k3d/share/shaders/k3d_oakplank.sl:17: *   Cgroove - color of the grooves between the planks
k3d/share/shaders/k3d_oakplank.sl:114:		     color Cgroove = color(0.02, 0.02, 0.02);
k3d/share/shaders/k3d_oakplank.sl:148:  Cwood = mix(Cgroove, Cwood, inplank);
