Spatial Constraint customization in Node level (for detecting corners, edges, etc)
watch?v=AMv7rFT6C1M
I poured through the engine code and got this detail customization finally working 
A builder can define constraints (and corresponding UI) in the node level and work on those constraints for selecting the nodes
The default Grid based builder defines 3 constraint configuration
3x3 - useful for floor constraints
2x2 - useful for pillar constraint
Edge - useful for wall constraints
Each cell can have one of the 3 states:
- Occupied
- Empty
- Don’t Care
This way you can selectively add nodes that are designed for corners, edges. T-junctions, X-junctions, Single-lane corridors etc
I didn’t implement the logic yet. Will have more tomorrow