How to join and dissalow join different elements

[Nico_Stegeman]

See also following topic:

Auto join Elements

@Johannes_Meiners the nodes are great. But i am not really sure how they work. For example: the element.intersectelement. I use it to compare the elements and afterwards look if they are already joined, but then they wont join. [2018-02-01%2008_11_18-Dynamo] and sadly the new nodes wont solve the “already joined” problem. Am i even on the right way? Regards, Ammo