3D Compositing in Fusion Part 6 Video Lecture | Eyeon Fusion: A Practical Hands On Course - Professional Skills

all right so we looked at some 3d aspect
of fusion and we'll come back to this
this is the the room that we left
I think last don't pay attention to blue
and how he got in here will actually
walk through that just the room and the
lights and all that that we walk through
how the scene actually fits in here and
you have the geometry here the
projection you can see the projection
behind the wall here but you don't see
that when you are looking through the
camera right because this object is
blocking it but now you see how the
light is bouncing off of this the
objects you know you can see the light
bouncing off of the console here game
console and also you know some of the
other objects let's go back to the
volume tools you know go back to this
wall position Pass file again and see
how else can we use this inside fusion
for volume fog and volume masks so you
have here the file feeding into this
general boolean snowed into the
foreground and the background and for
channels color channels I'm saying do
nothing for all the RGB and alpha and
for auxiliary channels I am turning on x
position Y position and Z position which
is the information that is embedded in
this EXR file that came from maya so now
from channel billions it is taking into
this three nodes but before we go there
let's just create a new volume mask tool
and don't need it part of this network
you know just leave it here and feed
this into volume bars now I'm going to
turn my viewport into the two viewports
and here I'm going to see my W
be note for now and here I'm going to
see the volume mass now you don't see
any difference when you just start it
that's because it doesn't say mask only
it says that you know view everything so
now as soon as you say mask only you
just see the mask now here is by default
a mask created at zero zero zero value
right that's the RGB representation of
the origin so what we want to do is
actually let's create a little larger
size and now you see the 3d aspect of it
and use our picker tool here to pick a
position where you want this mask so
let's let's pick the position here just
to draw the point that you know how the
3d aspect works you can kind of see that
it's blocked by some of the geometry and
that's good that that would be you know
very handy in in a minute
now I'm going to go and choose this file
here as our source but before that I
want to apply something let's say we
want to do a color corrector feed this
into color connection node and let's
view that over here now we don't see any
any changed because we haven't really
done anything to the color correction
but before we do that I want to apply
this node volume mask as the effect mask
for color correction now as soon as you
play around with color correction you
note here that the color correction is
applied only to the part where the
volume mask is applied let's go back to
the volume mask and soft the image edges
a little
now this is great you can already see a
possibility that maybe there is a window
that is casting light inside the room
you know and there are all sorts of
applications that you can come up with
the one that I thought of as I had my
interest here into real lighting of the
scene is that without even going through
all these things that I did here you can
have a rough relighting happening right
here let's change the volume mask do a
sphere right and now you can imagine
that this may be a spotlight and what
I'm going to do is unlock X Y and C
values here for the scale and then
imagine that the light is coming from
the top right so here is the top going
to manage the X side of the 3d and going
to control the Z a little bit like this
and maybe you know move the whole light
into the Y position you can you know
make it go up or bring it down right so
now you have a representation of a light
coming from the top the thing is that
because we have in our wall position
pass blue walking through what I'm going
to do is bring blue the character which
is right here into the the shot that we
are building here right so this blue
let's branch him off for Chile I need to
zoom out further a bit okay so let's
let's branch him off and merge with this
one here right so now what you have is
blue you know walking through this
through this door now I'm not going to
actually
apply the mask here okay I'm going to
actually remove this note just bear with
me for a minute and apply it afterwards
right
I don't need another merge here delete
that and apply this to color correction
here's the color correction and I'm
going to now take the volume mask and
apply on to this node into the effect
mask right so now you have exactly the
same thing here that we saw earlier but
this is for the whole shot so now you
can see that the brightness and contrast
changed that you are applying here is
actually applied to the whole mask
including blue because blue is walking
through this light and as he walks
through you can see that he is
completely lit up and then you know now
he's outside of that lit up area now
he's in right now you can also change
the lighting too to show as to what just
normalize it color light do you want
right and you can see that color applied
to two blue himself as blue is half
inside this area half you know he still
is his head is in the air right his head
is not part of this wall but you can see
that you know the volume mask which is
covering this 3d space he is so
effective that you know it is even it
even has the implication here in this
air and as soon as something passes by
through that hair it's going to apply
the color correction on that surface and
as soon as that connector is out of the
the colorized area you lose the effect
so it's a very powerful tool from that
perspective you know you can do a lot of
different things and the beauty is that
as you scrub through this scene here you
can see that the the volume mask is
actually sticking to its position in the
3d space and that's that's very helpful
you know when you are trying to get into
the 3d compositing inside of fusion
alright so that's that and I'm going to
stop here
and in the next video we'll look at the
other tool which is the volume fog and
see you know how that volume fog is
applied and it's it's very powerful in
itself it has the input for 3d and the
lights also that will walk through all
right thanks a lot
you