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<FONT CLASS=title><CENTER>Interactive Spline</CENTER></FONT>
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 Demonstrates the support for splines in DirectAnimation, including: <br>
 - the correspondence between a path and behavior cubic splines, <br>
 - the use of draggable points for making the spline interactive <br>
 - the use of the derivative operation for obtaining the spline tangent <br>
 - animating a sprite along the spline with the orientation of the tangent <br>

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