射线法求交是很多三维模型求碰撞和测量间距最常用的节点,但是再使用射线法将target
设置为element
的时候会发现会出现两个相同的值。
下面用楼板距离,下图中会出现两个不同的值,在我修改板厚之后发现正好是板厚的距离,可以猜测射线法会对两个face进行判定相交,但是与我们需要的每个element输出一个值不符,这里需要重新做一次判定或者直接取最小值获得净高。
var intersector = new ReferenceIntersector(classFilter, FindReferenceTarget.Element, modelView);
intersector.FindReferencesInRevitLinks = true;
var result = intersector.Find(origin, -XYZ.BasisZ);
foreach (var context in result)
{
var ele = context.GetReference();
var revitLinkInstance = _document.GetElement(ele) as RevitLinkInstance;
var linkDoc = revitLinkInstance.GetLinkDocument();
var eleName = linkDoc.GetElement(ele.LinkedElementId);
var eleNmae = _document.GetElement(ele).Name;
MessageBox.Show(result.Count.ToString() + "-" + eleNmae + $"{eleName.GetType()}" + "-" + context.Proximity * 304.8);
}
后面我将方法改为获取最近的面才避免这种情况发生,但是碰到其他情况,可能需要循环一下context
的值进行重新筛选
var result = intersector.FindNearest(origin, -XYZ.BasisZ);
var stringbuild = new StringBuilder();
var ele = result.GetReference();
var revitLinkInstance = _document.GetElement(ele) as RevitLinkInstance;
var linkDoc = revitLinkInstance?.GetLinkDocument();
var eleName = linkDoc?.GetElement(ele.LinkedElementId);
stringbuild.Append(
$"ElementType : {eleName?.GetType()} , ElementLinkId:{ele.LinkedElementId} ,Proximity : {result.Proximity * 304.8} \r\n");
MessageBox.Show(stringbuild.ToString());