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With your curve(s) complete, you can now create a flex, which is the 3-D splined curve that will be made to match the curve animation. The flex will be created in 3-D in a position that approximately matches its actual position and shape. It is usually most convenient to open the Quad view, so that you can see the camera view at the same time you create the flex in one of the 3-D views (such as the Top view).
Click the New Flex button, then begin clicking in the chosen 3-D view to lay out a succession of control points. Right-click to end the mode. You can now adjust the flex
control points as needed to better match the curve. You should keep the flex somewhat shorter than the curve.
Tip: control points can be placed on a mesh, with or without snapping, using the Perspective View’s normal Place Mode.
Tip: You can use the 3-D panel and Hierarchy View to modify standard attributes of a Flex, such as its color, lock status, or whether or not it is tagged as exportable.
To attach the curve to the flex, select the curve in the camera view, then, on the flex control panel, change the parent-flex list box for the curve to be your flex. (Note: if you create a flex, then a curve while the flex is still selected, the curve is automatically connected to the flex.)
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