Shiny wooden floor
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The second BSDF works like a mirror (like in the plastic example), so keep a low Roughness value on this component. You could just increase the roughness value to avoid perfectly smooth reflections. For the image below the roughness was set to 15. If the floor is too reflective, the quickest way to change the amount of reflection is to lower the weight value of this BSDF.
The basic structure of a wood material. You can download this material example here.
Find more wood examples at the MXM Gallery.
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