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IArcSpline3DCurve Interface
IArcSpline3DCurve Interface
- GetSplineNormals
- GetCurvatureArray
- GetSpline
- MakeSmoothModifyCurvatures
- MakeSmoothAlternating
IArcSpline3DCurve gives programmatic access to
Arc Spline Curves. Objects implementing this interface also implement ICurveFreeForm
See also Pipes sample, Interface List
HRESULT GetSplineNormals(IArray3D** normals)
Parameters
normals - [out, retval] The retuned array of
spline
normals. i-th element in the array in a normal vector of plane of
i-th
spline.
- Remarks:
Returns array of
spline
normals. i-th element in the array in a normal vector of plane of i-th
spline.
HRESULT GetCurvatureArray(IArrayNum** curvatures)
Parameters
curvatures - [out, retval] array of curvatures
one per spline
- Remarks:
The method returns array of double numbers one per spline in the curve. The i-th
number is curvature of i-th
spline arc. IArrayNum.Set will fail with DISP_E_PARAMNOTOPTIONAL
return if the curvature is too high and the arc would become invalid
(geometrically impossible).
HRESULT GetSpline(int index, IArc** iArc)
Parameters
index - [in] Index of the spline to be retrieved
- Remarks:
Use this method to access more advanced properties of an individual spline in
the curve.
HRESULT MakeSmoothModifyCurvatures()
Modifies
spline
normals and curvatures to make the whole curve smoothely interpolating the input points
HRESULT MakeSmoothAlternating(double curvature)
Assumes that on start the points data is already defined (see ICurveFreeForm) and the first section is straight. Modifies
spline
normals of every second section and sets its curvature to curvature so that the resulting curve is smooth. Points are also shifted along the previous straight section to make this possible. In case when two consequtive straight sections do not belong to a single plane an additional point is inserted and a two-arc spline is constructed to smoothely connect the straight sections
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