k3d/share/shaders/k3d_graphic_lines.sl:90:	color Ci_highlight = Ci;
k3d/share/shaders/k3d_graphic_lines.sl:161:	Ci_highlight=surface_opac_highlight*color_curve_highlight;
k3d/share/shaders/k3d_graphic_lines.sl:355:	layer_color = Cs*(Kd*diff*Ci_paint + Ka*ambient()) + Ci_highlight*Ks*spec;
