k3d/share/shaders/k3d_srfdeformation.sl:64:    point Porig = Pref;
k3d/share/shaders/k3d_srfdeformation.sl:73:    /* Calculate shading difference between P and Porig*/
k3d/share/shaders/k3d_srfdeformation.sl:77:    N = normalize(calculatenormal(Porig));
k3d/share/shaders/k3d_srfdeformation.sl:89:    illuminance(Porig, N2, radians(illum_width)) {
