k3d/share/shaders/k3d_fur2.sl:49:	 float spec_size_fade  = 0.1;
k3d/share/shaders/k3d_fur2.sl:104:    Kspec *= min( smoothstep( start_spec, start_spec + spec_size_fade, v),  
k3d/share/shaders/k3d_fur2.sl:105:		  1 - smoothstep( end_spec, end_spec - spec_size_fade, v ) );
