k3d/share/shaders/k3d_superplank.sl:14: *   Ktrace, Krefl, reflmap - const for trace, for refl map, filename
k3d/share/shaders/k3d_superplank.sl:58:			float Ktrace = 1, Krefl = 0;	/* trace and reflection map */
k3d/share/shaders/k3d_superplank.sl:326:      if(Ktrace > 0)
k3d/share/shaders/k3d_superplank.sl:327:	Ci += Ktrace * fresnelKr * specularcolor * trace(P, R);
