k3d/share/shaders/k3d_luna.sl:42:		 float peak_rad = .0075, inner_rad = .01, rim_rad =
k3d/share/shaders/k3d_luna.sl:104:  if(pd < peak_rad)
k3d/share/shaders/k3d_luna.sl:106:      uu = 1 - pd / peak_rad;
k3d/share/shaders/k3d_luna.sl:135:      if(pd < peak_rad)
