k3d/share/shaders/k3d_softboxes.sl:128:    uniform float oW = max(bW,bw2);
k3d/share/shaders/k3d_softboxes.sl:135:	contrib = 1 - clipSuperellipse (Pplane, iW, iH, oW,oH, boxRoundness);
k3d/share/shaders/k3d_softboxes.sl:139:	    varying float theS = (oW+xcomp(Pplane))/(oW*2);
