es a new Spline.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>controlPointProportions</code> - the proportion along the curve, from 0->1
                        that each control point lies on</dd>
<dd><code>positions1D</code> - the co-ordinate position in the current dimension that
                        each control point lies on</dd>
</dl>
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</ul>
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</ul>
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