API Reference > OdGe Classes > OdGeSurface Class > OdGeSurface Methods > evalPoint Method > OdGeSurface::evalPoint Method (OdGePoint2d&, int, OdGeVector3dArray&, OdGeVector3d&)
OdGeSurface::evalPoint Method (OdGePoint2d&, int, OdGeVector3dArray&, OdGeVector3d&)
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Syntax
C++
OdGePoint3d evalPoint(const OdGePoint2d& param, int numDeriv, OdGeVector3dArray& derivatives, OdGeVector3d& normal) const;
Parameters
Parameters 
Description 
const OdGePoint2d& param 
[in] The parameter pair to be evaluated.  
int numDeriv 
[in] Maximum order of derivatives to be computed.  
OdGeVector3dArray& derivatives 
[out] Receives an array of derivatives at the point corresponding to param.  
OdGeVector3d& normal 
[out] Receives the normal at the point corresponding to param. 
Description

Returns the point corresponding to the parameter pair, as well as the derivatives and the normal at that point. 

 

Remarks

If numDeriv is 1, then derivatives are ordered: du, dv If numDeriv is 2, then derivatives are ordered: du, dudu, dv, dvdv, dudv numDeriv >= 3 is not supported 

By default this function throws exception "not Implemented". Should be implemented in derived classes.

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