All language subtitles for 11. Integrating edge and light wrap

in this lesson

we will add edge integration via light wrap techniques

now there's two areas that I foresee we need to work on

first is the light wrap

around the edge of the actual fireball

and smoke that's happening

as well as we need to add light wrap

around the edges of the buildings

that are in front of the actual fireball

and the explosion in general

now obviously

you're seeing

you're going to be seeing some edges here

because obviously

our roto isn't perfectly aligned

that is something that I am going to not worry about

for myself because that has been discussed

but you as the compositor

have the challenge to be able to take that

and clean it up for your final shot

that you potentially could use for demo real piece

but for this example

we're gonna continue working through and not uh

focus on some of the more tedious ex

parts of this compositing exercise

which would just really bog things down

since you get the general gist

of what we have already done with that roto

but for the moment

what we're going to work on

is light wrap around the fireball

and light wrap around the edges of the buildings

that are in front of the fireball

so the first step I'm going to do is

I'm going to focus on light wrap

around the actual fireball itself

the fireball

and the smoke cloud that's developing

so there is a node in nuke

that is called light wrap

so if you hit that tab key in the no graph view

and type in light wrap

you're gonna get it right there

you have two inputs

one input is the input that needs that is

that is pulling alpha channel

and the other input is basically the background

that it's going to hold the light wrap inside

so let me let me demonstrate

and it'll make more sense

what we wanna do is

I'm going to connect the a input to the

the that premult right there

the B input to the previous background node

prior to merging the two together

and the reason I'm doing this before the Outnote

is because I don't want to do light wrap based upon

cutting out the edge dot section of the fireball

I wanna actually base it upon its original shape

so now we have light wrap

now there's a couple settings we want to adjust here

the first one is

I want it to generate wrap only

the reason for this is

I want to separate the wrap out

so otherwise

it's gonna composite the light wrap on top

and this is gonna have to feed through

the reason for this is because I

personally like to have a little more control reason

what I'm meaning by that is

then what you do is

you do a merge

and you're adjusting

and adding that light wrap on top

of your pre existing element that way

you just have a little more control

and you can visibly turn things off

and you know exactly when you're troubleshooting issues

what's happening

alright so let's pull that

let light wrap up

and what I'm going to do is

I'm gonna just crank up the diffuse a bit

and we're going to also bring up

the intensity a bit as well

uh so let's

let's try somewhere in that realm

now what you're gonna see

you see it suddenly just lit up the edges

so if I turn off this merge note

now you can see

adding light wrap

is basically helping to blend some of that those

the edge detail

into the color that's already in the background

that's just helping to seed it just a little bit more

add a little more realism

we jump to a different frame

let's look further down in the

in the shot

you can see here

it's a bit much

it's a bit heavy

in fact in fact

it's quite a bit too heavy

so what we're gonna do is run a

back off but I'm

for the example

you're able to get an idea of what's happening

I think that's the important part

so you can see

right there that's

that's your

your mouth too much

obviously so

let's just back

begin to back off

the diffuse is gonna

you can see where

it's basically gonna increase

the amount of softness inside there

and how thick

you could almost say

the light wrap

is how far in

it's gonna happen

the intensity is just how much

you're applying

if you set it to zero

and nothing's gonna happen

a value of 3 or 4

in my opinion

would be somewhere in a realm of

appropriate

uh you don't wanna go too much

sometimes it's better to be a little more

uh tasteful

than super obvious

you can see

right there

it starts to integrate

a little nicer

it seats it

let's just pick another frame here

and just see how it looks

yeah that's

that's not looking too shabby

now let's go back to that

more intense

bright area

that's going on right here

and move it up just a little bit

take a look

turn that on and off

and there you go

so you can see it's a lot more subtle in this area

you could if you wanted to

you could animate that and uh

towards the beginning

you could really wrap it and make it a lot more

a lot more brighter

as far as its edges integrating with the background

personally I don't think that's necessary

but if you wanted to go that route

you are the composite of the artist

in terms of this

you are the art director

so you get to have a bit of a say

which is pretty cool

alright so we worked on those

that integration

now we need to work on the integration of the edges

around in front of the buildings

so let's take what we're going to do

and what we're gonna do is

we want to take the fireball

and we're going to hold it inside of

the rotor that we've created

that's cutting out that edge

which is right here

this rotor right there

and if I just view

just for kicks

for the moment

let's view right here

and turn on the alpha channel

you can see the buildings right there

so that's what we're gonna work off of

so I'm going to actually move the viewer down here

and we're going to add a merge node

and I'm going to actually drop this

in front of everything

so we have that right there

I'm gonna turn

oops apologies

I'm gonna turn it off right now

and the on off shortcut by the way

to turn on and off a node

is the d key on the keyboard

when you have it selected

in the no graph view

and we're going to bring in another merge node

and I'm gonna set that node to in

and I'm going to spring in

just route this rotor around

bring it down and again

like I said earlier

you're going to want to clean up that rotor yourself

because right now

you can see where you have edges that are not matching

uh accurately

and that's okay

that's just a matter of

then going in and adjusting the rotor shape uh on

on frame uh

you could go posed pose

or frame forward

or frame backward

I would suggest posed pose in this case

based upon the fact

cameras moving about back and forth

just hit those extreme poses

and make sure all the rotor lines up

and you'll probably be in pretty good shape

okay so uh we're going to set this to

work as in this way

so let's move this up a little bit

I'm gonna say

I want that held inside this

and we just delete that

we don't really need it

and if you look at that

you can see now

the fireball is held inside those buildings

that's perfect

and what we're going to do now

is we basically want to integrate

light wrap onto the building

so we can try a few ways

you could do either an edge detect or

or you could use

in this case

a light wrap

so I think what we're gonna do

is stick with the light wrap

so now that we have that

we can just hit light wrap again

bring that in

and connect from here to there

and we'll clean this up

after we get things looking proper

and connect that

and view at the light wrap

you can view right there

and we're gonna increase the intensity

oh and don't forget to hit generate wrap only

cause we wanna do

we wanna wanna add that

on top of what we're already creating

so now we're going to bring that over

just like that

and connect that

a input there

turn that back on

and view at the end

and what you can see happening here is

it's adding

a little bit of light wrap

now the only problem we have going on here is

now it's adding light wrap on the bottom

we do not want to add light wrap on the bottom

we wanna just add light wrap on the inside

so what you're gonna have to do is

you're gonna have to hold that inside itself

so you could take a

for instance first off

before we do that

actually let's just kiss this in

because I think we're going

we're going a little too much

and we wanna

diffuse it out a little bit

add there we go

uh and then start to see what's going on now

now obviously

disregard this area down here

that's obviously all error area

and you don't wanna use that

but you can see where you're getting some light wrap

on top of the buildings

which is nice

and will definitely help to integrate further

let's just jump ahead here and see what it looks like

at that point

if it's even worth it

now you might be looking at the saying well

is it even worth it

it might even be a question of

is it even worth it

um the big area is obviously based on these areas

you need to remove

but the reality is

it might not be worth using

but I'm showing you

so that you have that in your bag of tricks

and if you want to

you can integrate

for now I'm looking at this

I really don't think it's gonna do much for me

so I think I'm just gonna leave that off

but I'm gonna leave this in the comps

so that you can further mess around with it

if you want

and see if you want to try to get some more proper

integration going on with that but again

edge integration is an extremely important thing

just to kind of recap over this

because edge integration does show

not only does it seat CG objects into real world areas

a lot better

but it also helps to just

provide for a little more realistic approach

because obviously

light does bounce off objects

and you do get certain levels of light wrap

that is happening

based upon your cameras that you utilize

that are shooting the footage

as well as just real world

actual surface related uh

interaction with what you are seeing in this

in the shot

so to do a quick recap

we've discussed some edge integration

via utilizing light wrap um

and we will now continue on to doing some of our final

modifications of our fireball

and our next lesson

and some final element integration

and continue through this lessons that way thank you