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This method will work just fine for materials that do not exhibit more than one main material feature such as paint and rust in this case, both are visually relatively simple.

For material exhibiting at least 2 radically different materials (such as paint and shiny metal for example), we recommend the Advanced method.

 

Let's take a look at the Substance Painter sample Fire Hydrant model.
We simply baked all textures and applied the 'Machinery' free smart material from http://share.allegorithmic.com

 

If we just export the project's textures, here what we get:

Base_Color.pngHeight.pngMetallic.pngMixed_AO.pngNormal.pngNormal_OpenGL.pngRoughness.png

 

We can ditch the Normal.png, as it is the Normal_OpenGL.png that we want.
We can also ditch the Mixed_AO.png, as I suppose this is to add better contact shadows for a game engine use, which we get naturally in a global illumination path tracer such as Arion Render.

 

So we are left with:

Base_Color.pngHeight.pngMetallic.pngMixed_AO.pngNormal_OpenGL.pngRoughness.png

 

The Base_Color texture obviously goes into our Arion BSDF's Color channel

BRDF attributes
Fresnel IOR 1.51 0.0
Falloff 46.5 16
Color
Edgetint
Roughness | % 100
Bump | % 10

 

Next thing is to enable Coatings and plug the Roughness.png texture to the Coatings Roughness channel.

Coatings
Enable
Thin-film
Fresnel IOR 1.51
Color
Edgetint
Roughness | % 10
Thickness | nm 250 1000

 

The evident problem here is that we have good reflection and roughness on the paint, but the rusty parts are fully washed-out.

The reason is that coatings are so rough there, that they occlude the rusty part.

Coatings
Enable
Thin-film
Fresnel IOR 1.51
Color
Edgetint
Roughness | % 10
Thickness | nm 250 1000
RGB modifiers
Invert
Gamma | % 0
RGB | % 0 0 0
Clamp | % 0 100
Brightness | % 0
Contrast | % 0
Saturation | % 0

 

And then we can bring back the bump using the normal texture with a value of 100%, as normal maps represent the full height and need to be used with a 100% value.

BRDF attributes
Fresnel IOR 1.51 0.0
Falloff 46.5 16
Color
Edgetint
Roughness | % 100
Bump | % 100
Control attributes
Path path/to/bitmap/Normal.png ...
Mode Read as normal map
Interpolation

 

 

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