/// <summary>
/// Procedurally generate an object from the data given in the OsmWay instance.
/// </summary>
/// <param name="way">OsmWay instance</param>
/// <param name="mat">Material to apply to the instance</param>
/// <param name="objectName">The name of the object (building name, road etc.)</param>
protected void CreateObject(BaseOSMLib.OsmWay way, Material mat, string objectName)
{
// Make sure we have some name to display
objectName = string.IsNullOrEmpty(objectName) ? "OsmWay" : objectName;
// Create an instance of the object and place it in the centre of its points
GameObject go = new GameObject(objectName);
Vector3 localOrigin = GetCentre(way);
go.transform.position = localOrigin - map.bounds.Centre;
// Add the mesh filter and renderer components to the object
MeshFilter mf = go.AddComponent <MeshFilter>();
MeshRenderer mr = go.AddComponent <MeshRenderer>();
// Apply the material
mr.material = mat;
// Create the collections for the object's vertices, indices, UVs etc.
List <Vector3> vectors = new List <Vector3>();
List <Vector3> normals = new List <Vector3>();
List <Vector2> uvs = new List <Vector2>();
List <int> indices = new List <int>();
// Call the child class' object creation code
OnObjectCreated(way, localOrigin, vectors, normals, uvs, indices);
// Apply the data to the mesh
mf.sharedMesh = new Mesh();
mf.sharedMesh.vertices = vectors.ToArray();
mf.sharedMesh.normals = normals.ToArray();
mf.sharedMesh.triangles = indices.ToArray();
mf.sharedMesh.uv = uvs.ToArray();
}
void GetWays(XmlNodeList xmlNodeList)
{
foreach (XmlNode node in xmlNodeList)
{
BaseOSMLib.OsmWay way = new OsmWay(node);
ways.Add(way);
}
}
/// <summary>
/// Get the centre of an object or road.
/// </summary>
/// <param name="way">OsmWay object</param>
/// <returns>The centre point of the object</returns>
protected Vector3 GetCentre(BaseOSMLib.OsmWay way)
{
Vector3 total = Vector3.zero;
foreach (var id in way.NodeIDs)
{
total += map.nodes[id];
}
return(total / way.NodeIDs.Count);
}
protected override void OnObjectCreated(BaseOSMLib.OsmWay way, Vector3 origin, List <Vector3> vectors, List <Vector3> normals, List <Vector2> uvs, List <int> indices)
{
for (int i = 1; i < way.NodeIDs.Count; i++)
{
OsmNode p1 = map.nodes[way.NodeIDs[i - 1]];
OsmNode p2 = map.nodes[way.NodeIDs[i]];
Vector3 s1 = p1 - origin;
Vector3 s2 = p2 - origin;
Vector3 diff = (s2 - s1).normalized;
// https://en.wikipedia.org/wiki/Lane
// According to the article, it's 3.7m in Canada
var cross = Vector3.Cross(diff, Vector3.up) * 3.7f * way.Lanes;
// Create points that represent the width of the road
Vector3 v1 = s1 + cross;
Vector3 v2 = s1 - cross;
Vector3 v3 = s2 + cross;
Vector3 v4 = s2 - cross;
vectors.Add(v1);
vectors.Add(v2);
vectors.Add(v3);
vectors.Add(v4);
uvs.Add(new Vector2(0, 0));
uvs.Add(new Vector2(1, 0));
uvs.Add(new Vector2(0, 1));
uvs.Add(new Vector2(1, 1));
normals.Add(Vector3.up);
normals.Add(Vector3.up);
normals.Add(Vector3.up);
normals.Add(Vector3.up);
int idx1, idx2, idx3, idx4;
idx4 = vectors.Count - 1;
idx3 = vectors.Count - 2;
idx2 = vectors.Count - 3;
idx1 = vectors.Count - 4;
// first triangle v1, v3, v2
indices.Add(idx1);
indices.Add(idx3);
indices.Add(idx2);
// second v3, v4, v2
indices.Add(idx3);
indices.Add(idx4);
indices.Add(idx2);
}
}
/// <summary>
/// Build the object using the data from the OsmWay instance.
/// </summary>
/// <param name="way">OsmWay instance</param>
/// <param name="origin">The origin of the structure</param>
/// <param name="vectors">The vectors (vertices) list</param>
/// <param name="normals">The normals list</param>
/// <param name="uvs">The UVs list</param>
/// <param name="indices">The indices list</param>
protected override void OnObjectCreated(BaseOSMLib.OsmWay way, Vector3 origin, List <Vector3> vectors, List <Vector3> normals, List <Vector2> uvs, List <int> indices)
{
// Get the centre of the roof
Vector3 oTop = new Vector3(0, way.Height, 0);
// First vector is the middle point in the roof
vectors.Add(oTop);
normals.Add(Vector3.up);
uvs.Add(new Vector2(0.5f, 0.5f));
for (int i = 1; i < way.NodeIDs.Count; i++)
{
OsmNode p1 = map.nodes[way.NodeIDs[i - 1]];
OsmNode p2 = map.nodes[way.NodeIDs[i]];
Vector3 v1 = p1 - origin;
Vector3 v2 = p2 - origin;
Vector3 v3 = v1 + new Vector3(0, way.Height, 0);
Vector3 v4 = v2 + new Vector3(0, way.Height, 0);
vectors.Add(v1);
vectors.Add(v2);
vectors.Add(v3);
vectors.Add(v4);
uvs.Add(new Vector2(0, 0));
uvs.Add(new Vector2(1, 0));
uvs.Add(new Vector2(0, 1));
uvs.Add(new Vector2(1, 1));
normals.Add(-Vector3.forward);
normals.Add(-Vector3.forward);
normals.Add(-Vector3.forward);
normals.Add(-Vector3.forward);
int idx1, idx2, idx3, idx4;
idx4 = vectors.Count - 1;
idx3 = vectors.Count - 2;
idx2 = vectors.Count - 3;
idx1 = vectors.Count - 4;
// first triangle v1, v3, v2
indices.Add(idx1);
indices.Add(idx3);
indices.Add(idx2);
// second v3, v4, v2
indices.Add(idx3);
indices.Add(idx4);
indices.Add(idx2);
// third v2, v3, v1
indices.Add(idx2);
indices.Add(idx3);
indices.Add(idx1);
// fourth v2, v4, v3
indices.Add(idx2);
indices.Add(idx4);
indices.Add(idx3);
// And now the roof triangles
indices.Add(0);
indices.Add(idx3);
indices.Add(idx4);
// Don't forget the upside down one!
indices.Add(idx4);
indices.Add(idx3);
indices.Add(0);
}
}
protected abstract void OnObjectCreated(BaseOSMLib.OsmWay way, Vector3 origin, List <Vector3> vectors, List <Vector3> normals, List <Vector2> uvs, List <int> indices);
