// TODO: this script should be caching as much data as possible - we can add and remove a single row
// from the mesh at a time. We can probably do something with the meshes to make them triangle
// strips from the get-go, rather than relying on Unity to do it. One option is to use multiple game objects
// with this script attached.
void UpdateTerrainMesh(GridMesh gridMesh)
{
// Calculate the number of terrain units the grid has shifted along the x-z plane
IPoint dp = new IPoint((int)(transform.position.x - oldPosition.x), (int)(transform.position.z - oldPosition.z));
gridMesh.Shift(dp);
}