All language subtitles for 2月21日 (9)

welcome to this overview of pxfz Defocus

note that a Pixel Fudger version 3 now includes three

different

defocus nodes

we have pxfz defocus for depth based defocus

we also have two other nodes

we have pxfi defocus to use any random

ramp or gradient as a source of defocus

and we have deep defocus to defocus deep images

this video is about zdfocus

there will be a separate video about idfocus and d

defocus

so let's have a look at the real life example here

I've got a

3 render here that was delivered to me with aovs

so if I look here I have a depth pass

the values are normal values in meters

so this scene is in meters

so if I look here at the value the chair

is about half a meter in front of the camera

the wall is about 8 meters away

this chair is about 2.4 meters away and so on and so on

so now that I have a good depth pass I can try to

defocus this image

of course you could do that with the built in

zdfocus node so nuke includes a zdfocus

and you could totally achieve a good defocus with it

however the interface is not the most user friendly

and there's one big thing that's missing here is there

there is no way to include camera information

like F stop focal length or

sensor size and so on

so that's a little omission here

there's we have to estimate the size of the defocus

and there's no way to

enter values for our lens here so

to try to work around that we now have a

PXF ZD Focus which essentially is a front end for

ZD Focus so under the hood there is a single

ZD Focus node along with some utilities

but the bulk of the work is being done by

is that the focus node

so here I'm gonna connect my rgba

Z input so it's expecting the depth to be on a

separate layer here

here we go put my viewer on it everything goes blurry

I've got an autofocus Jack

if you don't see it make sure your overly is turned on

with Q and then

if I move the autofocus Jack

I can specify which area is supposed to be in focus

so now I'm focusing on the wall

if I bring it here I'm gonna focus on the chair

there we go and if I put it forward here

I'm gonna focus on the chair in the very foreground

like so

so let's

go back to that middle chair here

all right so let's have a look at the various

knobs and controls here

so first I got to specify which kind of

the focus I want I've got a choice of

gosh and blur which is not

real life accurate

this doesn't look like a real lens

but you might want to have

some variable blur

for some reason

you can do the focus which will give you

little circles

actually

let's change the defocus point to be able to see the

filter a bit better

so I'm going to focus on the chair in the foreground

here we can see the filter so if I go to gaushan

you can see that it's a gaushan blur like a blur node

this doesn't look like a real life lens

if we choose the focus

then this would look like a lens wide open with a

circular aperture

and then we can choose bouquet which will

use the custom bouquet

and we can customize that using the bouquet tab here

so if I want let's say a 5 blated lens

I can change the number of blades

and now I'm seeing little pentagons

instead of little circles

if you want to see the

bouquet shape you can click View Bouquet

and customize

the bouquet

character

so you can have a donut you can have more noise

you can have more chrome aberration and so on

so you can customize that

as much as you want I'm not going to go through every

knob here each knob should have a tool tip

so if you're not sure what a specific knob does

you can look at the tool tips

and if we turn off View Bouquet

now we're back to our rendered image

and we could see our beautiful

custom bouquet here

if you need a very

custom bouquet and you cannot achieve it with the

bouquet tab here you can feed your own custom image

in the bouquet input

now we should have a little b's

as our d focus shape here

so this is the bouquet tab

let's go back to regular round d focus

here we go so another big feature here is

lens simulation

so if I know the f stop and

aperture of my lens I can plug that in here

and get real life accurate defocus

so let's move the focus point

to the middle somewhere here

here we go and go to the Lens Simulation tab

and click enable Lens Simulation

our specific scene is built in meters so we're gonna

switch that to meters

this lens is a 35mm lens

the f stop we get to choose the f stop

and the sensor size for this specific render was

32mm wide we only need

the sensor width

here we go so this is a physically accurate

depiction of what the defocus should look like

if we took a picture of this scene

with a 35 millimeter lens at f 1.4

on a film back or a sensor that was 32 millimeters wide

so this is a big update compared to the built in

Z the focus node

that comes with nuke

now we can enter real life numbers here

so let's go through the other

parameters we've already covered

the type of filter here

you can turn on and off GPU if you

have a powerful GPU

if it gets too slow

you can decrease the resolution for more interactivity

so you can choose half Rez quarter Rez 18th rez to get

faster if your depth is not stored in depth point Z

you can choose which channel your contains your depth

so usually it's gonna be depth Point Z

if it comes from a deep from image

you might want to use deep front

but most of the time it's gonna be depth Point Z

if it's not in one of these channels

you'll have to shuffle it first

depth style refers to which type of depth encoding

is it real values like our shot here

was the values really refer to the depth

or is it more of a scanline render type of

format where each value

has been inverted so 1 divided by the value

so this will be for

scanline render and this will be for most 3D packages

autofocus this is the picker

this is what we move here

so you shouldn't have to enter values here

this is just to move the picker by hand

focus plane is how far away in front of the lens is the

area that's in focus

so that chair that we want in focus is at 2.37

meters in front of the lens

we can use the auto focus picker

or if you have a very busy scene

you can enter value by and

if you know how far away the item is

so I know this wall is about

8 meters away

so if I set the focus plane to 8 meters

then the wall should be in focus and everything

else will be out of focus

here we go let's go back to the chair

if you do not want to use

lens simulation you can specify the blur

or the amount of the focus by hand

but this is great out

because lens simulation is turned on

let's turn that off

and now we can specify the amount of

defocus at infinity

so at infinity will have 15 pixels of defocus

note that this is not the maximum

amount of the focus possible

if you have something really close to the camera

it's gonna be much bigger than 15 pixels

so that's why we also have max size

so this is an upper limit on how

blurry things can get

so if you have stuff really close to camera or really

big

size or a really big aperture

then you might want to increase the max size

so this is the limit of how big

single pixel can be defocused

aspect ratio is for animorphic type defocus

so if you set it 2.5

then you will have ovals instead of

circles

here we go and mix is a mix knob just like

most nuke notes

you can

have mix your result with the original if you want to

there we go so

if you need to limit the effect

only to some area of the frame

then you can mask your effect for example with Erodo

like so

and now you can limit the effect only on some area

so the mask is not meant to feed depth information

depth information should come in the rgbaz input

so there you go

that was an overview of PXF Zdfocus

a more user friendly front end

to the built in Zdfocus node

I hope you've enjoyed it and I'll see you in the

next video goodbye