k3d/share/shaders/k3d_softboxes.sl:129:    uniform float oH = max(bH,bh2);
k3d/share/shaders/k3d_softboxes.sl:135:	contrib = 1 - clipSuperellipse (Pplane, iW, iH, oW,oH, boxRoundness);
k3d/share/shaders/k3d_softboxes.sl:140:	    varying float theT = (oH-ycomp(Pplane))/(oH*2);
