k3d/share/shaders/k3d_hextile.sl:21: *    tilevary - the color variance from tile to tile
k3d/share/shaders/k3d_hextile.sl:54:	 float tilevary = 0.15;
k3d/share/shaders/k3d_hextile.sl:110:  Ctile = tilecolor * (1 + tilevary * snoise(tileindex+0.5));
