// extrude section (2D) into a 3D mesh
public static Mesh Extrude(Section section, float h)
{
Vector3[] vtx;
int[] tri;
Mesh mesh = new Mesh();
Polygon poly = PolyTool.Clean(SectTool.ToPoly(section));
//center = PolyTool.Centroid (poly);
poly = PolyTool.Recenter(poly, new Vector2(0, 0));
List <Vector3> ptbottom = poly.Select(v => new Vector3(v.x, TerrainAt(v), v.y)).ToList();
List <Vector3> pttop = poly.Select(v => new Vector3(v.x, TerrainAt(v) + h, v.y)).ToList();
List <int> idxbottom = Triangulate(poly);
List <int> idxtop = idxbottom.Select(x => x + poly.Count).ToList();
idxbottom.Reverse();
List <int> idxside = new List <int> ();
for (int i = 0; i < poly.Count; i++)
{
idxside.Add(i);
idxside.Add((i + 1) % poly.Count);
idxside.Add(i + poly.Count);
idxside.Add((i + 1) % poly.Count);
idxside.Add((i + 1) % poly.Count + poly.Count);
idxside.Add(i + poly.Count);
}
List <Vector3> allpts = new List <Vector3> ();
allpts.AddRange(ptbottom);
allpts.AddRange(pttop);
List <int> alltris = new List <int> ();
alltris.AddRange(idxbottom);
alltris.AddRange(idxtop);
alltris.AddRange(idxside);
vtx = allpts.ToArray();
tri = alltris.ToArray();
mesh.vertices = vtx;
mesh.triangles = tri;
return(mesh);
}
// generate city instance
public static GameObject Generate()
{
// output gameobject
GameObject gout = new GameObject();
gout.name = "CITY";
// block plans
List <Section> sections = new List <Section>();
// building plans
List <Section> units = new List <Section>();
// roads
List <Road> roads = new List <Road> ();
// city size
float tsize = 200;
Section bedrock = SectTool.Box(0, 0, tsize, tsize);
sections.Add(bedrock);
// drawing functions
System.Action <Section, float, string> MkExtrudeSect =
delegate(Section s, float h, string matname) {
Vector2 c = PolyTool.Centroid(SectTool.ToPoly(s));
Mesh m = MeshMaker.Extrude(s, h);
GameObject g = MeshMaker.ToObject(m, matname);
if (!BadVal(c.x))
{
g.transform.position = new Vector3(c.x, 0, c.y);
}
g.name = matname;
g.transform.parent = gout.transform;
};
System.Action <Vector3, Vector3, Quaternion, string> MkCube
=
delegate(Vector3 pos, Vector3 size, Quaternion rot, string matname) {
GameObject g = GameObject.CreatePrimitive(PrimitiveType.Cube);
g.transform.localPosition = pos;
g.transform.localScale = size;
g.transform.localRotation = rot;
g.GetComponent <Renderer>().material = MaterialManager.GetMaterialByName(matname);
g.name = matname;
g.transform.parent = gout.transform;
};
System.Action <Vector3, Vector3, Quaternion, string> MkBlob =
delegate(Vector3 pos, Vector3 size, Quaternion rot, string matname) {
GameObject g = MeshMaker.ToObject(MeshMaker.Blob(size), matname);
g.transform.localPosition = pos;
g.transform.localScale = size;
g.transform.localRotation = rot;
g.GetComponent <Renderer>().material = MaterialManager.GetMaterialByName(matname);
g.name = matname;
g.transform.parent = gout.transform;
};
System.Action <Vector2> MkTree =
delegate(Vector2 pos) {
float w = 0.07f * Random.Range(0.8f, 1.5f);
float h = Random.Range(0.8f, 1.5f);
MkCube(new Vector3(pos.x, h / 2, pos.y),
new Vector3(w, h, w),
Quaternion.Euler(new Vector3(
Random.Range(-0.2f, 0.2f),
Random.Range(-0.2f, 0.2f),
Random.Range(-0.2f, 0.2f)
)),
"VEGETATION");
for (int i = 0; i < 5; i++)
{
float r = Random.Range(1f, 2f);
MkBlob(new Vector3(pos.x, h, pos.y)
+ new Vector3(
Random.Range(-0.5f, 0.5f),
Random.Range(-0.2f, 0.8f),
Random.Range(-0.5f, 0.5f)),
new Vector3(
r, r, r
),
Random.rotation,
"VEGETATION");
}
};
System.Action <Vector2> MkStreetLight =
delegate(Vector2 pos) {
float w = 0.05f;
float h = 1.2f;
MkCube(new Vector3(pos.x, h / 2, pos.y),
new Vector3(w, h, w),
Quaternion.identity,
"POLE");
MkCube(new Vector3(pos.x, h, pos.y),
new Vector3(0.1f, 0.15f, 0.1f),
Quaternion.identity,
"STATIC");
};
System.Action <Vector2> MkSign =
delegate(Vector2 pos) {
float w = 0.05f;
float h = 1f;
MkCube(new Vector3(pos.x, h / 2, pos.y),
new Vector3(w, h, w),
Quaternion.identity,
"POLE");
for (int i = 0; i < Random.Range(1, 4); i++)
{
MkCube(new Vector3(pos.x, h - i * 0.3f, pos.y + 0.03f),
new Vector3(0.24f, 0.24f, 0.02f),
Quaternion.identity,
"TRAFFIC_SIGN");
}
};
System.Action <Vector2> MkTrafficLight =
delegate(Vector2 pos) {
float w = 0.05f;
float h = 1f;
MkCube(new Vector3(pos.x, h / 2, pos.y),
new Vector3(w, h, w),
Quaternion.identity,
"POLE");
MkCube(new Vector3(pos.x, h, pos.y),
new Vector3(0.1f, 0.3f, 0.08f),
Quaternion.identity,
"TRAFFIC_LIGHT");
};
System.Action <Vector2> MkTrafficLightBig =
delegate(Vector2 pos) {
float w = 0.05f;
float h = 2f;
float l = Random.Range(1, 4);
float r = Random.Range(0f, Mathf.PI * 2);
Quaternion R = Quaternion.Euler(new Vector3(0, 90 - r * 180 / Mathf.PI, 0));
MkCube(new Vector3(pos.x, h / 2, pos.y),
new Vector3(w, h, w),
Quaternion.identity,
"POLE");
MkCube(new Vector3(pos.x + (l / 2) * Mathf.Cos(r), h, pos.y + (l / 2) * Mathf.Sin(r)),
new Vector3(w, w, l),
R,
"POLE");
for (float i = 0; i < l; i += 0.5f)
{
if (Random.value < 0.6f || i == 0)
{
MkCube(new Vector3(pos.x + (l - i) * Mathf.Cos(r), h, pos.y + (l - i) * Mathf.Sin(r)),
new Vector3(0.1f, 0.3f, 0.08f),
R,
"TRAFFIC_LIGHT");
}
else
{
MkCube(new Vector3(pos.x + (l - i) * Mathf.Cos(r), h, pos.y + (l - i) * Mathf.Sin(r))
+ R * new Vector3(0.03f, 0, 0f),
new Vector3(0.02f, 0.24f, 0.24f),
R,
"TRAFFIC_SIGN");
}
}
for (int i = 0; i < Random.Range(1, 3); i++)
{
MkCube(new Vector3(pos.x, h / 2 - i * 0.3f, pos.y + 0.03f),
new Vector3(0.24f, 0.24f, 0.02f),
Quaternion.identity,
"TRAFFIC_SIGN");
}
};
MeshMaker.Triangulate = PolyTool.QkTriangulate;
MkExtrudeSect(bedrock, 0.05f, "GROUND");
for (int i = 0; i < 10; i++)
{
List <Edge> edges;
sections = SectTool.SplitAll(sections, out edges);
for (int j = 0; j < edges.Count; j++)
{
roads.Add(new Road(edges[j], 6 - (float)i / 2));
}
}
// generate structures along roads
for (int i = 0; i < roads.Count; i++)
{
MeshMaker.Triangulate = PolyTool.TbTriangulate;
Section s = EdgeTool.Tubify(roads[i].edge, roads[i].width / 2);
MkExtrudeSect(s, 0.07f, "ROAD");
Edge e0 = s[0];
Edge e1 = s[1];
Section s0 = EdgeTool.Tubify(e0, roads[i].width / 2);
Section s1 = EdgeTool.Tubify(e1, roads[i].width / 2);
MkExtrudeSect(s0, 0.06f, "SIDEWALK");
MkExtrudeSect(s1, 0.06f, "SIDEWALK");
System.Func <Vector2, bool> isCross = delegate(Vector2 pt) {
for (int n = 0; n < roads.Count; n++)
{
if (roads [n].edge.Count >= 1)
{
Edge e = roads [n].edge;
if (Vector2.Distance(pt, e [0]) < 3 ||
Vector2.Distance(pt, e [e.Count - 1]) < 3)
{
return(true);
}
}
}
return(false);
};
for (int j = 2; j < Mathf.Max(0, Mathf.Min(e0.Count, e1.Count) - 2); j++)
{
int reso = 24;
for (int k = 0; k < reso; k++)
{
Vector2 p0 = Vector2.Lerp(e0 [j], e0 [j + 1], ((float)k) / reso);
Vector2 p1 = Vector2.Lerp(e1 [j], e1 [j + 1], ((float)k) / reso);
bool ic0 = isCross(p0);
bool ic1 = isCross(p1);
if (k % 8 == 0)
{
if (!ic0)
{
MkStreetLight(p0);
}
else if (Random.value < 0.3f)
{
if (Random.value < 0.5f)
{
MkTrafficLightBig(p0);
}
else
{
MkTrafficLight(p0);
}
}
if (!ic1)
{
MkStreetLight(p1);
}
else if (Random.value < 0.3f)
{
if (Random.value < 0.5f)
{
MkTrafficLightBig(p1);
}
else
{
MkTrafficLight(p1);
}
}
}
else if (k % 8 == 4)
{
if (!ic0)
{
MkTree(p0);
}
if (!ic1)
{
MkTree(p1);
}
}
else if (Random.value < 0.05f)
{
if (!ic0)
{
MkSign(p0);
}
if (!ic1)
{
MkSign(p1);
}
}
}
}
}
for (int i = 0; i < sections.Count; i++)
{
units.AddRange(SectTool.GridSection(sections [i]));
}
for (int i = 0; i < units.Count; i++)
{
Vector2 c = PolyTool.Centroid(SectTool.ToPoly(units [i]));
float d2c = Vector2.Distance(c, new Vector2(tsize / 2, tsize / 2));
float a = SectTool.EstArea(units [i]);
float h = Mathf.PerlinNoise(c.x * 0.1f, c.y * 0.1f) * 200 / Mathf.Pow(d2c, 0.5f) / Mathf.Pow(a, 0.5f) + Random.Range(-5.0f, 5.0f);
MeshMaker.Triangulate = PolyTool.QkTriangulate;
MkExtrudeSect(units[i], Mathf.Max(h, 1f), "BUILDING");
}
for (int i = 0; i < 4000; i++)
{
GameObject car = new GameObject();
car.transform.parent = gout.transform;
car.AddComponent <Car> ();
car.GetComponent <Car> ().roads = roads;
}
return(gout);
}
