k3d/share/shaders/k3d_graphic_lines.sl:16:        float contrast_highlight=1.0;
k3d/share/shaders/k3d_graphic_lines.sl:137:	illumination_highlight=(illumination_highlight*contrast_highlight)+(1.0-contrast_highlight)/2.0+(brightness_highlight-1.0)+n_highlight*randomness_highlight;
