All language subtitles for 05. 3D camera tracking

in this lesson

we will continue discussing

how to create our 3D camera track

based upon our live action background plate

so we had already set our input controls

for the camera tracker

we are aware that there are other tabs

with various controls

most some of this in

like the settings and stuff

can be set up prior to setting the track

but most of the stuff is based upon

your track information

that will come once we've hit the track features button

so let's hit that button and run our track again

let me just click that

it'll begin

but let me remind you again that you need to remember

that this needs to be utilized in Nuke X

you will not be able to use your your track

a camera tracker analysis set up

based upon just using standard nuke

so okay so you can see here

in the actual viewport

these little X's

diagonal x's

that are basically the track features points

it's taking that information and tracking along

to create an actual 3D camera path

now you'll see it's moving forward in time

that is knit normal

but once it hits the frame 1 80

it's actually going to bounce back and do the reverse

so it's basically tracking forward

and then tracking backward

to ensure that all the tracking information that it has

that is incorporating and analyzing for

are actually properly analyzed

so now you can see it's bouncing back

and it's going backwards in time

so we're just gonna let that continue

and then in just a few seconds

we will resume

there's not a lot to discuss at this point

because obviously

we're just sitting

waiting for the track to finish

and then ultimately

we can solve for it

okay so here we're back

you can see that it is just about to finish

it is now finished

and you can see the actual track information

that it has created

all these little lines

so if you actually kind of scrub through

you can see where it has analyzed information

and it has track information

so that's pretty cool

pretty exciting

so now at this point

what we have

are able to do

is now we can solve the camera

so you can basically see

obviously like I said before you can

you can run your mouse over each

each of these buttons

you can see a definition

but the point of the the

the of tracking

is you're gaining the tracking information

and then you hit the solve button

to solve for the tracked frames

it's gonna basically tell you if

the tracking information is accurate enough

based upon the settings that we have input

now the settings that we have input

would be right over here in the settings tab as well

so you can basically say okay

I want various things like

for instance

keyframe spacing

that controls the number of keyframes

that are gonna be automatically applied

in in your actual tracking information again

like I said I could

I could read these off to you

but obviously

there's just no point in that

it's all very obvious once you begin

following this lesson

so let's hit that solve button

and we're gonna be able to find out just how accurate

our track was

so hit solve

it just failed to initialize

so the question is

why did it fail to initialize

so if you read your

your error message

failed initialize the camera motion

try manually defining the reference frame for the solve

in the settings tab

alternately

change the keyframe spacing

or the track

or track the shot again

changing a number of features

a distribution of features that are tracked

okay so basically

what this is meaning is the

in fact let me just go over here

if you go over to keyframe spacing

like I would actually mentioned just a moment ago

I was kind of anticipating this might happen

what we need to do is

we actually need to minimize

uh this number

so that this point three value is a bit high

probably four

the for the track that is occurring in this shot

the reason being

and actually

you can if you

if you mouse over

you can actually see that second half of the

of the description

reduce the separation in fast motion sequences

for more accurate solve

so in this shot

because the shot

you can see is doing

basically just a quick camera

kinda rotation

slight pan is

is basically the

the reason that it is failing

is because there's there's

there's too high of a number

for the keyframe separation for it to solve

so let's just drop that down to 1.2

let's go back to the Camera Tracker tab

and let's try solving again

so we hit solve again

you have options actually

you can either update the solve

so it'll basically

take the pre existing solve information

and update based upon your new settings

or you can just hit the solve button

what that's going to do is

we'll just literally reset the current solve

so obviously

nuke is smart enough

and kind enough

to ensure that if you

if you didn't mean to do that you

it's gonna ask you

but in this case yes

we do want to reset the current solve so hit yes

it's gonna run now it's

it's solving and hey

let's check that out

we got some green

we got plenty of green uh

tracking points now

so we actually have a

a good solve

didn't error out

didn't fail

so you can see

based upon this

you can see all the green points

the green points

are the ones that are the most accurate

best solved information

so the majority of our information

for this shot

is coming from our

mid foreground

so you can say foreground

but you know

technically

this is more of a midground a level of

of mountains

but the closest mountains

on the screen left there

tracked really well

but you can see that

that background

information

where it's kind of faded out

with all the fog and everything it's gonna

it's gonna be a lot more difficult

to solve for

so that's why it's

it's giving you a little more alerts

on the color based

information

on the trackers so

so we're good to go

now actually

what we have

is a solid enough track

to be able to utilize

to create our camera information

so at this point

now we have our camera tracker

all set up and ready to go

it's already tracked

it's already solved

now what we wanna do is

we wanna export our camera

so you can see right here

at the bottom

of the camera tracker tab

where it says

export by default

it says camera

and you can hit that

create button

if you wanted

but if you hit that drop down menu

you can actually

see a few more

nice little setting

so you can either

create a camera rig

the camera rig

is a little bit different than

camera camera set

for instance

camera set is

it's I believe

it's going to create the

in fact here

we can just confirm

that you can create

the camera set

it's one camera

per salt frame

so that's literally your

if you have

if let's say

you have 180 solved frames

you're gonna be

creating 180 cameras

obviously that's

not what we're wanting to do

for this one

you can see seen

you can seen

seen plus in

the scene plus

again that one

actually if I just bring this up

the scene plus

is gonna give

you your scene

it's also gonna create

the point cloud

that's based upon all these

tracking points that

the tracking information

that you have

it's also gonna create your scan

line render

and the lens distortion

und distort node

so in this case

I think what we're gonna do is

we're actually gonna create

the scene plus no

now we really

don't need to

all we really need to pull

out of this

is our camera

information

but I like the scene plus no

because it does create

some other nodes

that we are going to use

in our next lesson

so at this point

let us just

set that to scene plus

let's hit a

hit the create button

and let's see what happens

okay so if I

full screen

our node graph here

you can see

we have a few nodes

that have been created

we have our

camera tracker

node obviously

is the camera tracker

that we were working with

we have our camera

now this is

our 3D camera

that was created

based upon that

actual camera

tracking information

you have the camera tracker

point cloud

so that is the point cloud

that was created

based upon all those

little points

in fact let's just

take a quick look

you can actually

see it here

the point cloud

is right there

so if I zoom in and also

just a quick note

so if if you're

working in 3D

for the first time

or if you're a

season 3D uh

nuke guy or girl

um you will be using

the alt key

on the keyboard to

to move around

within the 3 space

so you can use the

middle mouse button

you can see

does this movement

the right mouse button

if you hold down

Alt and right

mouse button

it will rotate

and basically

and then then

Alt left also

just move back

and forth so

you can see

that you have

your various

it's very similar

if you're coming from a

Maya background

or any kind of a

3D background

you can see

you have your

three basic

3D space movements

controls that you can

utilize within

nukes 3D Space

and then of course

you can use

the middle mouse button

track wheel

to be able to

zoom in or zoom

out anyway so

let's get to

the point here

we have our camera

so if I select our camera

double click

that you can

see obviously

it's kind of

huge in scale

that's fine

we're gonna

worry about

that right now

but you can see

where the camera is

so if I move

back and forth

you can see

the camera move

but you can also see

your point cloud

information right here

and then we can

move on down

we have our scene

which is gonna assemble

those elements

and then the

scanline render

is basically

taking your 3D

scene elements

and it's gonna combine it

if you have a BG input

which we do for this

in this case

it's gonna combine

it with your

2D elements

and come together

to render it out

now what we're gonna

probably do

in the next lesson

is we're actually

gonna discuss

a little bit of

a different

strategy for

what we're going to be

setting up for

just because

of the way we're

going about

setting up for

our final shot

but just to do

a quick recap

and then we'll continue

in the next lesson

in this lesson

we finished

discussing how

to create our

3D camera track

based upon the

live action

background plate

we've also done

just a little bit

of a discussion

on some of our 3D

nodes that were

created based

upon our camera

tracker node

when we exported the scene

plus option

and we will

continue to

discuss those

elements and nodes

in our next lesson