k3d/share/shaders/k3d_grids.sl:57:float blend_val=0.5; 
k3d/share/shaders/k3d_grids.sl:97:Ci = (blend_val*G1L1_Ct+(1-blend_val)*G1L2_Ct) * (ambientcolor * K_ambient * ambient() + K_diffuse * diffuse(G1_Nf)) + 
k3d/share/shaders/k3d_grids.sl:99:Oi = (blend_val*G2L1_Ct+(1-blend_val)*G2L2_Ct);
