API Reference > OdDb Classes > OdDbXline Class > OdDbXline Methods > OdDbXline::getFirstDeriv Method
OdDbXline::getFirstDeriv Method
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Parameters |
Description |
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double param |
[in] Parameter value specifying the point on the infinite line as a Double value. |
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OdGeVector3d& firstDeriv |
[out] Reference to a variable in which this method must save the first derivative as three-dimensional vector instance. |
Computes the first derivative for the specified parameter of the infinity line entity and returns the three-dimensional vector instance. The first derivative is constant for any point of the infinite line.
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