All language subtitles for 07. 3D node definitions in NUKE

in this lesson

we will continue discussing how to build our basic

note based 3D scene within nuke

we left off in our last lesson

having created all the required nodes

within the 3D scene section of our comp

but we didn't really

fully discuss exactly what was going on

so the the basic gist of this

now that we've assembled them

I think it will make a lot more sense

for you to be able to look at this to

to understand what is happening

we just move this over here

and then we're

it'll make a little more sense

just so things are a little more tidy

okay so what's going on here

now as I mentioned in the previous lesson

the projection camera is basically

like you like

you could use

like the idea of an old slide projector

where it's projecting that image of the input

from the Project 3D node

which in this case

is the building in the antenna read nodes

and those are being projected onto a card in 3D space

now at that point

it makes sense correct

so you know

it's basically a slide projector

projecting information onto

the screen that's hanging on the wall

now the reason

like we mentioned

that the projection camera had to be non animated

was because we don't want it to be projecting as the

the camera moves through the scene

so it was just the same idea

where picking up the

the slide projector

it's actually projecting on the walls

as you move it through the room

so the same idea holds true for this scenario

so our card is sort of like the screen

that the image is being projected on

the scene node is basically a

you can almost think of it like a

in a way loosely based

you could almost think of it like a

a 3D version of the merge node

where you can merge multiple 3D inputs into the scene

so for example

in this case

we have our building

that was going to be two sides

so just to refresh

let's go back up to this building

and let's just view the building

okay so you can see that we have

one side of the building here

on screen left

and the other side on screen right

so that's what you could equate to being

two different cards

so what we're going to do is

we're gonna create two cards

so I'm gonna copy that card one

and I'm gonna paste that card one

I'm still gonna input it

based upon back

its input is gonna be

still be connected to the same project 3D

and then what we're going to do is

we're gonna connect

a second input

into the scene

from that second card

so now you can see how

basically the idea being

that you have

you can have multiple geometric shapes

in putting into your C node

so you can kind of think

of it just like a merge node

where it has multiple inputs

to assemble multiple

different images

into a singular image

same idea here

where you have multiple

different geometric

based 3D images

that are gonna be input

and assembled into that scene node

now once you have that scene node

you then have the scan line render

now the scan line render is the the

the final output

of that image

prior to it coming out of 3D space

and back into the 2D environment

the point of that is

obviously because

you don't want it to stay in 3D space

you want to have a final

3D based rendered image

that then you can preview

and composite

together with the rest of your scene

so in this case

the point of that would be

assembling our

our 3D uh created

buildings images

and assembling that

back on top of

the mountain footage

that we originally created

our match move

camera data from

now to do that though

you need to have another camera input

so that that way

it's basically

telling the object

you know what

based upon this camera move

I want this

specific object

to be created in that scene

so then that way

even though the

the building is being projected

and not moving

you know you can think of it like

your slide projector

you could have almost

a secondary

camera that

maybe is like

your iPhone

let's just go back to that example of the

of the slide projector

you have the slide projector

projecting on the wall

but then you pulled out your iPhone

and you turned on your camera

and started videotaping it

so you would then be

and you walked you know

you walked from one end of the room to the other

now you just created a camera move

based upon where your iPhone is

but it includes

that slide projector

information

that is being projected

onto the screen

that was in the

on a wall in the corner of that room

same scenario here

where then your secondary camera is

the camera that is create is

is having the movement

of the 3D scene

input into it

so that then

it is able to

properly output

the proper movement

of that three

those 3D objects

that you are trying to create

so in this case again

it's the building

with the antenna on top

so again that

that probably helps to clarify

a little bit

but it will make even more sense

once we move into

the next step

of creating

and assembling

our cards in 3D space

the then our final output

will actually make sense

in terms of

the final comp

so at this stage

let's take a quick break

and we will continue

in our next lesson

discussing the 3D geometry choices

and also setting up

our 3D geometry

so that we are ready to go

with our building

in proper 3D space

to do a quick recap

in this lesson

we continued

learning and discussing

how to build our basic

node based 3D scene

Innuk and what

each of the 3D

based nodes

that we are

utilizing mean

to a certain extent

as we will continue

and it will make even more sense

as we build our scene