k3d/share/shaders/k3d_square_ridges.sl:41:float filtered_pulse_train(float edge, period, x, dx)
k3d/share/shaders/k3d_square_ridges.sl:63:	float ridge_position = filtered_pulse_train(0.5 / Frequency, 1.0 / Frequency, t + (Offset / Frequency), filter_width(t));
k3d/share/shaders/k3d_warningstripes.sl:29:float filtered_pulse_train(float edge, period, x, dx)
k3d/share/shaders/k3d_warningstripes.sl:50:	float stripe_position = filtered_pulse_train(0.5 / Frequency, 1.0 / Frequency, u+v, filter_width(u+v));
