k3d/share/shaders/k3d_fresnelplastic.sl:32:   float ior = 0;
k3d/share/shaders/k3d_fresnelplastic.sl:82:    if (ior != 0) {
k3d/share/shaders/k3d_fresnelplastic.sl:83:      fresnel (normalize (I), Nf, (I.Nf > 0)? ior: 1/ior,
k3d/share/shaders/k3d_shinyplastic.sl:8: *    ior - index of refraction (1.5 is a good estimate for most plastics)
k3d/share/shaders/k3d_shinyplastic.sl:28:			 float Kr = 1, blur = 0, ior = 1.5;
k3d/share/shaders/k3d_shinyplastic.sl:35:    MaterialShinyPlastic(Nf, Cs, Ka, Kd, Ks, roughness, Kr, blur, ior,
k3d/share/shaders/k3d_uberlight.sl:409:   * light, you transform the coordinate system in the RIB stream, prior
