We all know the lovable monsters from
Disney's Monsters Inc. This time around, the prequel Monsters University takes
us back in time when Mike and Sulley met each other in University as young
monsters. The story follows Mike and Sulley hating each other's guts until they
got over their differences that ignited a friendship that would last for a
long, long time.
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Monsters University completely changed
the way animated films were lighted up since the first Toy Story film, until
its planning stage where director of photography Jean-Claude
Kalache asked, “What if we made these lights just work?” Thus, ray tracing was
introduced into the filming production of Monsters University. Before its
introduction, artists were forced build the reflections and shadows of the
models manually. This in itself was a feat for the lights effects previously
seen on characters like Sulley. In the past when it came to animations, ray
tracing was only used in Cars for a few very specific parts, and that too was
described as “clunky” due to the limitations of both software and hardware. The
major difference that brought such realism to Monsters University was the way
that ray tracing works.
Before ray tracing,
the light and shade conditions were mapped out manually by the artists. But
with ray tracing, every ray of light and its reflection is calculated in an
automatised manner. That isn't much considering the technology was used in
films such as Iron-Man and Transformers where partial-CGI environments used ray
tracing. Monsters University, however, was more ambitious: the entire film
would use ray tracing. Such an idea was always considered as a tedious and
time-consuming task. If the first Toy Story started processing its ray tracing
with the hardware available back then, it would still be rendering to this day.
The challenge was to keep the processing of
each frame down to 20GB. The computers at the render farm of Global
Illuminations had only (!) 96GB of RAM available for rendering each frame. The
tricky part was that they had to process four frames at once. If anything went
a little awry, that would mean an overnight render of the sequence yet again.
And it took 2 years for Monsters University to render in total after using over
a hundred CPUs. Global Illuminations, however, ironed out the creases as much
as they could by introducing simplified no-nonsense light sources into the
environment. This gave the artists a lot of freedom to play around with the
lighting but at the same time, it holds true to its naturalism. Do the viewers
notice such a huge upheaval? Most probably not, as Kalache’s puts it,
“successful lighting is silent lighting.”
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