//  Rough stone texture
//  Requires 
//    tx_color
//  Defines
//    tx_texture

#declare tx_texture = 
  texture{ 
    pigment{ color rgb tx_color }
    finish{ 
      ambient 0.1 
      diffuse 0.9 
      specular 0.50 roughness 0.17
      metallic 0.25
      brilliance 2.5
    }
    normal { granite 0.30 }
    scale 0.30
  }