Original subtitles

- In this video, we will talk

about another principle of animation.

I haven't used the term before,

but we have already used arcs in our animations

when we have done our one single animation,

and when we were tracking the motion of the ball,

we did our best to create those beautiful curve

in the motion, and those are arcs.

And it does make sense, even for me,

as an arc, in French, is a bow.

But, I'm not sure it will help for this course.

Let's go ahead.

If you look around, most of the things that move

move in arcs.

They kind of have a rotation-based motion

and you will barely meet situation where you want

to animate straight lines

like hydraulics or stuff like that.

If I remove the arcs from our one single animation,

you can see that we absolutely don't get the same results,

the same feeling.

It doesn't look natural at all.

Let's have a look at a little more complex animation

and let's point out few arcs in this animation.

A common mistake for beginners is to forget

to input an arc in the head rotation.

But in most cases, it will bring a bit more personality

if you do it this way.

Next step, if I track the hand,

you can clearly see there is a big arc on the left hand

and the right hand.

On this new head turn,

look at how the arc support the feeling of fear

of our character not understanding what happened

and his back is pushing his head down

between his shoulder while rotating.

On the next move, too, arc is very important

and well-defined.

And whatever part of the character I am tracking,

I will find those arcs,

whether it's the motion of the pelvis,

the motion of the hands,

the motion of the head, the feet, whatever you want.

So arcs are almost everywhere

and it's very important to track them properly.

That's why we really need

to use the motion path tool of Blender as often as possible.

To summarize, we have seen that most motion are done

in arcs.

You should avoid the straight interpolation

unless it is intentional.

You should use the motion path tool of Blender

as often as possible.

Track your arcs!