Hello to all,

I am trying to make an animation on a very low level, simulating the
movement of sand dunes. I tried to make it this way:

plane {
y, 0
  texture {
    pigment {
    bumps
    color_map {
    [0.00 Yellow*0.1 ]
    [0.25 Yellow*0.3 ]
    [0.55 Yellow ]
    [1.00 Yellow*0.6 ]
    } scale <0.5,1,1.5> }
    normal { bumps 30 phase clock  scale <0.5,1,1.5> }
    finish{
      diffuse 0.8
      ambient 0.1
    }
  }
}


when replacing "bumps" with "gradient" or "marble" or other patterns, I can
see the effect I expected, but with bumps there is only an effect in the
background, near the horizon, and in the foreground happens nothing.

What am I making wrong?

TIA

Rm

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