k3d/share/shaders/k3d_shifteddrtile.sl:13: *	outerRadius - outer ring
k3d/share/shaders/k3d_shifteddrtile.sl:54:	uniform float outerRadius = 0.45;   /* outer ring */
k3d/share/shaders/k3d_shifteddrtile.sl:91:		mix_opacity = smoothPulse (innerRadius, outerRadius, fuzz, d);
k3d/share/shaders/k3d_shifteddrtile.sl:94:		mix_opacity = 1 - smoothstep (outerRadius-fuzz, outerRadius+fuzz, d);
