Hi all - I have a couple of instances of list configurations that I was hoping I could run by you clever lot.
One of them I solved myself using Python but wanted to see if there was a more succinct way that I could have done it or by using Dynamo nodes as I was struggling!
The other is unresolved and I’m pretty certain it is a levels issue but I’ve tried all of the combinations that make sense to me to little avail.
I’ll start with the latter:
I need to do a list replace with the following.
The curves coming out of the Curve.ExtendEnd need to replace the lines in the Orange groups at the specified indices coming out of the List.IndexOf.
I need the curve at index 0 in list 0 to replace the line at index 1 in list 0 of the slab perimeter curves. I then need the curve at index 1 of list 0 to replace the line at index 3 in list 0 of the slab perimeter curves.
Then to move on to the next list and do the same in the same structure.
I am having issues doing this and do not know if I need to chop my lists or if I just need to adjust the levels. Any ideas?
The second list issue that I have solved using Python is the following.
Given a list of sublists that contains the bounding box extents of all walls grouped by level, to do an intersection test with every item in a similar list of sublists. But, rather than bounding boxes of walls, it is an intersection test with bounding boxes of cavity barriers placed on the level above.
An intersection test is done between each cavity barrier and every wall on the level below the cavity barrier. If any of the wall bounding boxes intersects a cavity barrier bounding box, the relative wall is to be appended to a list. Once all the walls at the level have been checked against the first cavity barrier in the sublist, all of the walls in the temporary list are appended to a higher-order list and the next cavity barrier in the list is checked against all the walls again.
Once all the cavity barriers from the first level have been checked, the script moves onto the next sublist which represents the cavity barriers on the level above and the process is repeated.
These lists are passed on to the Cut Geometry node which is why I need like for like wall and cutting element (cavity barrier) lists.
The end result does and should look like this:
The input lists look like this:
The code is here:
import clr clr.AddReference('ProtoGeometry') from Autodesk.DesignScript.Geometry import * clr.AddReference('DSCoreNodes') from DSCore import * BB_cavity_barriers = IN # Bounding boxes of all cavity barriers grouped_cavBs = IN # Cavity barriers in lists /grouped by level grouped_walls = IN # Walls in lists /grouped by level BB_walls = IN # Bounding boxes of all walls #Function that, given bounding boxes of walls & cavity barriers, will check which cav B's #are in which walls and group them accordingly. A corresponding list of cavity barriers #with the same list structure is also created so that the cutting node in Dynamo #has a like for like host / cutting element. def intersection_test (BB_cavity_barrier_set, BB_wall_set, wall_set, CB_set): sorted_walls =  # List for walls once grouped sorted_CavBs =  # List for cavity barriers once grouped for i, barrier in enumerate(BB_cavity_barrier_set): # for each barrier # intermediate list required so if multiple walls intersect 1 CB they are appended as a group intermediate_wall_list =  intermediate_CB_list =  for index, wall in enumerate(BB_wall_set): # for each wall against each barrier if BoundingBox.Intersects(barrier, wall): # check intersection intermediate_wall_list.append(wall_set[index]) # if intersects append to the intermediate list #once each wall in the set has been checked against the 1 CB the intersecting walls are appended to the sorted list as a group. sorted_walls.append(intermediate_wall_list) #if more than 1 wall intersects the CB then the CB is cycled by the number of repititions required to create the like for like list. if len(intermediate_wall_list)>1: sorted_CavBs.append([CB_set[i]]*len(intermediate_wall_list)) else: sorted_CavBs.append([CB_set[i]]) # if just 1 intersection then only 1 CB appended return sorted_walls, sorted_CavBs grouped_by_cavB_walls =  #empty list for index, wall_group in enumerate(grouped_walls): #run the function on the elements level by level and append the results grouped_by_cavB_walls.append(intersection_test(BB_cavity_barriers[index], BB_walls[index], wall_group, grouped_cavBs[index])) OUT = grouped_by_cavB_walls
I would appreciate any help anyone can give on either of these (the one I haven’t yet solved is; unsurprisingly, the more important of the two.