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Hi, For a tool I've been working on, I need to have a way of finding adjacent faces between the inside of fractured pieces. I want to store this as a primitive attribute, that gives the number of the adjacent primitive. The way I have done it is by calculating the centroid of each primitive (using getbbox_center) and then iterating through the primitives in a for-each loop, finding the other primitive with the same centroid. (it turned out that the centroids were different by a tiny amount, so I introduced an accuracy value that you can set, and it finds the adjacent primitive within that distance). It then stores this as a primitive attribute. All seems to be working fine on simple fractures, but as soon as you sent the number of fractures higher than 22, it seems to bug out and all the adjacent faces are incorrect. I have visualized this in the HIP file by having a subnet that draws lines between adjacent faces. Attached is my HIP file. If anyone has any idea what could be causing this issue, I would be very grateful! I have also noticed that it seems to be a bit slow to calculate the adjacent faces, so if anyone knows a more efficient way of doing this, I'd also be pleased to hear it. Best, Stephen FindingAdjacentFace.hipnc