I am having real difficulty in identifying an intersection point of a wall and a duct. I have read many post on this and none of them seam to offer a solution, can any one help. The attached image shows the script and as you will see I have the solid walls and the duct locations but the Geometry Intersect Node shows ‘empty list’ and Geometry DoesIntersect shows false even though the ducts clearly pass through the wall. I am new to Dynamo and fear I may be making a school boy error. Any help would be greatly appreciated.