k3d/share/shaders/k3d_shifteddrtile.sl:12: *	innerRadius - inner ring
k3d/share/shaders/k3d_shifteddrtile.sl:53:	uniform float innerRadius = 0.3;    /* inner ring */
k3d/share/shaders/k3d_shifteddrtile.sl:91:		mix_opacity = smoothPulse (innerRadius, outerRadius, fuzz, d);
