API Reference > OdDg Classes > OdDgBSplineSurface Class > OdDgBSplineSurface Methods > evaluate Method > OdDgBSplineSurface::evaluate Method (double, double, OdGePoint3d&, OdGeVector3d&, OdGeVector3d&)
OdDgBSplineSurface::evaluate Method (double, double, OdGePoint3d&, OdGeVector3d&, OdGeVector3d&)
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Syntax
C++
OdResult evaluate(double dU, double dV, OdGePoint3d& pos, OdGeVector3d& uDeriv, OdGeVector3d& vDeriv) const;
Parameters
Parameters 
Description 
double dU 
[in] u direction parameter.  
double dV 
[in] v direction parameter.  
OdGePoint3d& pos 
[out] A passed-in parameter for returning the evaluated position on the surface.  
OdGeVector3d& uDeriv 
[out] A passed-in parameter for returning the first derivative with respect to u.  
OdGeVector3d& vDeriv 
[out] A passed-in parameter for returning the first derivative with respect to v. 
Returns

Returns eOk if evaluation is successfully done. If the surface doesn't contain any NURBS information, returns eFail. If the u or v value is out of range, returns eOutOfRange.

Description

Evaluates the position and first derivatives on the NURBS surface at the specified parameter value (u, v). 

 

Remarks

This method is implemented only for Spatial modeler and returns eNotImplementedYet status for other modelers.

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