k3d/share/shaders/k3d_uberlight.sl:29: *   cuton, cutoff - define the depth range (z range from the origin, in
k3d/share/shaders/k3d_uberlight.sl:33: *       for the cuton and cutoff.  The transitions will be smooth.
k3d/share/shaders/k3d_uberlight.sl:289:  /* Examine the z depth of PL to apply the (possibly smooth) cuton and
k3d/share/shaders/k3d_uberlight.sl:374:		     float cuton = 0.01, cutoff = 1.0e6, nearedge =
k3d/share/shaders/k3d_uberlight.sl:458:      ShapeLightVolume(PL, lighttype, axis, cuton, cutoff, nearedge, faredge,
k3d/share/shaders/k3d_uberlight.sl:495:	  shadoworigin = point "shader"(xcomp(PL), ycomp(PL), cuton);
