Morning all,
I’m trying to get grids intersection with multi-segments and arcs. I simply used Geometry.Intersect but Revit is also giving me an intersection at the corner of each segment.
Any idea how to filter them out smartly?
I thought of using X/Y coordinates to rule them out but I’m not sure it’s a great idea
Hi Daniel,
Could you drop screenshot or files so that we can identify your issue. Thanks 
what about using the grid identifier? if the intersection of the elements has the same grid number/letter it gets filtered out
H’ere’s what im looking at right now.
Greg, im filtering points, so thers no more “attachment” to the Grids aymore
Okay! A screenshot clarifies a lot. I would have used SetDifference to remove the start and end points from the list of intersection points. It removes all common elements in the two list.
I like the idea Einar but SetDIfferences returns an integer not a list of Points
Not if both lists only contain points… Did you use the RemoveIfNot filter?
multigridInteresection.dyn (8.6 KB)
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Something is wring because it’s returning 24 items (seems like i have double values if you look at the labels) when i should have 15. I placed Structural Columns to make sure 
BTW i just removed the node and placed it back
Ok, if i try List.UniqueItems it won’t get rid of the points (which have the EXACT same values) but Point.PruneDuplicates will do
So your problem is solved then?
Yes and Colin will write a post about why this is happening… very interesting explanation
Thanks for your help