k3d/share/shaders/k3d_gooch.sl:42:    float ldotn, blendval;
k3d/share/shaders/k3d_gooch.sl:48:        ldotn = (normalize(L)).Nf;
k3d/share/shaders/k3d_gooch.sl:49:        blendval = 0.5*(1+ldotn);
