k3d/share/shaders/k3d_displacementmap.sl:6:  point N1, N2;
k3d/share/shaders/k3d_displacementmap.sl:13:  N2 = calculatenormal(P);
k3d/share/shaders/k3d_displacementmap.sl:14:  N = normalize(N) + normalize(N2) - normalize(N1);
k3d/share/shaders/k3d_srfdeformation.sl:61:    normal N1, N2;
k3d/share/shaders/k3d_srfdeformation.sl:78:    N2 = faceforward(normalize(N),I);
k3d/share/shaders/k3d_srfdeformation.sl:89:    illuminance(Porig, N2, radians(illum_width)) {
k3d/share/shaders/k3d_srfdeformation.sl:90:	Ci2 += Kd * fnc_mydiffuse(Cl,L,N2);
k3d/share/shaders/k3d_volcube.sl:169:fnc_normalMix (normal N1; normal N2; float mixer)
k3d/share/shaders/k3d_volcube.sl:172:    float N2_mag = 1;
k3d/share/shaders/k3d_volcube.sl:174:    normal NN2 = normalize(N2);
k3d/share/shaders/k3d_volcube.sl:177:    N2_mag *= mixer;
k3d/share/shaders/k3d_volcube.sl:178:    result = normalize(NN1 * N1_mag + NN2 * N2_mag);
