This filter lets you change the way your curves are shaped according to three parameters: tension, continuity, and bias.
The tension of the curve is a measure of how tightly it snugs up to the anchor points. At a tension of 100%, the curve is essentially a straight-edged polygon. At other values, the curve will smooth out.
The continuity of the curve represents how the left edge of a curve flows into the right edge of a curve through an anchor point. At 100%, the curve is smooth. At less than 100%, the curve will bow inward; at more than 100%, it will bow outward.
The bias indicates whether the curve bulges to the left or to the right of the anchor point. At 100%, the bulge is in the middle. At less than 100%, it's to the left; at more than 100%, it's to the right.
