k3d/share/shaders/k3d_rustymetal.sl:56:  float alimit;                /* Limit sum to do simple antialiasing */
k3d/share/shaders/k3d_rustymetal.sl:65:  alimit = sqrt (area(PP));
k3d/share/shaders/k3d_rustymetal.sl:66:  for (i = 0;  i < MAXOCTAVES  &&  a > alimit;  i += 1) {
