k3d/share/shaders/k3d_graphic_lines.sl:96:	color layer_opac_highlight;
k3d/share/shaders/k3d_graphic_lines.sl:152:	layer_opac_highlight=color(val_highlight);
k3d/share/shaders/k3d_graphic_lines.sl:153:	surface_color_highlight=((surface_color_highlight)*(1-(layer_opac_highlight))+(layer_color_highlight)*(layer_opac_highlight));
