【C# ORD】沿路径扫描生成Surface不成功

Question

我用C#\C++混合编程，调用mdlBspline_surfaceFromRailsAndSweptSections (pSurface, pRail1, pRail2, pSection1, pSection2, numSections, skinTolerance, skinDirection, bSectionRotate, bSectionRotationAxisFromRail0, bSectionOrthogonality, bSectionScale, bSectionScaleUniformly)。 
 对于曲线我都有memset(&section1, 0, sizeof(section1))，并且尝试各种参数组合，获得的Surface Element都是无效的， 
 请问 mdlBspline_surfaceFromRailsAndSweptSections 这个函数应该怎么使用？ 
 代码如下： 
 DgnModel dgnModel = Session.Instance.GetActiveDgnModel();
 long id1 = 982;
 Element rail1 = dgnModel.FindElementById((ElementId)id1);
 long id2 = 984;
 Element rail2 = dgnModel.FindElementById((ElementId)id2);
 long id3 = 1051;
 Element section1 = dgnModel.FindElementById((ElementId)id3);
 long id4 = 1053;
 Element section2 = dgnModel.FindElementById((ElementId)id4);

 Element surfaceEle = OrdSurfaceHelper.CreateSplineSurfaceBySweepTwoCurves(rail1, rail2, section1, section2
 , 2, 0.001, 0, false, false, false, true, true); 
 static BDE::Element^ CreateSplineSurfaceBySweepTwoCurves
 (
 BDE::Element^ pRail1,
 BDE::Element^ pRail2,
 BDE::Element^ pSection1,
 BDE::Element^ pSection2,
 int numSections,
 double skinTolerance,
 int skinDirection,
 bool bSectionRotate,
 bool bSectionRotationAxisFromRail0,
 bool bSectionOrthogonality,
 bool bSectionScale,
 bool bSectionScaleUniformly
 ); 
 文件如下： 
 扫略试验.dgn

Yongan.Fu · Accepted Answer

该函数为一个未公开的C函数，请先在纯C/C++环境下调用成功后再在混合环境下调用，这样可以排除你混合编程造成的问题。以前郭老师曾经写过一个调用成功的例子如下： 
 extern "C" StatusInt mdlBspline_surfaceFromRailsAndSweptSections
(
	MSBsplineSurface* pSurface,
	const MSBsplineCurve* pRail0,
	const MSBsplineCurve* pRail1,
	const MSBsplineCurve* pSection0,
	const MSBsplineCurve* pSection1,
	int numSections,
	double skinTolerance,
	int skinDirection,
	BoolInt bSectionRotate,
	BoolInt bSectionRotationAxisFromRail0,
	BoolInt bSectionOrthogonality,
	BoolInt bSectionScale,
	BoolInt bSectionScaleUniformly
);

void TestSweepTwoAlongOne()
{
	MSBsplineSurface msBspSurface;
	memset(&msBspSurface, 0, sizeof(msBspSurface));
	EditElementHandle eehPath(7156, ACTIVEMODEL);
	EditElementHandle eehProfile1(7155, ACTIVEMODEL);
	EditElementHandle eehProfile2(7158, ACTIVEMODEL);
	CurveVectorPtr cvevcrPtr = ICurvePathQuery::ElementToCurveVector(eehPath);
	MSBsplineCurvePtr msBspCvePtrPath = cvevcrPtr->GetBsplineCurve();
	cvevcrPtr = ICurvePathQuery::ElementToCurveVector(eehProfile1);
	MSBsplineCurvePtr msBspCvePtrPro1 = cvevcrPtr->GetBsplineCurve();
	cvevcrPtr = ICurvePathQuery::ElementToCurveVector(eehProfile2);
	MSBsplineCurvePtr msBspCvePtrPro2 = cvevcrPtr->GetBsplineCurve();
	if (SUCCESS != mdlBspline_surfaceFromRailsAndSweptSections(&msBspSurface, &*msBspCvePtrPath, NULL,
 &*msBspCvePtrPro1, &*msBspCvePtrPro2, 2, 0, BSSURF_U / BSSURF_V, FALSE, TRUE, TRUE, TRUE, TRUE))
	{
 return;
	}
	EditElementHandle eehResult;
	DraftingElementSchema::ToElement(eehResult, msBspSurface, NULL, *ACTIVEMODEL);
	eehResult.AddToModel();
}

【C# ORD】沿路径扫描生成Surface不成功

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