topic Re: Extracting co-ordinates from geometry of room or any other structure in Revit API Forum

Extracting co-ordinates from geometry of room or any other structure

Anonymous — Tue, 31 Mar 2015 13:47:23 GMT

Hi,

I am a newbie in using C# and Revit API programming for creating plugins.

I am trying to retrieve co-ordinates of any structure. Let's say, for a room with four walls, I need to retrieve the co-ordinates of the four corners and write them to a text file.

I have used a wall filter to extract the elements and then applied get_Geometry() method on each element.

This approach gives me a lot of duplicate co-ordinates.

I have tried the same way for using different filters for roofs, floors, doors and windows.

I don't know for sure whether I am correct or not.

Please let me know if this a correct way of extracting the co-ordinates of any structure.

If there is a better and more correct method to do it, please let me know.

Re: Extracting co-ordinates from geometry of room or any other structure

jeremytammik — Tue, 07 Apr 2015 09:30:36 GMT

Your approach sounds fine to me.

Duplicate corrdinates are to be expected, of course.

You can eliminate them in many ways.

The easiest, I find, is to implement a fuzzy point equality comparer and then add the points as keys to a dictionary.

I think I do that in my concrete setout point add-in:

http://thebuildingcoder.typepad.com/blog/2014/11/concrete-setout-points-for-revit-structure-2015.html

I also demonstrate this approach in many other samples on The Building Coder.

Search for XyzEqualityComparer, for instance.

Cheers,

Jeremy

Re: Extracting co-ordinates from geometry of room or any other structure

Anonymous — Wed, 08 Apr 2015 17:58:41 GMT

Thank you Jeremy.

I will look into the code for the removal of the duplicate points.

@Anonymous wrote:
Your approach sounds fine to me.

Duplicate corrdinates are to be expected, of course.

You can eliminate them in many ways.

The easiest, I find, is to implement a fuzzy point equality comparer and then add the points as keys to a dictionary.

I think I do that in my concrete setout point add-in:

http://thebuildingcoder.typepad.com/blog/2014/11/concrete-setout-points-for-revit-structure-2015.html

I also demonstrate this approach in many other samples on The Building Coder.

Search for XyzEqualityComparer, for instance.

Cheers,

Jeremy