Broken 2-Layer autoroute

[leommxj]

Hi,
Any 2-layer autoroute stop at initialize_graph(report ValueError("No edges")), even though the README lists 2-layer examples (CSEduino v4, RP2040 Minimal).

I believe the problem was introduced during some performance optimization.
52bbb05
a94c090

OrthoRoute/orthoroute/algorithms/manhattan/unified_pathfinder.py

Line 957 in a94c090

routing_layers = list(range(1, layer_count - 1))

and

OrthoRoute/orthoroute/algorithms/manhattan/unified_pathfinder.py

Line 932 in 52bbb05

for z in range(1, self.layers - 1):

This will result in direct rejection of 2-layer board wiring.

But even if this issue is fixed, other problems still affect the routing of 2-layer boards, such as the portal planner optimization. 😧