k3d/share/shaders/k3d_spacecloud.sl:11: *   startPulse -- start of pulse function.
k3d/share/shaders/k3d_spacecloud.sl:49:  float startPulse = .2; /* .1 .2 .3 .01 */
k3d/share/shaders/k3d_spacecloud.sl:92:	Oi = value * smoothPulse2Fuzz (startPulse, endPulse, afuzz, afuzz, ss) * 
k3d/share/shaders/k3d_spacecloud.sl:93:		smoothPulse2Fuzz (startPulse, endPulse, bfuzz, afuzz, tt);
