All language subtitles for Nuke Compositing for 3D Artists week 2 - Classroom - CG Master Academy_6

uh in this video

we're going to look at the Motion Blur 2D

and Motion Blur 3D Notes in nuke

and um essentially the

they are pretty much what the name say

um we'll start out with Motion Blur 2D

and with to grab that

we'll just go type in Motion Blur 2D

and we'll grab this Motion Blur 2D note right here

so you could see it's got two inputs

the first input will be

the image you wanna apply Motion Blur to

and a second input is a 2D transform it wants um

so it could use that data to calculate the motion blur

so what we'll do is we'll plug in

in this case

um using our sky image that we were using earlier

so here's our sky image

we'll plug that directly into the Motion Blur 2D node

and then the second

second input

we're gonna grab our tracker

so we could either do our transform match move

or we could do the tracker

it really doesn't matter

um in this case

we could just do our transform match move

since it's already in our stream

so what I'm gonna do is put a dot down um

put a dot here

and plug that in as our second transform input

so now if we view this Motion Blur 2D note

it's not doing anything

if I disable and enable

it doesn't do anything

and all this note is doing is taking the 2D coordinates

um the translation that

that we've gotten from our match move here

it's taking that and it's generating um

emotion a over here

so a U and a V coordinates um

and it's setting the shutter for us

so that's all this note is doing

so in order to actually

see what this motion blur is doing

we need to use a note called Vector Blur

and if we grab that it's just Vector Blur

and if we plug this directly into

our Motion Blur 2D node

and plug this in our stream

so the uh the vector blur note

if you look at it now um

it's got channel selection

so it can motion blur all the channels or in this case

for us just for the sake of speed will just do RGBA

and the next option here is asking us what

UV channels we have

and since this motion blur node

is generating a motion a 0 V

in the vector blur for UV channel

we're gonna select motion

and if we view the Motion Blur 2D node

and if we go to our layer selection here

if we look at motion

you could see it's generated

um a motion pass

and normally this motion past the um

red would be your

your motion in an X

and the green would be your motion in y

so um in this case

since it was pretty much just the pan

um it's not

we don't really have much in the green channel to view

but it is there

um so once we've selected our UV channel as motion um

this is just the preset for the type of motion to

motion blur to apply

so we're gonna just leave it to Nuke's default

but if this was

a 3D render

um we could actually select

um render man or Arnold

um or Vere to make sure our motion blur

is as close to accurate as what those softwares

uh renders are

but in our case we'll just leave this at nuke scan line

and then the main thing is just

setting this motion amount to

1 to get just the default motion blur

so now if you look at this vector blur node

it's hard to see

because there isn't a whole lot of motion in this shot

because it's just a slow pan

but if I increase this motion blur say to five

and

let's just go extreme we'll go 12

and if I enable and disable this

you can see we are

getting actually a bit of motion blur in this image

and let's to help this out what I'll do is I'll

add a little bit of contrast in this image

just so we could see it a little bit easier

that should help visually see

so now if you look at this vector blur node

you could see we're getting motion blur

in our image and it's all coming from our 2D transform

if we go to another frame

and again disable and enabled

you could see we're getting Motion Blur applied

so that's the Motion Blur 2D node

the other option is Motion Blur 3D

and this image this node similar to the Motion Blur 2D

except instead of using a 2D transform note

whether it's a tracker or transform it uses a 3D camera

so what I'm gonna do is disable this and unplug

disable our Motion Blur 2D

and what I'll do is I'll plug in

the Motion Blur 3D node

and since we solve for a 3D camera in this

earlier video with our camera tracker

I could just clone this

and plug this camera into

the camera input of the Motion Blur 3D note

and similar to the Motion Blur 2D

this one is gonna output a motion pass for us too

um we don't necessarily need to

adjust the distance and shutter any of these things

um but using this now we could use the Vector Blur node

and again like our previous example

if we enable and disable

you could see we're getting motion blur

applied to our image

but this time it's using our camera translations

for the motion blur

so that's quite handy way of

applying motion blur to your image

um using either your 3D camera or using

the 2D transform from your tracker

to apply motion blur to an image

there's also um

what we're gonna look

at in an upcoming video will be using

rendered velocity data from a 3D render to apply

motion blur using the same vector

vector blur node

that will be in the upcoming video um shortly