k3d/share/shaders/k3d_grids.sl:26:color G1L2_GridColor=color(0,0,0); 
k3d/share/shaders/k3d_grids.sl:74:color G1L2_Ct = blend(G1L2_SurfaceColor, G1L2_GridColor, G1L2_layer_opac);
