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Table of contents
No headersNote: you must have Python installed to use the Python script node. See Installation and Getting Started.
Goal: Learn how to pass lists and data structures into the Python scripting node. Connect the dots between to sub-divided curves by passing in two collections of points and having a Python script create new line between each pair of points.
- From Vasari 2.5, Click
> (Open). - Navigate to C:\VasariWIP\2-5\Dynamo\Samples Open Mass with 2 Curves.rfa from theSamples directory.
- Go to Add-ins tab and launch Dynamo
- From the Dynamo File Menu, go to File/Samples/ 7. Connect Two Point Arrays. You should see this workspace appear:
Using a python script to make lines between two collections of points
- Select the curves using the Curve By Selection Nodes in Dynamo
- Press Run. You should see a set of lines created between the points
So what is happening here? Dynamo nodes are creating two collections of points, one list per selected curve. The List node then takes those two lists and creates a new list around them, a list of lists. This List is then passed into the IN port in the Python node. The python script then unpacks the lists and iterates through the elements to create new lines. A line is created between pairs of points. Here is the Python script:
| import math
doc = __revit__.ActiveUIDocument.Document app = __revit__.Application
RefPointList1 = IN[0] RefPointList2 = IN[1] count = IN[2]
max = int(count)
#use for loop to connect two series of points #if count > len(RefPointList1): max = len(RefPointList1)
for i in range(0,max): pt1 = RefPointList1[i] pt2 = RefPointList2[i] refptarr = ReferencePointArray() refptarr.Append(pt1) refptarr.Append(pt2) crv = doc.FamilyCreate.NewCurveByPoints(refptarr)
|
Python script to connect two lists of points
Comments6
- Is it possible to connect points from two arrays in dynamo without python? I know the new divide and repeat does this in Revit 2013, but how to accomplish this in Dynamo?
- Yes it is possible. First you want to use the combine node to combine a point from each list into its own list, then you want to use the map node to pass each of these new 2-element lists into the Curve By Points node.
In depth:
1) Remove the list node and the python node (right-click -> delete)
2) Add a combine node and a list node. Connect the lists of references points to listA and listB of the combine node. Adjust the list node so that it takes two inputs. Connect the list node to the f(A, B) input of the combine node, but do not connect anything to the inputs of the list node.
3) Add a map node and a Curve By Points node. Connect the output of combine to the seq input of the map node. Connect the output of the Curve By Points node to the f(x) input of the map node. Do not connect anything to the input of the Curve By Points node.
Stephen Elliott
Autodesk - Cool, thanks for the quick response!
- I have been followed all your steps but while I began to pick up curves I recived a program crashing,and it is not been ran yet, I am in RAC 2012 not Vasari,is it mattered?
- Yes, this is a known bug at the moment. Make sure you are not placing any more curves in RAC (hit ESC a few times after placing new curves) and then try clicking the "Select" button on the "Dynamo Curve By Selection" nodes.
- Thank u very much for the help!
