Material Editor > Standard material > Shader Basic Parameters rollout > Strauss shader > Maps rollout > Metalness button
You can select a bitmap file or procedural map to control the Metalness parameter. White pixels in the map increase metalness. Black pixels reduce metalness to 0. Intermediate values adjust metalness accordingly.
The metalness parameter is available with the Strauss shader.
Reducing the Amount of the metalness map reduces the map's effect, and increases the effect of the Metalness value on the Basic Parameters rollout. When the Amount is 0 percent, the map isn't used at all.
To map the metalness value:
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Click the Map button for Metalness.
The Material/Map Browser is displayed.
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Choose from the list of map types, and then click OK.
The Material Editor is now at the map level, and displays controls for the map parameters.