Cross section (X section) for Boss, Side, or Pocket

You can define the shape of the walls of a Boss, Side, or Pocket feature by specifying a cross-section curve. This curve is swept along the curve of the feature to create the overall shape. The curve must be:

The curve must be a function in X and Y. This means that when you draw a vertical line parallel to the X or Y-axis through the curve at any point, it can only intersect the curve once.