All language subtitles for CustomMetahuman_3_Bonus1.mp4

I have shown you how to deal with the base color
and normal maps of the metahuman.

However, sometimes it is also necessary

to change the roughness,
metallic and emission textures as well.

For example,
for some cyberpunk or scifi characters.

So here is how to do that.

To demonstrate this,
I imported my metahuman base mesh

to Substance Painter,
and I will do some rough

freestyle design with some metal elements
and some emission parts.

Just bear with me for a minute.

All right.

I'm finished in Substance Painter
and want to export my textures now.

Before we do that,
let's make sure that for our roughness map

everything that is part of
the original body is set to 1,

which means zero glossiness.

This is important because we
want to use our roughness map as a mask.

So if the body receives any value
less than one from the new roughness map,

it will become more glossy than it's
supposed to be.

Now, let's export our textures.

We can use the Unreal Engine template,

which will pack the occlusion, roughness
and metal map into one texture.

This is called the ORM textures, where the ORM

corresponds to the RGB
channels of the texture map.

That means the red channel
stores the occlusion data,

the green channel the roughness map,
and the blue channel the metallic map.

I then renamed the textures for head and
body and imported them into Unreal Engine.

For each, we have four maps:
The base color, emission, normal

and the ORM Texture Map.

Let's first assign the

color and normal maps in the material
instances of head and body.

You already know how to do that.

Now for the rest,
we need to change the master materials.

The master material

for the head is called M_Head_Baked.

Let's make a duplicate
before we make substantial changes

to the master material.

I'll call it M_Head_ORM.

Open it up.

First, let's create a texture parameter
for our roughness and metallic maps.

We will want to control the roughness
intensity in the material instance.

So we will multiply the green channel,
which is our roughness map,

with a constant parameter.

Now we can lerp our new roughness map
with the original Metahuman roughness input.

Now we can lerp our new roughness map
with the original Metahuman roughness input.

Finally, we need a mask to separate
the body textures from our new roughness input.

For this, we use the green channel again,
but we have to invert it,

since the mask has to be white
in the areas that will receive

new roughness information.

Metallic is more straightforward,

as it is either one or zero.

We can just lerp the blue channel
with the original metallic input,

and use the blue channel as the mask.

Now to the emission map.

Duplicate the texture parameter
and call it "Emissive"

For the emission,
we would like to control

the emission color and intensity.

So we multiply it first with a constant3vector
and set it to white,

and then multiply it by a constant
for the emission intensity.

Plug it into the emission
input of the material, apply, and save.

We can now copy

all the nodes that we added,
duplicate the body master material,

and open it up, and paste the nodes
into the body material.

Connect the original roughness
and metallic inputs into the lerp nodes,

and plug them all in

Oh, and don't forget

to assign the new master materials
we created instead of the original ones.

We now have all the necessary parameters

exposed in the material instances
of head and body.

Assign the emission and ORM maps,
change the values for emission intensity

and roughness intensity to your liking
and you are good to go.

That's it.

We now have a Cyborg! :-)