API Reference > OdDb Classes > OdDbCurve Class > OdDbCurve Methods > getFirstDeriv Method > OdDbCurve::getFirstDeriv Method (OdGePoint3d&, OdGeVector3d&)
OdDbCurve::getFirstDeriv Method (OdGePoint3d&, OdGeVector3d&)
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Parameters |
Description |
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const OdGePoint3d& pointOnCurve |
[in] Point on the curve. |
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OdGeVector3d& firstDeriv |
[out] Receives the first derivative. |
Returns eOk if successful, or an appropriate error code if not.
Returns the first derivative of this Curve object at the specified WCS point.
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