k3d/share/shaders/k3d_ruledpaper.sl:11: *   linestr - how strongly do the lines show up (0.0 to 1.0)
k3d/share/shaders/k3d_ruledpaper.sl:45:	float linestr = 1;
k3d/share/shaders/k3d_ruledpaper.sl:109:		tex = (tex*(1-linestr)) + (color(0.2,0.8,0.8) * linestr);
