this is Evan Abrams and in today's After Effects tutorial we're gonna be
taking a look key frames the govern
position. And we're looking at a special kind of keyframe.
It's called ROVED keyframe. You know it's not like the linear or
easy eased keyframes right here but its
pretty different and it helps make things smoother
you now to make you into like a smooth guy a road
smooth girl there I guess you just shaved it
have that been host to do that was going in after effects and smoothed out
so hereinafter fax I guess I have to answer a couple questions
first what our road keyframes or roving
keyframes or keyframes which that Rome
for first a keyframe a something that holds information in this case
positional information and a roving keyframe
has no set time so this key frame here at the beginning
has a time and a place okay its time
is 24 05 at this
time it's saying to this layer
be at this position okay and this one here
similarly you know same deal it's got a time it's got a place
K these key frames here in the middle
they have positional data but they don't have
temporal data okay they just is K hang out
and they go wherever these two keyframes here at the
and tell them to go so we're gonna look here the graph editor real quick
and you can see that here on the graph editor feister polling this handle
these key frames start moving around
right and they move around you know one way or the other depending on the
influence
over these two keyframes at the end and that changes
the way in which this moves overtime think a bit like
stretching and skewing but with
time not space so everything in between
is moving in relation to these other two things
which is pretty cool when you want to create things like
to you knowing see how this would be a spaceship flying in and near
controlling the curve the speed of the spaceship so that's
pretty great but roving keyframes or played everything
and they can be a little bit new ones and tricky so I'm gonna take you through
making some and using them for some kinda perfect
so I was gonna go here in the project and create a new
composition call it comp to if you like
hard have some solids made so I'm gonna bring one out here to service the
background
I'm the creed a new shape layer
and within their shape layer I'm going to make
a circle morn a lip service something
so just a little circle just like that what we're gonna do with the circle
is move around its position so Colbert's position
by hitting the P perhaps a slight delay re hippie
making do with this position and I'm just gonna go ahead
much keyframes here I'm holding down shift in hitting
you know page up and down to move ahead ten keyframes
I'm gonna squirt the stopwatch here to create my first keyframe
and it has created a linear keyframe when your key frames are
diamond shape K I were tutorial although
keyframes the different types of keyframes this roving keyframe
was not covered in there so will create a linear keyframe cool
we're gonna go ahead writing the play head him to put
get over here Saunders dragging to create a new keyframe
now and move ahead a bit again go over here
when you move ahead again move down here
cool and move ahead again parade here
so that seems good so now we've got you know
this thing it's moving along this path in this way
so we've created these key frames in space I'm use like two key frame
you can grab these handles around it and you know
you can start to move it around you can affect to this
all line this half that the keyframe
is essentially gonna have things follow so that's
that's what we're doing right now so are bending this path around
this is affecting things ins base
but not in time so just the same way we can bend these handles in space
we can grab these key frames go into the graph editor
and affect the meantime so when we look at this graph
i'm looking at a speed rather forever edits be graph not
value graph was the value graph its we look at the speed graph
we see it is linear so there is a linear
relationship in terms of speed at a constant speed
for all these times constant speed constant speed on the plateaus
these vertical lines here I don't think should really be there I think there
should be a field in graft just because
the isn't anything happening between this vertical line
you know it it shows you the Delta between how fast it was going how fast
it is going
but other than that not much seeing seats at one speed
and there's gonna kick into a new speed and
been into another speed so it's very rigid
very linear definitely not smooth so
when we create smooth motion usually we would easy's them
but if we go animation keyframe assistant easy's
one sweet ease them have a look at the graph now
it's going up and then down to zero up
and then down to zero so it's going to one point
stopping and then accelerating to the next point
some we want it either we want to be smooth from the first point
to the last point RM so to accomplish this
we select these key frames in the middle right click on them
and say rove across time
and now it's changed them into these little dots all rights go back to the
graph editor
so these dots here are now positioned
on this curve as they are expected to be
in accordance with these handles right so I structure this handled so as to
push them in this direction
and what does that mean means can be a slow start
and then it's gonna start a wrap-up faster faster faster fastest
and then back down right and you can see here these dots along this path have
changed to represent that too
close together dots mean notta lotta movement faraway dots are more movement
each dot is where it is
on that frame so dot dot dot dot dot dot dot
and so on so the dots are helpful to them
but you know how fast things are going and looking at this graph you can also
sorta tell and Roman keyframes are primarily used to to make
position work well are ripe if we want to do something else like cuts a
delete these and we want to mess with the scale right so I wanna set
keyframe here and want to be at least 0
and then I move ahead lower
and I wanted to be at you know high number
here low number and I wanna rove
this key for him well right click on it but I can see rove across time
that's because roving keyframes are really only used
for positional problems this because
it has to take into account things like inertia and speed
and that just doesn't exist on this kinda thing
usual trick to get around that though member we had
the with some road keyframes Ryan it was doing stuff
it's going all over the place home all of these values are still
captured in here ray to can use as positional data
you know duplicate this layer tradução hitting
command dear control D but remove the position key frames from this
call that scale happen expression on here
and the say we transform the scale to be
you know one of these things and see how that goes well
now its gonna be rolled but to
you now it's going to be taking in the positional data
and then opening its that's one way you can use rove keyframes
in things that are position but you know usually just use them in the position
because thats come with therefore it's kinda for smoothing out
motion in that way now you're probably asking so whole what do I do with this
information great I
Road keyframes but other than smoothing out the stupid curly Q things
what is the point well what are the things you can use it for
are creating sorta belting effects so let's look at
how I started this thing right we've gotten this thing
balances in blink like this and it's kinda
and oscillating gyrating think now you could have used an expression as a great
inertia bounce
expression by a great machine brickman everybody have that on their bookmarks
but to what I did on this is just using
to Rove keyframes in between and it just bounces like that
uses way less resources from your computer
and is very controlled in terms love creating this bounce
really the two keyframes are just a bit higher in just a bit lower than where we
want this thing to end
and all in I think it's a pretty good solution
having this thing ballots in with a lil bit more life using Rocchi firms
so hopefully little primer on road keyframes has taught you a thing or two
about
a different set of key frames that probably you haven't used before
and hopefully helps to smooth out soldier motion over there because
nothing looks hackear then linear terribly accelerated motion
anyway this has been Evan abrams oval even joined the channel
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thanks a lot and have a nice day