public static Mesh GenerateHexagonMesh(float radius, float border, int startX, int startY, int chunkWidth, int chunkHeight, int mapWidth, int mapHeight, float[] heightMap, Func <float, Color> colorFunction, Func <float, float> elevationFunction)
{
var meshData = new HexMeshData(radius, border);
for (int dy = 0; dy < chunkHeight && (startY + dy) < mapHeight; dy++)
{
for (int dx = 0; dx < chunkWidth && (startX + dx) < mapWidth; dx++)
{
int x = startX + dx;
int y = startY + dy;
var index = (y * mapWidth) + x;
var xOffset = x + y * 0.5f - (int)(y / 2);
var center = new Vector3(xOffset * meshData.InnerRadius * 2, 0, y * meshData.OuterRadius * 1.5f);
for (var direction = 0; direction < 6; direction++)
{
var elevation = elevationFunction?.Invoke(heightMap[index]) ?? 0;
var previousNeighborElevation = elevation;
var neighborElevation = elevation;
var nextNeighborElevation = elevation;
var neighbor = GetNeighbor(index, (HexDirection)direction, mapWidth, mapHeight);
if (neighbor != -1)
{
neighborElevation = Mathf.Min(elevation, elevationFunction?.Invoke(heightMap[neighbor]) ?? 0);
}
neighbor = GetNeighbor(index, ((HexDirection)direction).Previous(), mapWidth, mapHeight);
if (neighbor != -1)
{
previousNeighborElevation = Mathf.Min(elevation, elevationFunction?.Invoke(heightMap[neighbor]) ?? 0);
}
neighbor = GetNeighbor(index, ((HexDirection)direction).Next(), mapWidth, mapHeight);
if (neighbor != -1)
{
nextNeighborElevation = Mathf.Min(elevation, elevationFunction?.Invoke(heightMap[neighbor]) ?? 0);
}
center.y = elevation;
var color = colorFunction?.Invoke(heightMap[index]) ?? Color.white;
var uv = new Vector2(x / (float)mapWidth, y / (float)mapHeight);
AddTriangle(meshData, center, uv, neighborElevation, previousNeighborElevation, nextNeighborElevation, (HexDirection)direction, color);
}
}
}
return(meshData.CreateMesh());
}
