k3d/share/shaders/k3d_eyeball.sl:19: *   bloodshot - controls how bloodshot the eye is (0=no blood, 1=very ugly)
k3d/share/shaders/k3d_eyeball.sl:55:	 float bloodshot = 1.0;
k3d/share/shaders/k3d_eyeball.sl:85:  bloody = bloodshot * (smoothstep (-irissize, 2.5*irissize, tt));
