k3d/share/shaders/k3d_ceramictiles.sl:217:  normal Ntile =
k3d/share/shaders/k3d_ceramictiles.sl:220:  Ntile += 0.05 * (vector cellnoise(tileindex + 5) - 0.5);
k3d/share/shaders/k3d_ceramictiles.sl:221:  Nf = normalize(mix(Nf, Ntile, intile));
