public override IEnumerator PlaceBuildings(CityBlock block, List <BuildingVariant> variants)
{
this.block = block;
this.variants = variants;
Placed = new List <Building>();
PickAcceptableRotations();
FilterVariantsBasedOnAllowedHeight();
float occupiedArea = 0;
float occupiedAreaMin = block.Area * minAreaFraction;
//DB.Log($"block.Area: {block.Area}");
int findPositionFailCounter = 0;
int resetCounter = 0;
//The algorithm is going to fill the area with buildings so that at least occupiedAreaMin is filled.
//However, it might run into situations where it's unlikely that a combination of building size, rotation will be
//able to be acommodated, and the alg will fail to find a suitable position many times. If that ever happens, the buildings
//that were already placed are erased and the alg resets. If it resets too many times, the occupiedAreaMin will
//get smaller to prevent getting stuck. This is only a precaution and isn't likely to happen, unless settings
//within building variants are so strict and prohibitive (eg minimal sizes are so large they can't be fit) that
//the alg can't find any place to put them. This could be additionaly prevented with some additional checks and balances
//in the future.
while (occupiedArea < occupiedAreaMin)
{
Quaternion rot = acceptableRotations.RandomElement();
BuildingVariant pickedVariant = variants.RandomElement();
float wallLengthX = pickedVariant.GetRandomWallLength();
float wallLengthZ = (GS.RChance(squareChance)) ? wallLengthX : pickedVariant.GetRandomWallLength(wallLengthX);
Vector3 pos;
bool foundPosition = TryFindSuitablePosition(pickedVariant, rot, wallLengthX, wallLengthZ, out pos);
if (foundPosition)
{
PlaceVariant(pickedVariant, pos, rot, wallLengthX, wallLengthZ);
occupiedArea += wallLengthX * wallLengthZ;
}
else
{
//Debug.DrawRay(pos, Vector3.up * 10f, Color.red, 10f);
findPositionFailCounter++;
if (findPositionFailCounter >= maxFindPositionFails)
{
//reset
resetCounter++;
findPositionFailCounter = 0;
occupiedArea = 0;
DestroyPlaced();
if (resetCounter >= maxResets)
{
resetCounter = 0;
occupiedAreaMin = (occupiedAreaMin - 1f) * 0.9f;
}
yield return(null);
}
}
}
}
private bool TryFindSuitablePosition(BuildingVariant variant, Quaternion rot, float xWall, float zWall, out Vector3 pos)
{
pos = block.GetRandomPoint();
Vector3 halfEx = new Vector3(xWall * 0.5f + buildingSeparation, buildingsGen.MaxHeight, zWall * 0.5f + buildingSeparation);
//for a position to be suitable, there needs to be no buildings there,
//it has to not exceed the city block
//and it has to allow a height that is within the range possible for the building variant
LayerMask mask = Layers.GetMask(Layer.Building) | Layers.GetMask(Layer.Street);
bool spaceIsFree = Physics.OverlapBox(pos, halfEx, rot, mask).Length == 0;
float hAtPosMin = GetHeightMin(pos.UnShiftToV2());
float hAtPosMax = GetHeightMax(pos.UnShiftToV2());
bool heightWithinRange = (hAtPosMin < variant.HeightMax) && (hAtPosMax > variant.HeightMin);
return(spaceIsFree && heightWithinRange);
}
private void PlaceVariant(BuildingVariant variant, Vector3 pos, Quaternion rot, float xWall, float zWall)
{
//to place a building variant first thing that needs to happen is
//calc of the elevation to which the building foundation will extend
//which is the highest place within the building area + foundation height
Vector3 castOrigin = pos.SwapY(buildingsGen.MaxHeight);
Vector3 halfEx = new Vector3(xWall * 0.5f, 1f, zWall * 0.5f);
LayerMask mask = Layers.GetMask(Layer.CityBlockTerrain);
RaycastHit hit;
float foundationElev = pos.y;
if (Physics.BoxCast(castOrigin, halfEx, Vector3.down, out hit, rot, buildingsGen.MaxHeight * 2, mask))
{
foundationElev = hit.point.y;
}
foundationElev += variant.FoundationHeight;
float foundationBottom = foundationElev - 20;
float foundationYSpan = foundationElev - foundationBottom;
Vector3 foundationDimentions = new Vector3(xWall, foundationYSpan, zWall);
Mesh foundationMesh = MeshGenerator.GenerateBox(foundationDimentions * 0.5f);
Vector3 foundationPos = pos.SwapY(foundationElev - 0.5f * foundationYSpan);
MeshFilter instFoundation = Instantiate(variant.PrefabFoundation, foundationPos, rot);
instFoundation.mesh = foundationMesh;
BoxCollider col = instFoundation.gameObject.AddComponent <BoxCollider>();
col.size = foundationDimentions;
Vector2 pos2D = pos.UnShiftToV2();
int storiesMin = Mathf.Max(variant.StoriesMin, Mathf.FloorToInt(GetHeightMin(pos2D) / variant.StoryHeight));
int storiesMax = Mathf.Min(variant.StoriesMax, Mathf.CeilToInt(GetHeightMax(pos2D) / variant.StoryHeight));
float bodyHeight = Random.Range(storiesMin, storiesMax + 1) * variant.StoryHeight;
Vector3 bodyDimentions = new Vector3(xWall, bodyHeight, zWall);
Mesh bodyMesh = MeshGenerator.GenerateBox(bodyDimentions * 0.5f);
Vector3 bodyPosition = pos.SwapY(foundationElev + bodyHeight * 0.5f);
MeshFilter instBody = Instantiate(variant.PrefabBody, bodyPosition, rot);
instBody.mesh = bodyMesh;
Building newlyPlaced = instBody.gameObject.AddComponent <Building>();
col = instBody.gameObject.AddComponent <BoxCollider>();
col.size = bodyDimentions;
instFoundation.transform.parent = newlyPlaced.transform;
Placed.Add(newlyPlaced);
}
/// <summary>
/// Creates a Building of a given race and type from a prefab in a certain position and rotation
/// </summary>
/// <param name="race">Race of the Building</param>
/// <param name="type">Type of the Building</param>
/// <param name="position">Building position</param>
/// <param name="rotation">Building rotation</param>
/// <returns>The created GameObject</returns>
public GameObject createBuilding(Races race, BuildingTypes type, Vector3 position, Quaternion rotation, BuildingVariant variant = BuildingVariant.REAL)
{
string prefab = getPrefab(race, type, (int)variant);
return(UnityEngine.Object.Instantiate((GameObject)Resources.Load(prefab, typeof(GameObject)), position, rotation) as GameObject);
}
/// <summary>
/// Creates a Building of a given race and type from a prefab
/// </summary>
/// <param name="race">Race of the Building</param>
/// <param name="type">Type of the Building</param>
/// <returns>The created GameObject</returns>
public GameObject createBuilding(Races race, BuildingTypes type, BuildingVariant variant = BuildingVariant.REAL)
{
string prefab = getPrefab(race, type, (int)variant);
return(UnityEngine.Object.Instantiate((GameObject)Resources.Load(prefab, typeof(GameObject))));
}
