Revit开发之射线法ReferenceIntersector

Revit开发里有一个ReferenceIntersector 类，

通过这个类可以找到某一条射线方向上的所有

Element的Reference

这个类有四种构造函数

	Name	Description
	ReferenceIntersector(View3D)	Constructs a ReferenceIntersector which is set to return intersections from all elements and representing all reference target types.
	ReferenceIntersector(ElementFilter, FindReferenceTarget, View3D)	Constructs a ReferenceIntersector which is set to return intersections from any element which passes an input filter.
	ReferenceIntersector(ElementId, FindReferenceTarget, View3D)	Constructs a ReferenceIntersector which is set to return intersections from a single target element only.
	ReferenceIntersector(ICollection<(Of <<'(ElementId>)>>), FindReferenceTarget, View3D)	Constructs a ReferenceIntersector which is set to return intersections from any of a set of target elements.

无论哪一种都是需要一个3D视图

ElementFilter是查找的过滤条件

也可以通过ElementId 和Icollection 来直接设置查找对象

还可以通过

FindReferenceTarget

来设置目标类型

查找的时候需要调用Find 函数，它需要传入一个点和一个方向来确定一个射线

这个函数会返回一个

IList

这里包含了说有找到的Reference

下面是一个用射线法找到和管道相交的墙的例子

            XYZ p1 = pline.GetEndPoint(0);
            XYZ p2 = pline.GetEndPoint(1);


            XYZ dir = (p2 - p1).Normalize();
            double length = pline.Length;


            ElementClassFilter wallFilter = new ElementClassFilter(typeof(Wall));




            ReferenceIntersector rinter = new ReferenceIntersector(wallFilter,FindReferenceTarget.Element,v);


            IList rwc = rinter.Find(p1, dir);
            int i = 0;
            foreach (ReferenceWithContext r in rwc)
            {
                if (r.Proximity < length)
                    i++;
            }


            TaskDialog.Show("info", "墙的数量为：" + i.ToString());

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