k3d/share/shaders/k3d_rustymetal.sl:57:  float rustiness;             /* Result: how rusty is this point? */
k3d/share/shaders/k3d_rustymetal.sl:77:  rustiness = step (1-rusty, clamp (sum,0,1));
k3d/share/shaders/k3d_rustymetal.sl:78:  rustiness *= clamp (abs(snoise(PP)), 0, .08) / 0.08;
k3d/share/shaders/k3d_rustymetal.sl:79:  rustiness *= rustiness;
k3d/share/shaders/k3d_rustymetal.sl:84:  if (rustiness > 0) {
k3d/share/shaders/k3d_rustymetal.sl:91:  if (rustiness < 1) {
k3d/share/shaders/k3d_rustymetal.sl:98:   * of the rustiness.
k3d/share/shaders/k3d_rustymetal.sl:101:  Ci = Oi * mix (Cmetal, Crust, rustiness);
