k3d/share/shaders/k3d_superplank.sl:107:  vector R, T_dummy;		/* Refl (and tummy transmit) from fresnel */
k3d/share/shaders/k3d_superplank.sl:297:  fresnel(IN, Nf, 1 / eta, fresnelKr, fresnelKt, R, T_dummy);
