All language subtitles for 1月31日

welcome to this new Pixel fudger video

today we have an epic showdown between the

said the focus node

the new bouquet node and will also throw in

pxfid focus into the mix

we are gonna do a more creative type of defocus

something that simulates the effect of a tilt shift

lens if you are interested in a more

traditional depth of field

defocus based on a depth channel

this will come in a separate video very soon

so make sure you're subscribed to the channel

so you don't miss it

alright so I have a beautiful photo of a city here

I've made sure to convert it to linear properties

so all my highlights are

now nice and punchy around 10 12

13 something like that

so that's gonna really bloom nicely when we defocus it

and I also have

an animated gradient that I've built with a

couple roto shapes here just to give us

a control channel to drive the amount of the focus

I've combined the two images together

with a copy node by copying the alpha

of my roto to the depth layer

the default depth dot Z layer that's built into nuke

and that's gonna

make both images travel through the same pipe here

and we're gonna create a Z defocus node

and a Boca node

and we're gonna use the main input for Zeti

Focus is called image as it should

and bouquet node is using the input input

so that's a little bit weird

for a name but that's fine that's the main input here

all right so we're gonna connect both nodes

like so

and now we have a few items to adjust on both sides

so first we got to pick

which channels we want to defocus

by default zdfocus picks all

I don't want to do all channels I just want to do RGBA

and

here on the bouquet side it's already set to our GBA

that's fine then we're gonna pick

which channel we want to use for the control channel

so both are set by default to

depth Z so that's fine here and that's fine here also

next on the ZD Focus side we have to pick

which type of mask we want to use

so for this demo we want to use a direct

mask so that's going to

directly drive our defocus by using the

control channel

we don't need to adjust that here on the bouquet side

next we need to adjust the focus plane

so that's the

area of the control channel that's gonna be sharp

so we want the black to be sharp

so we want the focus plane set to zero

on the bouquet side the focal plane is set to 100

by default we're gonna change that to

0

and next we need to adjust the size

we want a big old defocus

we want lots of defocus in the corners

so I'm gonna increase that to a big number like 80

pixels and notice that my defocus is not that big here

that's because I'm hitting the

maximum limit here

so I need to increase the maximum to at least 80

I'm gonna give myself a bit of headroom

and increase it all the way up to 100

on the bouquet side

the size is called multiplier and I'm gonna

change that to 80

so now I have a very similar result on both

sides all right cool now we can start comparing so

right off the bat

I can tell that bouquet is much

slower I've made sure to enable

render all lines

on both

viewers so zooming in and out won't affect performance

so if I render both their their

nuke renders

both viewers one after the other so we can compare

the the speed and ZD Focus renders much much faster

and bouquet because mainly

ZD focus is GPU accelerated

and bouquet isn't bouquet is 100% CPU bound so

this result can be

very different from one machine to the other

it really depends on how fast your CPU is

compared to your GPU alright so both

renders are done so I can look at the

difference in quality

they look

pretty similar on the surface but when you start

paying attention and zooming into details

can see they're not totally identical so on the

bouquet side the result is pretty smooth

and if you look on the ZD Focus side

it's pretty steppy it's pretty jittery or frame skippy

for example if you look at this area here

if I toggle between frame 22 and 23 you can see the

circle is not moving

where is it on the bouquet side

it is moving on this side it is changing as it should

so when your

renders are really steppy with a ZD focus note

it means your

depth layers aren't set up properly

you can see that more clearly if we turn

off automatic layers spacing

and set the layers to a really low number

like say 10 layers

so now this is going to render really fast

so that's really great for performance

but the quality suffers quite a bit

you can see when we

playback in motion

we can actually see the boundary between each layer

so if we look at this we can see

different defocuses and the transition from one band to

another so this is great for performance

but this is terrible for quality

so

adjust this

the best way to do that would be to change our output

to layer setup

and now we can see the actual bands

individual bands here

and this is

not optimal at all

so one way to optimize this

would be to bring our maximum down to the same

value as our size

so that's going to optimize this a little bit

so this will create

more bands for the same coverage

and then we can increase the number of bands of course

so for this we need to increase the bands quite a lot

about 150 so we don't see the transition from one band

to the other and now

if we buffer just a few frames we should see our

little bouquet circle will progressively change size at

every frame instead of skipping frames

so we won't see

the banding artifacts

so that's great we fixed our

our problem but now our render is much

slower it's a

three times slower than it used to be at 50 bands

you can see that the focus now is

slower than it used to be

so now in terms of speed we're pretty much similar

another thing we can compare

is if the results actually match between each other

so if we compare a Z Focus

and Boca

here you can see that there is a difference

so for some reason

Boca as an arbitrary

maximum limit that I can't seem to get away from

so no matter what I change I cannot reach

the actual size that I'm supposed to get

in the corners here

so it's not a true linear match to my roto values here

this is a bit annoying this bouquet is

too small compared to what it

should be according to the

control channel

so this is quite annoying

I think this is because I'm hitting the limit of

the maximum kernel size here

but I can't make this bigger if I

try to put a bigger number

it caps out at 256

so I'm not sure what the solution is

if you know the answer put it in the comments below

I would love to know

alright so that's

another difference between both bouquet and ZD focus

now that we have pretty similar results let's compare

bouquet shapes so right now both are set to circles

we can change that

so for right now we're set to disc here

on the zdfocus side

if we change that to bladed then we'll have a little

pentagon

if we do that on the bouquet side that's in the

kernel tab and kernel type

circular means circles of course

and aperture blades will give

us little shapes

and if we change that to

five blades we'll get little pentagons as well

if you want to inspect

the bouquet shape more closely you can go in the

output type and pick filter shape

and on the Z focus side

you can pick

output

filter shape setup

so now we're comparing the

bouquet shape generator on both sides

so on the

Z focus side you can adjust the roundness to make the

edges straight or round

you can adjust the

inner brightness to give your bouquet

a little bit more of

a ring type of effect

so if we go to our result now we can see

we've got a little ringy bouquet

and you have a few other

adjustments so you can adjust the

thickness of the ring and so on

the bouquet side we have similar controls

so if I adjust the curvature I can make the bouquet

round or flat

but I can't seem to get really flat edges here

so I need to go to negative curvature

but

it's always kind of a bit wonky

and it seems to be worse if I have less blades

so if I want a true triangle

there's no way to do an actual triangle here

which

you know arguably is not that common but it does exist

and I can't seem to get straight lines here

so this is a bit

annoying but if we're stick with a little pentagon

it's not too bad I guess

but you hit the limits pretty

early and if you want to have a ring effect

that would be under

optical artifacts and spherical aberration

and it does kind of a center

that's darker but it's a different type of shape

so we can't really match them perfectly

another thing that's

available here in bouquet that's not is

chroma aberration

so if we go back to our result

and enable

chroma aberration

or chromic aberration as they call it

and you can see

does a little chroma aberration type of effect on the

edge here

you can do that natively with a

bouquet generator and ZD focus

but you could fake that afterwards with a

chroma aberration

after the zdfocus or feed a

bouquet shape that already has chroma aberration

built in we'll get to that in a second

all right so let's turn off Chrome laboration for now

so if we look at our results

now of course

they won't be exactly the same

because I'm not using the same

bouquet shape but they are

fairly similar

if you're not satisfied with the bouquet generator in

either

zdfocus or bouquet

you can feed it your own bouquet image

so here I have a little image 255 by 255

I'm gonna

connect that to the filter input of the ZD focus node

and the kernel input of the bouquet node

and in zdfocus I'm gonna switch that to

filter type image

and for bouquet I'm gonna do kernel type input

you can see they look similar

but one is upside down compared to the other

so if we want a true match between both

nodes we need to put a mirror node

set it to vertical flip and put that

in between our image and our

kernel input here

so now we have a

true match between them

if we didn't have the actual

upper limit that I'm hitting in the corners here

they would be very very similar if not

identical images here

so this is

pretty close so you can use obviously

custom shapes here little hearts or whatever to

have a creative output

but you could also capture the true bouquet

of a true lens

so this is a photograph of a

tiny light source that was

shot out of focus

and this is the actual real shape of the

real Iris of a real lens

and we can use that instead here

and now we have

the

actual

bokeh of a real lens

that's synthetically applied to an image

so if you need to match a true lens

you could shoot a bouquet sample and use that in your

filter or kernel inputs here

note that my bouquet sample here has

chroma aberration built in

so we want to have that in our

result as well

so bouquet does that natively

we don't have to adjust anything

we do have the little red Halo around our bouquet shape

if we look at the ZD focus node

we don't have the chroma aberration

that's because it's using the alpha channel as the

filter we could click E

use input channels to

use the individual RGB channels to defocus our image

and it looks a little bit wonky

that's because it's using an impulse filter

to resize our defocus

so we can uncheck

legacy resize mode and use a qbic filter

and that's gonna be much smoother on the edge

so I'm not sure why legacy is turned on by default

this should be off by default

maybe a little update to our

preferences should be in order here

so let's compare

both sides now we have very very close results

bouquet still is capped

to some random maximum here so that's very annoying

but otherwise they are

almost interchangeable

in terms of result and render speeds

mostly because Foundry doesn't give us any

blending controls of the depth layers

if we did have blending controls

then we could reduce the amount of layers quite a bit

still get a very acceptable result

and speed up our renders massively

unfortunately we don't have that here in the ZD Focus

if there was only a way

to do that that would be awesome but wait there is

we can use PXF ID Focus so let's do that instead

I'm gonna put bouquet aside

and we're gonna compare ZD Focus to

ID Focus really quick just to see

what's the difference between them

alright so now we've replaced our

bouquet node with an pxfiid focus

that's a pixel fudger gizmo

of course it doesn't come with nuke

you have to install it separately

we connected our image input to our

photo of the city and we've connected the map input

to our control channel

and by default here we've got a

size of 20 let's make that bigger to 80 to match

and already we have a pretty

similar result

the main benefit here is that we can get away with

much fewer bands of the focus

so by default we have 10 bands here called slices

if we turn off the overlap completely

we'll be able to see our bands very clearly

so here we can see the transition from one

band of defocus to the next

to the next here

there is zero feathering between our bands

so we need to adjust the overlap

if we adjust the overlap a little bit

to like let's say point two

then we'll have a result that's very similar to

the zdfocus feathering between the bands

so we can see the transition still

it's a bit smoother but it's not invisible

however unlike zdfocus

we have full control on our feathering here

so we can increase the feathering a lot

so if we crank that up to the maximum of 1

then we have a full feather

between each band and it becomes much harder

to spot the line between each band

so even though I only have 10 bands here

which is very low

it's almost usable as is

however you can kind of see both

values blended together here

so maybe 10 bands is a bit extreme

let's make that 25 bands

just to have a bit more precision

and now we get a result that's pretty smooth and

almost interchangeable with our 150 bands here

so this is gonna render much much faster

so if I turn off set the focus for a second

and just update the ID Focus

you can see it's rendering at 11 frames per second

so it's really really fast here

so this is so much faster than ZD Focus that I would

just for that I would pick pxf ID Focus

there's also other benefits here besides the speed

we have a more complete bouquet generator

so the built in bouquet generator has more options

compared to zdfocus

and just like zdfocus and Boca we can feed it our own

shape if we're not satisfied with this

we have the Boca input

there you go so we can feed it our own Boka

so there you go

that was our epic battle between

the bokeh node the ZD focus node and PXF ID focus

if you want to achieve this type of creative defocus

that's similar to a tilt shift lens where you

control the defocus with a random

control channel

I would definitely use PXF ID focus

if only just for the speed

improvement for the performance

if you don't have Pxfid Focus I would use zdfocus

I would not use the bouquet node because of the

upper limit on the control channel

so let's compare the features of our different tools

here in a nutshell

Zdfocus Bouquet and ID Focus all have variable

size d focus that's great

zdfocus has a variable

number of bands which is great to optimize performance

so does ID Focus

but ID Focus enables you to adjust the overlap

between the bands

which enables you to lower the number of bands

quite a bit makes the render

much much faster

so that's the main benefit I think of ID Focus here

you can generate your own bouquet shape

and all three of them

ID Focus has the most complete bouquet generator

you can do straight corners

rounded corners noisy bouquet

chrome aberration

so it does it does almost everything

bouquet and Z Focus can generate bouquet shapes

but they're much more limited

all of them have a

custom bouquet input

so if you're not satisfied with the bouquet shapes

you can feed your own

and ZD Focus and ID Focus are GPU accelerated and

bouquet isn't so that's a difference there

between bouquet and the other two

so there you go

that was an

overview of the different tools you can use for a

manual tilt shift type of effect

if you want to do a

depth based defocus

on a full CG image for example

stay tuned there will be another video

about that soon

so make sure to subscribe to the channel

know when that's gonna happen

in the meantime

have a good one and I'll see you in the next video

goodbye