k3d/share/shaders/k3d_grids.sl:34:color G2L1_GridColor=color(0,0,0); 
k3d/share/shaders/k3d_grids.sl:85:color G2L1_Ct = blend(G2L1_SurfaceColor, G2L1_GridColor, G2L1_layer_opac);
