EasyRoadsVertexPath

Here are scripts to build vertex paths for EasyRoads3d spline road paths, including sample scripts to implement path following.

EasyRoads3D: https://assetstore.unity.com/packages/tools/terrain/easyroads3d-pro-v3-469

Inspired by API of Bezier Path Creator: https://assetstore.unity.com/packages/tools/utilities/b-zier-path-creator-136082

How to use

1. Add ERNetworkVertexPathCreator to ER Road Network It will add (if not exists) ERNetworkVertexPathCreator and ERPathAdapter to any ERModularRoad from children. ERNetworkVertexPathCreator will create vertex path based on ER spline path with given angleThreshold and scanStep ERPathAdapter will provide API to align objects along the path and calculate nearest position and distance.
2. Add ERPathCamera (sample script) to any Camera to follow given road path (link modularRoad to any ERModularRoad)
   Input:
   • ERModularRoad - road to follow (will search for ERPathAdapter component and use it)
   • SpeedMs - velocity in meters per second
3. Add DummyHelperPathController (another sample script) to any object to move it along the path Input: ERModularRoad - road object to follow speedMs - move velocity in m/s positionByClosestPoint - position object by closest point or by closest distance alignToPath - enable/disable path following (useful to check path alignment for objects out of path in different configs)

Description of sample scene

Lets review sample config - it will contain single ER Road Network with Road, Camera to move along the Road and two GameObjects which will also move along road path.

Required config steps are described by following screenshots

1. Add ERNetworkVertexPathCreator to Road Network

2. Add ERPathCamera to Camera and link it to ERModularRoad

3. Configure ByPosition path follower

4. Configure ByDistance path follower

Vertex paths gizmos are shown in Play mode:

Scripts

1. ERNetworkVertexPathCreator - scan Road Network for roads, attach ERPathToVertexPathWrapper and ERPathAdapter to each road (if not exists)
2. ERPathToVertexPathWrapper - builds vertex path from ER spline path for given road (by default with angleThreshold and scanStep set for ERNetworkVertexPathCreator). If angleThreshold or scanStep must be customized, ERNetworkVertexPathCreator can be manually attached to the road
3. ERPathAdapter - provide API to follow vertex path

API methods of ERPathAdapter

• Vector3 GetPointAtDistance(float distance)
• Quaternion GetRotationAtDistance(float distance)
• Vector3 GetDirectionAtDistance(float distance)
• float GetClosestDistanceAlongPath(Vector3 p)
• Vector3 GetClosestPointOnPath(Vector3 p, out float closestDistance)
• Vector3 GetClosestPointOnPath(Vector3 p)

Notes:

• I'm not using crossings, therefore linked roads are not supported
• All methods distance-related methods are map distance to current road bounds (from zero to total path distance) so you can use negative distance or distance much more than total road length