k3d/share/shaders/k3d_displacementmap.sl:6:  point N1, N2;
k3d/share/shaders/k3d_displacementmap.sl:11:  N1 = 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:76:    N1 = faceforward(normalize(N),I);
k3d/share/shaders/k3d_srfdeformation.sl:85:    illuminance(P, N1, radians(illum_width)) {
k3d/share/shaders/k3d_srfdeformation.sl:86:	Ci1 += Kd * fnc_mydiffuse(Cl,L,N1);
k3d/share/shaders/k3d_volcube.sl:169:fnc_normalMix (normal N1; normal N2; float mixer)
k3d/share/shaders/k3d_volcube.sl:171:    float N1_mag = 1;
k3d/share/shaders/k3d_volcube.sl:173:    normal NN1 = normalize(N1);
k3d/share/shaders/k3d_volcube.sl:176:    N1_mag *= 1-mixer;
k3d/share/shaders/k3d_volcube.sl:178:    result = normalize(NN1 * N1_mag + NN2 * N2_mag);
