k3d/share/shaders/k3d_smoke.sl:38:		  output color Lscatter; output float smoke)
k3d/share/shaders/k3d_smoke.sl:40:  Lscatter = 0;
k3d/share/shaders/k3d_smoke.sl:47:      Lscatter += Cl;
k3d/share/shaders/k3d_smoke.sl:55:      if(comp(Lscatter, 0) + comp(Lscatter, 1) + comp(Lscatter, 2) > 0.01)
