k3d/share/shaders/k3d_stones.sl:24: * minfreq & maxfreq = limits to the rock loop excecution
k3d/share/shaders/k3d_stones.sl:87:    float minfreq = 1,
k3d/share/shaders/k3d_stones.sl:113: for (freq = maxfreq ; freq>minfreq;freq -=0.5)
