Hi @checcosisani​ I don't see any picture, but if I'm imagining this correctly you can get the angles of each line at a node if you 'Generate List From Input Edges' on the Nodes in the TopologyBuilder. The list attributes will be sorted by angle, increasing counter-clockwise from East. The angle between lines (first segments from the node) can be calculated something like this: (@Value(edges{1}.fme_arc_angle) - @Value(edges{0}.fme_arc_angle) )