SurfaceEvaluator.getFirstDerivative Method

Parent Object: SurfaceEvaluator
Defined in namespace "adsk::core" and the header file is <Core/Geometry/SurfaceEvaluator.h>

Description

Get the first derivative of the surface at the specified parameter position.

Syntax

"surfaceEvaluator_var" is a variable referencing a SurfaceEvaluator object.

(returnValue, partialU, partialV) = surfaceEvaluator_var.getFirstDerivative(parameter)
 

#include <Core/Geometry/SurfaceEvaluator.h

// Declare the output arguments.
Ptr<Point2D> parameter;
Ptr<Vector3D> partialU;
Ptr<Vector3D> partialV;
boolean returnValue = surfaceEvaluator_var->getFirstDerivative(parameter, partialU, partialV);

Return Value

Type Description
boolean Returns true if the first derivative was successfully returned.

Parameters

Name Type Description
parameter Point2D The parameter positions to get the surface first derivative at. The parameter position must be within the range of the parameter extents as verified by isParameterOnFace.
partialU Vector3D The output first derivative U partial vector at the parameter position specified.
partialV Vector3D The output first derivative V partial vector at the parameter position specified.

Version

Introduced in version August 2014