All language subtitles for 08_lens_distortion_and_tracking

Hello there and welcome back

This video had under store footage and use that so he can get a more accurate

Last video

And it is time to undistort are footage there

Because orphanage has distortion to some degree

Going to figure out exactly how much we have in here

Go ahead and bring your lambs credits by 24 mm

I have that in a project here

And obvious is a chequerboard I put on my computer screen that I recorded with the camera and lens size

See exactly how it's disturbing

And it looks like it's fairly saddle you can see it down a little bit at the bottom

So how do we deal with lens distortion in nuke

What you mean now because we make a gizmo using it last week but we use the allianz distortion

You need to be in Newkirk to use the features were about to go over just a warning ahead of time

And another thing to know is nuclear exchanging this and every new version of nuke

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Typically it all have the same functionality but it'll just be laid out in a slightly different way

This is what the ones distortion node currently looks like as of new 12

NN11 it looks different in 10 it works different so just be aware of that if you're using an older version of nuke

And so

What's the snow the loudest to do as we can undistort

Power input

And if we have a grid we can automatically detect

The distortion

So we can do that by going to this analysis tab

And when we hit the

It's going to try to identify

All of the

Connecting sackers

In our image and I'll see it's done a great job it's connected all of these

I've had some grades where it's just

Messes up entirely new have to place these my hand it's actually look at that really quickly would say that one of these

Was master

I'm gonna go ahead and delete this

And how are you draw a line in the squid

Is ugo here to the sad lines button

And then you just quick alarm to intersection points

Of the Chequer

And you can see it's connecting online as we draw and you want us to be as accurate as possible in order to get the

Underscore

The ones you place by hand will be weighted a little bit heavier in the song

What's that line is in

And you're good to go

But I'm looking pretty good so I'm just going to do that and get back

To where we were

You can see actually some of these points on the edges are perfectly aligned so we can just go through and fix the

Make sure everything is a lining up

Correctly

That's just going to give us the best solve

And I think I said from those points this was looking pretty good along the edges

Oh yeah nothing else really jumping out

I think we need a pretty good Saul from this

Analysed your chequerboard grid pattern

I need to do

Is he

Salt

And then what it will do is it will attempt to flatten your Image out

As you can see here

Ireland's distortion was

Really sad

Not a turn in here

And if we go to this one's distortion Tab will see it autofilled out or distortion parameters

It's estimated the centre of a lens because

When does imperfect Creations and distortion doesn't perfectly happen from the middle and so this is calculating 4th

And so what we can do with you once distortion now as we can undistort or input

Store input new £12 inbox settings are all pretty good by default they fix

From Luke 11

And there is another option

We can use a nasty man

To read a start an under store footage for not going to do that I can show you a little what that looks like

Inject extra channels and this is essentially a distortion grid

That you can use to modify your image

But in this case we don't really need that

And what's going to use this lens distortion

What's go ahead and see what this looks like on earth footage

Where will I do actually

Is I want to keep this as my master copy so I can copy and paste from it because sometimes

Lens distortions accidentally getting messed up in your comps and we don't want that happening here

We can just go ahead and make a backdrop

To stay nice and organised you know how I like to work

And we can just call this ld4 lens distortion

Make a nice purple colours inside the transformer

Every girl's something

About

And perfect

I'm going to copy and paste

And set this

You understood

And let's take a look at what it's doing

Taken seriously distortion on the edge that it is accounting for

So now we should be good to track or imgur

Before we do that it's always good to dinos your image

For your tracking it is not a tonne of Grain in this footage attack

Pretty Queen

Overall regardless it is good just a smooth out any will noise that's a parrot

So go ahead and do that quick

I'm going to use

Reduce noise again because it is really just the best denoise in the game

What's find a frame maybe we're looking up at a darker trailer of the sky

Nlcf

Selector 84%

Looks good

You can just see it's moving

That out and that exactly what we want

It's pretty sad also I think leaving at edit default radius and threshold will be fine

And I'm going to write this out

So we can work on hard remember

That's what I said to you Alexa

800

Because that is the closest Curve

QD black magic Curve

And I'll go ahead

What do Perez 42 that should be more than fine

Andover a fingering

Alright I'll Rinder is now done let's go ahead and bring it back in

And we have dinos plait in front of us here

And let's go ahead and talk about how to track this

With our lens distortion

Now what you want to do is undistort

Image

Then we track it

And then once we have a track that we feel good about

We won't reverse this order and put a match move

Here and then underneath it will put her lens distortion node but will set it to read a story

And that will give us our proper track

What's go ahead

Ian

Are you a track your will see if we can get away with just a normal point track

Statue was approximately in this area so will let us run through right here

And it looks like it's been pretty sticky so far you can see by these beauties

Spinach isn't the best

I was being a little shaky when it was being shot

But we should be able to get an ok track on it regardless we'll go ahead and pick or second

It looks like it should work fine

Stretch that out and attract the end now

And see what exactly we end up getting

Call salad that's done

We can go ahead

Turn on auto translation rotation and scale

Both of these so I can go

And let's make a stabilised to check the quality

Of our track

Preview this really quickly

We have this preview

And it does look like we didn't get rid of this scheming entirely looks like it was

Send but as we scrub through this back and forth really quick

If you're kind of looks like a 2.5 di Skewen

That's happening here

So does look like we're going to have to try to do a 2.5 di track

What's just to get rid of this track

Yes that's connected to the stabilise of our slab contract as well We Don't Need That Anymore

I think to try to get this 2.5 di tractor work weekend just track these

Four points here

Because what that's going to do is if there's any

Flight miss track here

At the top of our frame is in the exponentially more apparent and exaggerated and that's not what we want

And so we should try the track deep in her background

Baby even from here to hear and then in a foreground

And then theoretically in the middle

It should stick just fine

What's go ahead and give that short but I need a track this four times just like we didn't meet to

This is a nice contrast spot

So go to the beginning

What that process cannot click here and go to the end

Call an hour Top let's go ahead and add a track down here

Wondering what's go with the spot mice and contrast E4

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What track backwards

Potentially should have expanded this

Regional little bit

But it looks like an ended up working just fine with the defaults

The next

You can go ahead and try

All the way over here

That's great job

This point

Retract the end

Who looks like that's like the whole time and we need one more

Animal track down here

And we'll go to the beginning

Also we have our four Points done

What's your head and say like them all

I will make sure we have

Are translation rotation and scale on

We can go ahead to go to frame 65

Wind us here with a reference frame

Let's go ahead and make a corner pin

Type this in

What's go ahead an inverted so it turns into a stabilise

And we'll see if this has improved our skewing at all

Call solicitors login

Much much nicer scrub through this be not really see any of that scheming happening

I'm very happy that a 2.5 di track was able to work here

Wasn't entirely sure that it would but it's a happy surprise

Something you may have noticed when this is previewing

Venus

In here I must like there's a heatwave

And that's because we're not concatenating properly when we're doing our transforms in this

We talked about concatenation in week 2

And we know that corner pants can't catch me

From the inputs and the outputs

But the reason is wobbling is happening is because the lens distortion can take concatenation into it

But it came out put concatenation so even though we have the ones distortion feeding into a corn

You pixels are getting filtered twice in causing that were born

The good news is when we were first this for our track it will concatenate properly

Let's go ahead and look at doing that now

I'm going to label this

And we can copy

Peace this over here

We will on invert

And then we want to copy and paste or lands distortion

And what we want to do now

Is invert this so we are disturbing

Rcg

Be very well could have understood our main footage

Merged are statue over than we sorted the whole thing

That's kind of filter the pixels a couple more times than we want to

So it's best to leave the main for the untouched one

And now because he wants distortion concatenated input but not out

That warbling should go away

We have the setup and it's time to check or statue track

Before we do that

I want to talk about how we can optimise this a bit because this track and would likely take a while to play

Because we still have to turn our motionwear on

That's a centred and turn motion blur on

And this motion Blur

You can see it's affecting all of the channels that are going into it

It's not only calculating on what we can see here

It's also calculating

On albedo

Honoured

Interact

Every single channel that we have that in here

This Green

Marker on the side means it's calculating extra channels

So how do we optimise this

Well

We can actually remove channels and

So that they don't flow through

Heavy nodes

We can do that

Using a remove node

It does exactly what it sounds

When you pay bill in

It's default is to remove all channels

What we want to do actually

Is we just want to keep

Rgba

And you can see now

I turn it off and on this green we'll box disappears and no longer calculating

All of those extra channels

In these three nodes

Because it's removed them from the camp at that point

And then the next step we can follow to optimise this

Is we can manage their bounding boxes or is very important

And your notice we have a little extra on the outside

This was rendered with overscan

Why was it runs out with overscan what's take a look at the side right here

I want to turn this crap on

You'll see

That we walked off

The side

This Renta

Overscan because we knew we would have some sort of lens distortion

Ansell

The Lancer specialist grabbing his pixels on the left side and bringing them in

We can see that squeeze here

I need to make sure I make from this

We're not laughing off

Does extra pixels

You can go ahead

And carefully

Crap this it's nice and optimise but that we don't cut anything

Very girl that is much better

What's go ahead and for us

I think this is looking pretty good

As always the best way to check your tracks

Is with a stabilise

So we can just grab a corner pin me I need to run it through this under storage has not really necessary in this case

Because this is still going to stabilise the image as a whole

And that's make sure that the sky is track in the entire time

Call for that works

Nice and steady there

Scrubs

Rick

And looks like everything is sticking

Very nice

Wonderful

I remember we did say the scale felt a little strange on this

Because

It looks like there's maybe

Eat between our actor and the statue

Bye

That would make him around yater

And that looks much more than that to me just based on the scale of this rock texture

I think we can do

Is water

Have our own little cheetah

Transformer

This is all going to come get me

And we can just see this app

A little bit

And that's gonna allow this to feel

Much larger when it's further back

We can take it a little

Further

The higher up the larger the scale is going to fill

How's that

I think something like this is working better still potentially a little small

I will say this is good I think this is working

Course I'll get rid of that stabiliser track is offset and good

I'm going to go ahead and just move this after the side of you popping paste it

The end of this video was organised

A little bit more

In our next video where they go ahead

And start giving into the nitty-gritty details of camping this statue

And I think we're gonna learn a lot while we were doing

I'm gonna finish organising this and when we come back we can actually get to compositing or statue

Thank you very much for listening