Unity Terrain Under Mesh Road Helper

Helper to raise terrain under a chosen mesh—e.g., for integrating roads into your terrain.

Dependencies

• Unity Version: Tested with Unity 6.3 LTS
• Packages Needed: Splines Package from Unity Registry

Usage

1. Create a terrain in your scene.
2. Create a spline along your terrain.
3. Add Spline Extrude Component to the spline object to create a road.
   • Set Shape Extrude Type to "Road" (or any desired type).
   • Select your desired radius.
4. Add Mesh Collider Component to the spline object.
   Do NOT skip this step!
5. Add the TerrainDeformer script to your terrain object.
6. Assign your spline object to the Road Mesh Object field in the script inspector.
7. (Optional, pt. 1) Increase spline radius by 10–20% for better results (you can revert this later).
8. Open the context menu and select Project Mesh to Terrain.
   ⚠️ Warning: This step is destructive and non-reversible!
9. (Optional, pt. 2) Revert the radius back to its original value. ⚠️ Warning: This step is destructive and non-reversible!
10. (Optional, pt. 2) Revert the radius back to its original value.