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motion brings life to your 3d project
whether you want to create a video or an
interactive 3d experience
making objects materials and lights move
over time
is called animating for simple models
that's all you'll need to think about
but when models get complex
you have to prepare them for animation
that's what we call
rigging animating in three dimensions
is no different from animating in two
dimensions you just make properties of
an object
move over time 3d applications that let
you animate
have a timeline that allows you to play
back or slide through the duration of
your animated sequence
any property of an object can be changed
at any point
along the timeline a value change at a
specific time point
is called a keyframe and your object
moves because it
interpolates between these keyframes
when animation is played
for example to make your object spin 360
degrees
you create a keyframe with a rotation at
zero degrees at the start of your
timeline
then you move to the end of your
timeline and set a keyframe with a
rotation at 360 degrees
when the animation plays it rotates from
0 to 360 degrees
while time advances keyframing like this
is the easiest and simplest way to
animate but it involves a lot
of manual work so you might sometimes
want to use other methods to create
animation
it's also not always easy to create
realistic believable motion
there is a technique to capture movement
from something that moves in the real
world
it's called motion capture or mocap in
short
motion capture means the computer
captures that motion from the real world
and brings it into the virtual world
think of it like scanning but then for
animation
just like with scanning there are
different mocap techniques from running
smart algorithms on simple video footage
to using high-tech
expensive gear in studios each method
has its use
with more advanced methods being much
more precise and reliable
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some cases are almost impossible to
animate by hand or capture from real
life
things like smoke moving and building
collapsing or a machine exploding into
many parts
to animate something like this you let
computer algorithms calculate the
physics behind it
to simulate it as realistically as
possible
running simulations means you're not
doing any animation work by hand but you
set up and tweak rule systems
for forces like gravity and wind
making simple animations like spinning
an object or bouncing a ball doesn't
require any real preparation work
but complex objects always need to go
through an extra step before they can be
animated easily
that step is called rigging and it comes
down to building a virtual skeleton
and controls for it there are three main
reasons to build a rig for your 3d model
first your objects could be very complex
and consist of many parts
so much that it becomes impossible to
handle each part individually
think of a clock moving one gear at a
time would be tedious
but a rig simplifies this and lets you
control many parts at once
second with a rig you can deform a 3d
model when animating
think of it like bones with tissue and
muscle around it
a rig lets you morph bend and twist your
3d model
in ways otherwise not possible
third rigging lets you do movements that
would be very hard otherwise
for example keeping a hand in place
while the body moves around is hard to
do
but having a rig means your computer can
help calculate solutions for these tough
cases
think of it like moving an action
figures limbs one by one
compared to moving a puppet with strings
having a rig for your model
makes things much easier and faster to
animate some applications
offer services that can help you get
started quickly with character animation
and rigging they provide a library of
high quality animations
and rigged characters that you can
import and adjust to your liking
you