k3d/share/shaders/k3d_lunette.sl:51: *   sslinewidth, ttlinewidth - Width of the grid lines in ss and tt
k3d/share/shaders/k3d_lunette.sl:77:	float ttlinewidth;	/* proportional width of lines in tt */
k3d/share/shaders/k3d_lunette.sl:101:		1/ttrepeats, ttlinewidth, tt, filterwidth(tt)
