k3d/share/shaders/k3d_uberlight.sl:109: *   raytraceshadow - if nonzero, cast rays to see if we are in shadow.
k3d/share/shaders/k3d_uberlight.sl:394:		     float raytraceshadow = 0, nshadowrays = 1;
k3d/share/shaders/k3d_uberlight.sl:500:	if(raytraceshadow != 0)
