使用revit api画垂直于风管的风管示例

        Transaction ts = new Transaction(doc, "http://www.weikejianghu.com");
        ts.Start();
        //得到一种风管类型
        DuctType ductType = null;
        FilteredElementCollector collector = new FilteredElementCollector(doc);
        collector.OfClass(typeof(DuctType));
        foreach (Element el in collector.ToElements())
        {
            ductType = el as DuctType;
            break;
        }
        //
        Reference refDuct = selection.PickObject(ObjectType.Element, "选择一根风管：");
        Duct duct = doc.GetElement(refDuct) as Duct;
        XYZ xyz = selection.PickPoint();//选择一点
        LocationCurve lCurve = duct.Location as LocationCurve;
        IntersectionResult interResult = lCurve.Curve.Project(xyz);//点在直线上的投影
        if (interResult != null)
        {
            doc.Create.NewDuct(xyz, interResult.XYZPoint, ductType);
        }
        ts.Commit();
        return Result.Succeeded;
    }
}
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