Analyze curves to create surface and get area by shared curves

Revit
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1

Dear Members,

I am stuck. How can I generate an surface out of lines (curves) if both surfaces share one line?

Thanks a lot!

pr_area0
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2

Try using after PolyCurve.ByJoinedCurves the node Surface.ByPatch

3

Thank you for your prompt reply. I’ve already tried your approach - with the same result :frowning:

4

How are you getting your elements? What are they?

5

At the moment just a model line out of revit. In the future I want to analyze a DWG/DXF Layer for surfaces and areas. (With the CAD.CurvesFromCADLayers node)

Maybe the next challenge is to group or order the curves by it’s geometry, not by “creation order”

6

Perhaps try a mesh.

7

1
1.PNG1612×946 417 KB

One primitive method is to select every 3 curves with one ‘Select Model Elements’ , and then to join in a polycurve all in each of the group

8

Sure, you are absolutely right. But at more than 100 or 1000 Elements it will be a lot of work that is not automated. That is not the goal.

9

in which way? It would give me just points, or am I missing something?

10

Hi @Kiwi

Could you share rvt file here? Use dropbox/google drive if you’re unable to attach rvt here.

11

https://www.dropbox.com/s/6l5i4ozjc626ww9/rvt_001.rvt?dl=0

12

sounds to me like you want to analyze topology. I think there are some packages that do this very well… but DynamoUnfold has some classes to do it.

1 Like
13

@Kiwi Try this for kiwi.dyn (28.7 KB)

1 Like
14

@Kiwi The Design Script below should do the needful. Though it might need fine tuning.
If you prefer nodes, you could use this as a reference to do so.

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//Coordinate values need to be rounded in this case
sp = Point.ByCoordinates(Math.Round(lns.StartPoint.X,3),
Math.Round(lns.StartPoint.Y,3),Math.Round(lns.StartPoint.Z,3));
ep = Point.ByCoordinates(Math.Round(lns.EndPoint.X,3),
Math.Round(lns.EndPoint.Y,3),Math.Round(lns.EndPoint.Z,3));

//All Vertices (Start and End Points of Lines)
a = Point.PruneDuplicates(List.Flatten([sp,ep],-1));

//Index of Start and End Points in list of Vertices
b = List.Transpose([List.IndexOf(a,sp),List.IndexOf(a,ep)]);
c = List.Flatten(List.Permutations(b,3)<1>,-1);

//Obtain indices of connected vertices
d = List.GetItemAtIndex(c<2>,(0..5)<1>);
e1 = d[0]==d[5] && d[1]==d[2] && d[3]==d[4];
e2 = d[1]==d[5] && d[0]==d[2] && d[3]==d[4];
f = List.UniqueItems(List.FilterByBoolMask(c,e1 || e2)["in"]<1>);
g = List.UniqueItems(List.Sort(f));
h = List.GetItemAtIndex(a,g);

//Surfaces
srf = Surface.ByPerimeterPoints(h);
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15

Thanks Michael, Kulkul & Vikram for your time and great ideas. This is really helpful and - yes, for sure - it needs some fine tuning.

@Michael_Kirschner2 Didn’t have invest time yet to get into that right now. But i will go ahead with that topic later. I’m a “noob” in coding with i.e. Python. This will be my next big step.

@Kulkul This procedure needs to interact with the List and much more. I want to build a “one click” analyzing tool for GIS floors.

@Vikram_Subbaiah Your script works pretty well with triangular surfaces with only 3 points. But i cant get to work it with for example circles/hexa/ or even triangles with 4 lines instead of 3.?! - I guess it needs some modification for every case and at the end bring alls Surfaces together in one list?

Some modifications in rvt:

thx_kulkul
thx_kulkul.jpg3688×1134 1.13 MB

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1 Like