Animators
do many things to CGI animations to make things entertaining. Many things that
they create are really unrealistic when you take a look at physics. Cartoons
and video games are known to have whacky, funny, and crazy things happen, but
this is all to entertain the audience. When we do take the laws of physics into
consideration, we can see what actually is so unrealistic about scenes.
In
the scene of Space Jam when team Looney tunes plays basketball game against the
Monstars. One of the players named Stan, is actually a human in this Looney
Tunes Land. A few of the obviously large Monstars, (animated monsters) landed
on top of Stan. They get up leaving Stan laying there flattened like a pancake.
He then is pumped up with air by 2 animated characters, which resulted in him
floating up in the air like an balloon filled with helium. The air plug was
released and Stan propelled through the stadium like a deflating balloon.
The
issue here is with squash and stretch. Realistically, given that Stan is an
actual human, he should have died form the large amount of force of impact. He
would’ve been squashed like a bug due to the momentum of the Monstars landing
on top of himinstead of stretched like pizza dough. No human body can stay
together after something like that.
Another
issue has to be how he was pumped up with air. First of all, a human cannot be
pumped up with air like a balloon and have the effects as if it was helium.
Realistically the Stan’s weight should have held him to the ground because air
is not a force that will lift him off of a surface. Air resistance would not
have lifted him up because his body mass was more powerful. His whole body
would not have formed the shape of a circle because the air would have only
caused pressure in his lungs. His lungs would’ve bursted in his chest killing
him.
The
Space Jam film animators did a great job making these situations somewhat
believable, but looking at it from a real world stand point, it’s really
impossible for these things to actually happen. This movie gives viewers
entertainment in a new way, so having cartoonish things happen to humans is
actually not looked at as fake in this film, its believable.
Another
scenario from a CGI animation that doesn’t make sense in real life is the
Skadoosh scene in Kung Fu Panda. Panda and Tiger get into a heated battle, and
Panda wins with in an unrealistic way. Tiger lunges at Panda from a long
distance after gaining much momentum. Right before they collide, Panda lunges
belly first from standing still off of two feet and bumps Tiger so hard that
the force sends him sky rocketing straight up into the air.
This
scene is not really accurate when it comes to momentum and force. In the real
world because there is no way Panda’s feet can create that much force to send
an object as big as Tiger flying sky high out of sight. It is believable in an
animated since because he did have special super powers, but realistically,
those powers wouldn’t have this type of effect. You couldn’t see the apex of
Tiger because he was so high in the air, but it did take around 12 seconds for
Tiger to come back crashing into the ground.
Once
Tiger crashed into the earth’s crust, a hole shaped into a body was imprinted
into the ground. The issue here is that in the real world, the body would’ve
splattered like an egg. There’s no way the force of gravity will leave an body
shaped hole in the ground as deep as portrayed in the clip. Although this scene
is not realistic, it is an animation that is believable. No one wants to make a
cartoon character actually die like that and actually show the blood and guts
flying. It’s catered towards a young audience and makes them laugh.
Here
we have a scene from a video game – Grand Theft Auto 5. This CGI animation is
actually supposed to be realistic, however there are things that the game
allows users to do that is clearly unrealistic. There is a point in the game
where the character free-falls in the air. The only problem is the free-fall
looks more like a gliding motion. The character propels forward as if he is
wearing a jetpack. The sight looks like superman flying, which is humanly
impossible with natural force. The angle of the character’s path is way too
close to horizontal (0 degrees).
This
is an issue with the path of action. In the real world, a person freefalling
would obviously drop straight to the ground. This is due to the gravitational
pull from the earth, and the object’s mass. Air resistance can give an object
the ability to glide as well as other forces going against gravity. In this
case, the path of action was not realistic. This does add to the fun of the
game, giving the users a sense of what it would be like if people could glide
thorough the air like superman.
All
of these scenes have things that make them very unrealistic to physics in real
life. Animators obviously know what is possible and impossible, but the point
is to make the scenes believable in the world of animation. Having an CGI
animation with realistic physics takes the fun out of everything.