k3d/share/shaders/k3d_grids.sl:42:color G2L2_GridColor=color(0,0,0); 
k3d/share/shaders/k3d_grids.sl:93:color G2L2_Ct = blend(G2L2_SurfaceColor, G2L2_GridColor, G2L2_layer_opac);
