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The modeler moves control point positions based on inputs such as loads, constraints, and material properties. Figure 1-2 shows a sample curve defined by interpolating four constraint points (shown as magenta squares). The curve is deformed by moving one of the interior constraint points through a sequence of positions. The curve's control points are shown (as blue dots) for the first and last shape in the sequence. In this example, moving one constraint point drives the deformable modeling algorithm, which moves all the control points to continue interpolating all the constraint points and to keep the curve fair. Any number of point constraints can be added to a curve placed at any position on the curve.
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