private static void AddTriangle(HexMeshData meshData, Vector3 center, Vector3 uv, float neighborElevation, float previousElevation, float nextElevation, HexDirection direction, Color color)
{
var v1 = center;
var v2 = center + meshData.GetFirstSolidCorner(direction);
var v3 = center + meshData.GetSecondSolidCorner(direction);
//Add inner solid triangle
AddTriangle(meshData, v1, v2, v3, color, uv);
//Add Quad To Fill Border Gap
var v4 = v2 + meshData.GetBridge(direction);
v4.y = neighborElevation;
var v5 = v3 + meshData.GetBridge(direction);
v5.y = neighborElevation;
AddQuad(meshData, v2, v3, v4, v5, color, uv);
//Add Triangles to fill gap on sides of quad
var v6 = center + meshData.GetFirstCorner(direction);
v6.y = Mathf.Min(neighborElevation, previousElevation);
AddTriangle(meshData, v2, v6, v4, color, uv);
var v7 = center + meshData.GetSecondCorner(direction);
v7.y = Mathf.Min(neighborElevation, nextElevation);
AddTriangle(meshData, v3, v5, v7, color, uv);
}
private static void AddQuad(HexMeshData meshData, Vector3 v1, Vector3 v2, Vector3 v3, Vector3 v4, Color color, Vector3 uv)
{
var vertexIndex = meshData.Vertices.Count;
meshData.Vertices.Add(v1);
meshData.Vertices.Add(v2);
meshData.Vertices.Add(v3);
meshData.Vertices.Add(v4);
meshData.Colors.Add(color);
meshData.Colors.Add(color);
meshData.Colors.Add(color);
meshData.Colors.Add(color);
meshData.Uv.Add(uv);
meshData.Uv.Add(uv);
meshData.Uv.Add(uv);
meshData.Uv.Add(uv);
meshData.Triangles.Add(vertexIndex);
meshData.Triangles.Add(vertexIndex + 2);
meshData.Triangles.Add(vertexIndex + 1);
meshData.Triangles.Add(vertexIndex + 1);
meshData.Triangles.Add(vertexIndex + 2);
meshData.Triangles.Add(vertexIndex + 3);
}
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());
}