Hi,
It's possible to make tiles as beautiful as this...
http://news.povray.org/web.453705254259a6395c4e856a0%40news.povray.org
.... just using a bump_map?

I tried with this file...
http://www.noctua-graphics.de/images/download/tex/tiles/tilebump.jpg
.... and this pov code:
texture
{
  pigment { rgb 1 }
  finish {
    diffuse 0.9 ambient 0.0
    specular .8 roughness .01
    reflection { 0.05,.1 falloff 2 exponent .8 }
  }
  normal { uv_mapping bump_map { jpeg "c:tilebump.jpg" bump_size 10 } }
}

Thks,

JSR.

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