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Creating a Realistic Marble Material
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.. figure:: material_marble.png 
    :align: center 

    **Marble material**

Main parameters:

    * Marble diffuse texture
    * Reflection color set to light grey (0.7-0.9)
    * Fresnel enabled
    * IOR set to 2.0 - 2.5

This setup uses ``RED::IMaterial::SetupRealisticMaterial`` to produce a marble. The marble has a diffuse texture that contains the color of its veins. Then, as a marble is generally a well polished surface, we won't setup any surface modification map (no displacement, no bump). Reflections are quite strong over a marble surface, so we set the reflection color quite high. Then, we can adjust the reflectance by controlling the IOR. Increasing the IOR value will strengthen reflections.