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I continued the dialogue within the place and wall adjacency with Massimiliano Revelli of Informatica System srl, simply because he is in fact interested in identifying the wall area adjacent to your room, and not just the overlapping curve section duration.

The overlapping location is naturally easy to decide if your wall includes a frequent height, as I pointed out inside the before post, but this is typically not the situation. As an example, allow us have a look at the higher wall on this flooring prepare of a basic instance demonstrating the issues, highlighted in red:

The 3D view of the highlighted wall looks like this:

The wall geometry and also the stable it provides is just not subdivided on the point wherever it intersects the interior wall,Office 2007 Professional Plus Key, as we will see through the triangles displayed through the component viewer SDK sample:

To decide the precise adjacent place, we need to determine the internal experience of your wall and decide which a part of it overlaps the room boundary segments. We will take advantage of the options regarding how to establish the interior experience from the wall and its area from prior discussions.
Here are 3 various suggestions concerning how to tactic the problem:
Put into action an algorithm that calculates the area of the portion of a vertical triangle that overlaps a horizontal line section. When determining the wall polygons, truncate them to return only those elements overlapping the horizontal room boundary segments. Use the room's ClosedShell home and calculate its intersection area using the wall faces.
Here are somewhat much more comprehensive descriptions of each approach:

One tactic to solve our existing dilemma can be to put into action an algorithm that tasks the space boundary curve segments onto the wall deal with triangles and determines the place of the overlap.

Another method may commence a bit previously, modifying the utility techniques in the module CmdWallProfile.cs, from the strategy GetWallProfilePolygons, for example by modifying the GetProfile strategy to challenge its polygons onto the wall location curve, after which chop of the areas that lie outside the place boundary curve section. The advantage of this is that our polygon area calculation algorithm may be left unchanged, since it previously handles all types of polygons, and it is not constrained to triangles.

A third, completely various strategy could take advantage of the Area object's ClosedShell residence. ClosedShell returns a geometry aspect, that's a stable, which within this particular sample model can be a quadrilateral with six faces and twelve edges. We could determine the overlap of the closed shell faces together with the wall faces, which will give us the adjacent surface.
The very good issue regarding the latter method is that a part of the necessary evaluation has currently been implemented,Windows 7 Key, in the SDK sample RoofsRooms. It includes a module GeomUtil.cs which implements a technique AreSolidsCut. This technique analyses regardless of whether any one room strong experience can be a subset of any roof stable encounter,Office Standard, during which situation it returns accurate. In the RoofsRooms sample, this approach is utilised to determine which roof element is covering which place. In our scenario, we'd should develop this approach to not just return correct if an overlap is discovered, but truly calculate the overlapping area. For that moment, this is left being an physical exercise for the reader. Submissions of functioning remedies are gladly accepted.

To put into action a generic remedy for calculating the region of two overlapping polygons, we want a 2D Boolean operation to determine the intersection of two polygons. Unfortunately, the Revit API does not supply this sort of a Boolean operation out of the box.

One might perhaps be able to use the a number of the performance provided by different AutoCAD APIs such as AModeler or areas, by operating AutoCAD from the background and calling a helper software. Of course, this requires AutoCAD to become put in on the very same machine as your Revit software, which can be not often desirable.

Another and probably easier option could be to make use of a free-standing Boolean operation library for polygons. There are a variety of them out there,Microsoft Office 2007 Professional Plus, when you can see by googling for "polygon boolean" or by looking at the Wikipedia post on Boolean operations on polygons. We have downloaded the Generic Polygon Clipper (gpc) as well as the C# wrapper GpcWrapper for it, and that appears promising. Please allow me to know in case you already have any encounter producing use of this or any other Boolean libraries inside of Revit.