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Gets some position along the curve, between the starting and ending positions.
- Remarks:
- Depending on the derived type and its implementation, this may be a computed value, or a persisted value used as part of the definition of the curve segment. This position is the only means to deduce the curve segment's orientation in some cases, such as when it is closed or vertically aligned ('on edge' when looking along the Z axis).
- Returns:
- Returns a midpoint on the curve
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