How Can I make 3D Roads?

Questions & Answers
1

So the title kind of explains it, I need to make 3D roads similar to Unturned’s road system
how do I accomplish this?

I should probably note that it will need to go across the terrain too, so it has to be able to manipulate itself to the terrain and look natural, I have a 3D model for the road but I just need to be able to place it via nodes and the need to connect to each other.

Thanks in advance!

Also sorry for asking a lot of questions lately, I don’t know if that bothers some people or not but I just recently found out that I was supposed to leave my questions in “Default” and they get answered now so I can finally get some assistance on all of the problems I’ve been having, most have been resolved thanks to you guys!

2

What you want to do isn’t trivial but it looks like that road system you linked creates a procedural mesh by connecting quads between given waypoints. If that’s what you’re after then you’ll need to start by creating a single quad procedurally and then expanding by increasing the number of vertices for each road section. Here’s the bare-bones of how to create a grid of quads procedurally:

public void CreateMesh(int size)
 {
     List<Vector3> verts = new List<Vector3>(); // Index used in tri list
     List<int> tris = new List<int>(); // Every 3 ints represents a triangle
     List<Vector2> uvs = new List<Vector2>(); // Vertex in 0-1 UV space
     for (int i = 0; i < size; i++)
     {
         for (int j = 0; j < size; j++)
         {
             verts.Add(new Vector3(i, 0, j));
             uvs.Add(new Vector2((float)i / size, (float)j / size));
             if (i == 0 || j == 0) continue; // First bottom and left skipped
             tris.Add(size * i + j); //Top right
             tris.Add(size * i + (j - 1)); //Bottom right
             tris.Add(size * (i - 1) + (j - 1)); //Bottom left - First triangle
             tris.Add(size * (i - 1) + (j - 1)); //Bottom left 
             tris.Add(size * (i - 1) + j); //Top left
             tris.Add(size * i + j); //Top right - Second triangle
         }
     }
     Mesh mesh = new Mesh();
     mesh.vertices = verts.ToArray();
     mesh.uv = uvs.ToArray();
     mesh.triangles = tris.ToArray();
     mesh.RecalculateNormals();
     
     GameObject grid = new GameObject("Grid");
     grid.AddComponent<MeshFilter>();
     grid.AddComponent<MeshRenderer>();
     grid.GetComponent<MeshFilter>().mesh = mesh;
     // Load a material named "GridMat" from a folder named "Resources"
     MaterialgridMat = Resources.Load<Material>("GridMat");
     grid.GetComponent<Renderer>().material = gridMat;
 }

That should be enough to get you started, but you’ll have to adjust it to be a “grid” with one base square and x waypoints for height along with the custom positions from the waypoints. As for connecting the roads… that’s a whole other beast entirely and one you might want to focus on once you have roads in place.