k3d/share/shaders/k3d_softboxes.sl:214:    float	edgeRolloff = 0,
k3d/share/shaders/k3d_softboxes.sl:459:	    if (edgeRolloff > 0) {
k3d/share/shaders/k3d_softboxes.sl:462:		q = 1 - clamp(edgeRolloff*pow(clamp(abs(q),0,1),1/max(edgeExp,0.001)),0,1);
