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Brushed metals are often encountered in everyday's life and is a common material need in architecture and design.

In this tutorial we explore how we can reproduce that kind of material with Arion Render.

 

We start with a default Arion BSDF material.

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

 

Then we create a metallic material just like we did in the Create Simple Metal tutorial.
The only difference is that we used a first Fresnel IOR of 10 and added a secondary Fresnel IOR, the 'k' parameter and set it to 30. This creates slightly more realistic metals, which is discussed in another tutorial. 

BRDF attributes
Fresnel IOR 10 30
Falloff 46.5 16
Color
Edgetint
Roughness | % 10
Bump | % 10

 

Then here we need to add some direction to the reflections.
We will start by using a bump texture, after all those micro-scratches are actually tiny valleys on the surface.

We have used the following texture, created in Photoshop. The process is simple:

  • Create a 1024x8192px document
  • Select black and white as foreground and background colors
  • Hit Filter > Render > Clouds
  • Hit Filter > Blur > Motion Blur with a value of 256px
  • Resize the document to 1024x1024px.
  • Hit Filter > Others > Offset: 512x512px
  • Create a selection overlapping the hard transition area (where it won't tile well)
  • Hit Select > Modify > Feather and select a wide enough size, like 128px
  • Hit Filter > Blur > Motion Blur (same settings as before)
  • Hit Filter > Others Offset again
  • You texture should repeat perfectly now.



Tile your Bump texture accordingly to your needs (5x15 in this example).

BRDF attributes
Fresnel IOR 10 30
Falloff 46.5 16
Color
Edgetint
Roughness | % 10
Bump | % 10

 

Then to perfect this material a little, we have create a Roughness texture. It is done exactly the same way, same parameters as the Bump texture,
only using foreground and background colors in Photoshop that matches our roughness level needs. In short, RGB 15,15,15 and 50,50,50.

BRDF attributes
Fresnel IOR 10 30
Falloff 46.5 16
Color
Edgetint
Roughness | % 10
Bump | % 10

 

You can naturally do this as well for anisotropic reflections like those you can see on knobs tops.

 

 

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