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hi I'm not let me hard and this is
another behind the scenes film for the

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short film clips clips as an entry into
the my Road real 2015 competition and as

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part of that we were asked to make a
short behind the scenes making a film

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but that was only land to be three
minutes long and i wanted to show a bit

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more of the process behind how we did
some of the shots particularly the sky

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replacements and some of the VFX shots
and I couldn't fit into the three-minute

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making up so I thought I take the time
to show you that now

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so in this shot this is one of our key
shots for the film our character sara is

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about to encounter the solar eclipse and
when we shot it

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it was a little late in the day the sky
had gone a bit flat

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the lights have gone quite flat and
actually the light look fine

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the light on her looks great and it sort
of suited what we wanted but we wanted

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to make the sky a bit more dramatic

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it's been interesting watching the
behind-the-scenes documentaries for the

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reason mad max fury road almost every
shot in that has had the sky replaced so

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this is a really useful technique and
replacing skies can give you so much

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more drama in your shot

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and if you live in England like I do
especially the northeast of England it

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cold and it can be cloudy and miserable

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ninety percent of the time so I do a lot
of sky replacement

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so in this shot obviously the camera was
on a dolly on a rubber wheel dolly and

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obviously was a couple of problems here
one of which is the sky is a bit flat

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and the other of which is that there is
an enormous great light in shot with the

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width of the lens and with the shot we
could really put that light anywhere

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else we knew it was going to be there so
we knew that was something we were going

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to have to fix in post and so here's the
shot in after effects you can see that

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we went for an anamorphic aspect ratio
of around 23 9 21 and that gave us a

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composition size of 2048 by a hundred
and fifty eight pixels so the original

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shot although shot 69

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we made our composition that size and
after effect and rendered all our shots

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at that side

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the first thing to do is track the shot
and I did that just using the 2d tracker

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and after effects you can see that you
just have to pick two points on the

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horizon

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make sure that you have the switches
select for position scale and rotation

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and then let after effects to is Magic
tracking shot and you did that very well

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you then apply that tracking to an
object an object is an object in the

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scene that you can't see it doesn't do
anything else other

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really just be a place where information
like tracking data can be stored and

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other items other things in the shop can
be parented are made to match the

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movement of that an object and it's a
useful way of just basically keeping

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everything together

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so once we have that knowledge extract
into the scene we found our sky and this

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is a sky that i found through a google
image search online and it's always when

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you search for stuff on google you can
always see search for items that are

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labeled for reuse that aren't copyright
control the road Creative Commons

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copyright free and i found this
wonderful shot a lot of detail my scale

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- it's about three and a half thousand
pixels wide

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perfect for what we needed so once we
drop them into after effects with a

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little bit of a master's to feather the
bottom of it off and position to enter

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the shot

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I parented to the null object and you
can see that it locks perfectly into the

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shot

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so the next thing to do is to put our
actress Rachel teat you play Sarah back

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in over the top and also the horizon as
well and we do that just by putting

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another layer of the original video back
over the top and using a luma key just

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using the extract effect in after
effects with a very very soft luminance

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key

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lots of feathering on it so you keeping
some of the original sky in there and

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and it's blending over the top of the
new sky that you put in that and once

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that's in we have another layer of the
original footage again just with a mask

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on and I just helped us keep in all the
foreground details and fill in any holes

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for anything that had got dropped out
for instance there's a small bright spot

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on the bottom of the skateboard ramp and
that was getting cut out by the luma key

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so putting that mask in without layer
just actually help fill that back in and

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also kept the highlight line by the
trees meet the sky look much better I

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think

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and again everything's feathered lots
and lots of feathering

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and obviously we need to get rid of the
light as well the light stand is still

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in the light itself as being covered now
by the sky but the light stand still

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there so we track to another track .
just a standard again to the track in

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after effects and once we had that we
went and found another plate of the same

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scene but didn't have the life standard
I think this is from actually just a

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previous take it from a different angle
and the light stand wasn't in the shot

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glass we managed to grab a piece of the
horizon with the trees and the sky

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just take it from that shot cut out the
bit that we wanted and an overlay it

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onto the top of our new composition here

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now we just need our Eclipse rather than
wait 16 years for him to come around and

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be there at exactly the right time that
we make our own

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so this is a very very simple
composition it's just a solid with a

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circular mask and then another circular
mask subtracting away from that and then

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we put that into the image then of
course we had a lens flare using optical

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flares from video copilot and the great
thing about optical flow is is that it

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lets you create custom flares in
particular

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custom textures and so what I did was I
created some custom flyer objects from

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images that actually came from a real
solar eclipse and there was a solar

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eclipse that happened and was visible in
the UK in march this year was one of the

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inspirations behind making this film and
so I went out with my ps4 camera and

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very long lens and some gaffer tape and
some ND filters because I didn't have

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the right adapter to put the ND filters
on front of the camera so thank you

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gotta tape and I shot some footage and
as you can see that footage goes very

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distinct lens flares and you can see
those little green half moons and orange

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half moons that actually came from the
lens and i was using and from the actual

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solar eclipse and so I took those as
images

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I put them into optical flares and I
made my own custom eclipse lens flare

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that's track to a light and the light is
track to the null object again

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and so it moves perfectly with the scene

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finally we did some color correction so
added in an orange solid with a mask

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heavily feathered not just give a little
bit of wants to the sky a little bit

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more of a sunset field and then another
mask on a black solid which is set to

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overlay and that's just creating a bit
of shadow from the Eclipse and then

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another solid just filling in that
little bit of hole in the background

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where we replaced the skyline the trees
the the difference in like that just

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didn't seem to quite much for me

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and because we shot on the area mirror
shot in log see which is the very very

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flat mode that the area cameras have and
it gives a very flat image but I wanted

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to see what this image look like in rec
709 color space which was where we were

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going to end up so I and applied an
adjustment layer

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I went utility apply color lot and I
selected the rec 709 a mirror a lot that

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i have and i just put on as an
adjustment layer over the top so that i

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could see and actually the final
rendering what i did was i ten that

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adjustment layer into a guide layer so
they wouldn't render with the footage

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but it's just useful as a guide here in
after effects so that i could see how

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the final shot was going to look added
in some great not too much just said to

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a ten percent and overlaid over the top
of the image and I just have to blend in

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the elements that we got it like the
lens flare like the clouds just give

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everything a subtle grain and it just
helps it all sit together

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and finally i added in some stock
footage of some custom lens flies

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and these came from a company called
lens distortions from the legacy pack

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it's great stuff i really recommend it
if you can get hold of it and not just

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gave us a lovely glow as the Eclipse
sort of first enters the top of the

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screen there and matching with your lens
flares I think gives the shot

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I really organic look obviously this
wasn't the final shot after this we took

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it into the davinci resolve we did a
color grade so the final shot here has

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got a slight color grade on it and
there's the final shot

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thank you very much for watching I hope
that was useful and sky replacement

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something I've had to do a lot over the
years so I know they were really useful

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skill to have a really useful thing to
learn in after effect

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now if you haven't please take the time
to watch eclipse and vote for a city

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like it on the road real

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thank you very much