k3d/share/shaders/k3d_superplank.sl:103:  float adjustedKs;
k3d/share/shaders/k3d_superplank.sl:257:  adjustedKs = Ks * (1 + .2 * ring) * (1 + .3 * grain) * groovy;
k3d/share/shaders/k3d_superplank.sl:314:    adjustedKs * (specularcolor * Cspec);
