k3d/share/shaders/k3d_superplank.sl:108:  float fresnelKr, fresnelKt;	/* Fresnel reflection coefficients */
k3d/share/shaders/k3d_superplank.sl:297:  fresnel(IN, Nf, 1 / eta, fresnelKr, fresnelKt, R, T_dummy);
k3d/share/shaders/k3d_superplank.sl:298:  fresnelKr *= Kr;
k3d/share/shaders/k3d_superplank.sl:313:    (1 - fresnelKr) * (Ct * (Ka * ambient() + Kd * diffuse(Nf))) +
k3d/share/shaders/k3d_superplank.sl:317:  if(fresnelKr > 0.001)
k3d/share/shaders/k3d_superplank.sl:323:	    fresnelKr * specularcolor * texture(reflmap, xcomp(Pndc),
k3d/share/shaders/k3d_superplank.sl:327:	Ci += Ktrace * fresnelKr * specularcolor * trace(P, R);
