed the set", so there was a lot of "mutual interplay of ideas".
Many companies worked on the film; sometimes "up to five companies working on a single shot", and things could get "pretty emotional". This involved "bouncing terrabytes of data" from one facility to another.
For the Niffler, the visual development team looked at Honey Badgers, and the duck-billed Platypus. Animation director Pablo Grillo drew sketches of what the character might be able to do, coming up with visual gags for the character.
Pickett the Botruckle
Pickett the Botruckle also involved a lot of development work - over 200 designs. At one point, Warner Bros didn't like the design, so Framestore showed the studios executives all the variations that they had created, showing how they had arrived at the final design. In the end, Warner Bros agreed to the original version - but made it green!
Gnarlak the Goblin
They filmed the actor, basing the animation heavily on Ron Perlman, using him as reference for the final character. Mo Cap data was used by the animators to create the final animation.
New York City
The live action for NYC was actually filmed in Watford, partly because New York City "has changed a lot". However, the team went to NYC and "filmed all the buildings they wanted to use", building 3D sets.