k3d/share/shaders/k3d_hextile.sl:20: *    mortarwidth - the width of the mortar (in s-t units)
k3d/share/shaders/k3d_hextile.sl:53:	 float mortarwidth = 0.02;
k3d/share/shaders/k3d_hextile.sl:90:  mw2 = mortarwidth/2;
