k3d/share/shaders/k3d_lensflare.sl:23: *   rainbowradius, rainbowwidth - size of the rainbow
k3d/share/shaders/k3d_lensflare.sl:95:		      float rainbowradius = 0.5; float rainbowwidth = 0.2;
k3d/share/shaders/k3d_lensflare.sl:171:	  rainbow((dist / rainbowradius - 1) / rainbowwidth,
k3d/share/shaders/k3d_lensflare.sl:172:		  (dPndc / rainbowradius) / rainbowwidth);
