3D Compositing in Fusion Part 5 Video Lecture | Eyeon Fusion: A Practical Hands On Course - Professional Skills

all right so one of the things that I
needed in fusion was the 3d environment
because I wanted to really light this
room and for that there are different
ways to do this let me just show you the
one that I didn't choose which is fairly
exciting though I just don't have a
computing power even though this
computer has 24 GB of RAM NVIDIA Quadro
mm but still it wasn't enough to do what
I'm just about to show you it but it's
fairly exciting so I remember I said
that this values color values here
indicate the point in space right at the
3d value of that point in space so
Fusion can use this to create the scene
here and that's the part that is fairly
exciting let me just show you what I
mean let's create an image plane like a
simple image plane which is a 3d object
in the infusion and I'll just scale it
up a little bit so you can see in fact
let's do 15 alright so here is the here
is the object that I just created it's
at the origin right and you know
generally just looking at cynthaiz and
maya where this origin exists in a room
now how do you make the entire room out
of this right for that there is an old
core displays 3d node so displaced 3d
node is supposed to give you the
displacement as you see it inside the
room this will become very clear very
soon but let me do this first let me
look at the camera and apply that to the
displacement node and create a merge and
this merge I'll just I'm going to delete
this eventually but let me just show you
where everything is right and I'm not
going to look through this cable to see
perspective so now you see where the
camera is which you kind of roughly knew
and where the object is so
look at this particular object here as I
apply the distortion driven by the color
values of this node here so soon as I do
that and one thing I need to do is
displace RGB in an absolute sense so
that image plane that was here has
turned into something like this which
doesn't really make a lot of sense I can
see that looks like there is a room here
and there is the door here but I really
can't use this now that's because this
object here is divided into ten
subdivisions as I increase the
subdivision levels you can see the
displacement forming more into a shape
that you recognize right so at 40 you
kind of see there oh I see now I see
that there is a sofa here it looks like
there is a table here there's a TV here
right but you need much more than that
so at 250 it becomes much more clear you
can see the connector blue is walking
you know and this is all created instead
of fusion now what you can do is take
this camera here and apply your
backplate I'm just gonna use this one
for now and apply that to the camera and
now there is a projection going on from
this camera on to this object right so
now you can see everything is lit and
textured properly when you see it
through the camera itself right you
don't even see any difference you see
that oh okay yeah this is the this is
the shot tonight you know I was looking
at earlier but it's actually just a
projection on the 3d object so now you
can imagine that if I wanted to have a
life let's create a spotlight control
space and create a spotlight and merge
this spotlight
in to merge Road which is here so here's
the light you can see that this light is
actually showing you the object now blue
is kind of hidden there because you know
I didn't really have a texture of blue
inside of the back plate and and this is
the reason why I had created the room by
itself you know when I show you it
showed you in Maya but then I ended up
replacing it with the one with blue
because I just wanted to use the Volt
position pass for other purposes that
I'll show you but for the recreation of
the 3d shot here but you can see that as
I am moving my my light here you know it
is actually lining up with the geometry
that is displaced now it's not perfectly
lined up because we are dividing this
image plane into two hundred and fifty
let's divide this into five hundred now
it's much tighter and much better right
you can see that the light is now
defining the object you know and the
light is actually showing you the the
part you can see the so far here right
you can see you know this part here of
the window right a very powerful way of
working inside of fusion based on the 2d
image and and that's the exciting part
that it's nothing more than just a 2d
image you know it's color values right
but it's driving the whole 3d
environment inside of fusion to give you
displacement that is matching your room
the problem for me anyway using my
computing power or limitation of my
computing power
is that you need to have a lot of points
here in theory this shot is 1280 by 720
right so if multiply there that's number
of pixels that you have in the shot and
that's the number of points that you
need here to have the accurate
representation of the of the geometry
and that is a lot of subdivision your
machine is gonna my machine is gonna
crawl anyway so this while an exciting
way of looking at 3d this wasn't a
viable option for me so I didn't choose
to go this route with well-positioned
paths
let me just delete all the nodes that we
don't need here and I'll walk you
through what I ended up doing which is
also equally exciting so what I did is
instead I brought an FBX file from my I
itself I need to run this off here so
you can see the FBX file so this is the
geometry that was created inside of Maya
and we walk through that and this is
exactly the same geometry that you see
here as an FBX file so now you have the
entire room here a much more defined
geometry at a very manageable level of
subdivision right you know I don't even
know if there is actually a way to look
at subdivision in FBX but you don't have
to put through all those points you know
to to really have this you know fine
edges now let's look at this
into the scene here let's look at this
from your camera connect this so you can
see the texture so now you see that you
have a and I'll go back to the
perspective so you can I can show you
you know what you're looking at this is
exactly the same room that you were just
looking at without the gesture now you
have the projected texture on it right
the same way that we looked at
projection earlier and you have the
lights you know exactly the same way
that you saw the lights in the other way
you know using the wall position pass so
now you can change this light you know
move it anywhere and it will respect you
know what you have in mind in terms of
you know where it should light look at
you know in terms of your your geometry
and you can see that these doorknobs
here you know even they show the
specular you know values as soon as you
move the light on that and that's
because of the geometry that we created
inside of Maya okay so I'm running out
of time here so I'll continue in the
next video and we'll just continue from
here thanks a lot