/// <summary>
/// Sets the decoration for a specific cell
/// </summary>
/// <param name="cell">The cell to set for</param>
/// <param name="cellMappedData">The cell's mapped data</param>
/// <param name="mesh">The decoration mesh</param>
private void SetCellDecoration(Cell cell, CellMappedData cellMappedData, string decoration)
{
if (cellMappedData.Decoration.Key == decoration)
{
return;
}
// Free old decoration
if (cellMappedData.Decoration.Key != null)
{
this.decorations[cellMappedData.Decoration.Key].FreeIndex(cellMappedData.Decoration.Value);
}
// Set new decoration
if (decoration != null && decoration.Length > 0)
{
var index = this.decorations[decoration].GetFreeIndex();
cellMappedData.Decoration = new KeyValuePair <string, int>(decoration, index);
this.decorations[decoration].SetPosition(index, new Vector3(TopographyHelper.HexToWorld(cell.Coordinates), (float)cell.Elevation));
}
else
{
cellMappedData.Decoration = new KeyValuePair <string, int>(null, 0);
}
}
public void GenerateWorld(int radius)
{
double statLowestPoint = double.MaxValue;
double statHighestMountain = double.MinValue;
int statSeaTiles = 0;
Perlin perlin = new Perlin(5);
float boundsX = TopographyHelper.HexToWorld(new Point(radius, 0)).X;
float boundsY = TopographyHelper.HexToWorld(new Point(0, radius)).Y;
var perlinZ = random.NextDouble();
scene.WorldMap = new Map(radius);
for (int p = -radius; p <= radius; p++)
{
for (int q = -radius; q <= radius; q++)
{
var currentPoint = new Point(p, q);
var cell = scene.WorldMap.GetCell(p, q);
if (cell == null)
{
continue;
}
// TODO: Remove Magic Numbers, put them in WorldSettings
// Set cell neighbors
cell.Neighbours = scene.WorldMap.GetNeighbours(currentPoint);
// Set cell height
var worldPoint = TopographyHelper.HexToWorld(currentPoint);
var perlinPoint = (worldPoint + new Vector2(boundsX, boundsY)) * 0.01f;
var elevation = perlin.OctavePerlin(perlinPoint.X, perlinPoint.Y, perlinZ, 4, 0.7);
// Flat valleys
elevation = Math.Pow(elevation, scene.Settings.ElevationPower);
// Actually multiply to max height
elevation *= scene.Settings.ElevationMultiplier;
// Give cells closer to the edge of the map a negative bias. This means the entire map will be surrounded by oceans.
var distanceFromEdge = (radius - TopographyHelper.Distance(new Point(0, 0), currentPoint)) / radius;
if (distanceFromEdge < 0 || distanceFromEdge > 1)
{
throw new Exception("Value out of range, check math");
}
cell.Elevation = elevation * Math.Pow(distanceFromEdge, scene.Settings.EdgeDistancePower);
// Update stats
if (cell.Elevation > statHighestMountain)
{
statHighestMountain = cell.Elevation;
}
if (cell.Elevation < statLowestPoint)
{
// Now all data has been set, calculate the modifiers
statLowestPoint = cell.Elevation;
}
// Set wetness by rain
var rain = perlin.OctavePerlin(perlinPoint.X, perlinPoint.Y, perlinZ * 100, 2, 0.7) * scene.Settings.RainMultiplier;
cell.Wetness = rain;
}
}
// Creates oceans by flood filling from map edge
FloodFillOceans();
// Do final touchups and modifier calculation
// TODO: This can contain NULL cells, this is bad
var cells = scene.WorldMap.Cells;
foreach (var cell in cells)
{
if (cell == null)
{
continue;
}
// Remove single-cell 'seas' and islands
if (cell.IsWater)
{
bool canBeWater = false;
foreach (var n in cell.Neighbours)
{
if (n.IsWater)
{
canBeWater = true; break;
}
}
cell.IsWater = canBeWater;
}
else
{
bool canBeLand = false;
foreach (var n in cell.Neighbours)
{
if (!n.IsWater)
{
canBeLand = true; break;
}
}
cell.IsWater = !canBeLand;
}
// Calculate temperature
var distanceFromEdge = (radius - TopographyHelper.Distance(new Point(0, 0), cell.Coordinates)) / radius;
var temperature = MathHelper.Lerp(scene.Settings.PoleTemperature, scene.Settings.EquatorTemperature,
(float)Math.Pow(distanceFromEdge, scene.Settings.TemperatureCurvePower));
var relElevation = (float)cell.Elevation - scene.Settings.SeaLevel;
if (!cell.IsWater)
{
// Ocean tiles should have temperature at sea level only, otherwise use altitude multiplier
temperature += relElevation * scene.Settings.ElevationTemperatureMultiplier;
}
cell.Temperature = temperature;
// Set values
if (cell.IsWater == true)
{
statSeaTiles++;
cell.FoodMod = random.NextDouble() + random.Next(1, 2);
cell.ResourceMod = random.NextDouble() + random.Next(1, 2);
cell.MaxHousing = 0;
}
else
{
// Now all data has been set, calculate the modifiers
cell.FoodMod = random.NextDouble() + random.Next(1, 5);
cell.ResourceMod = random.NextDouble() + random.Next(1, 5);
cell.WealthMod = random.NextDouble() + random.Next(1, 5);
cell.MaxHousing = random.Next(0, 1250) + random.Next(0, 1250) + random.Next(0, 1250) + random.Next(0, 1250);
}
// Set biome
AssignBiome(cell);
}
//SimulateWaterflow();
// Log stats
Debug.WriteLine("Stats for World Generation");
Debug.WriteLine("Highest Point: " + statHighestMountain);
Debug.WriteLine("Lowest Point: " + statLowestPoint);
Debug.WriteLine("Ocean Cells: " + statSeaTiles);
Debug.WriteLine("Land Cells: " + (scene.WorldMap.CellCount - statSeaTiles));
Debug.WriteLine("Water coverage:" + ((float)statSeaTiles / scene.WorldMap.CellCount * 100).ToString("##.##") + "%");
}
/// <summary>
/// Generates terrain meshes, cell and biome data from a scene. Can be put in a task.
/// </summary>
/// <param name="scene">The scene to generate from</param>
/// <returns>Results</returns>
private MeshGenerationResult GenerateMeshesFromScene(Scene scene)
{
// Results
var renderableMeshes = new List <RenderableMesh>();
var rawMeshes = new List <Mesh>();
var cellData = new Dictionary <Cell, CellMappedData>();
// Stopwatch used for performance logging
Stopwatch stopwatch = new Stopwatch();
stopwatch.Start();
// Create world meshes
var hexCombiner = new MeshCombiner();
int range = scene.WorldMap.Radius;
for (int p = -range; p <= range; p++)
{
for (int q = -range; q <= range; q++)
{
var cell = scene.WorldMap.GetCell(p, q);
// Due to the hexagonal shape we might be out of bounds
if (cell == null)
{
continue;
}
var worldPoint = TopographyHelper.HexToWorld(new Point(p, q));
var position = new Vector3(worldPoint, (float)cell.Elevation);
var color = GetCellColor(cell);
Mesh mesh = biomeMappedData[cell.Biome.Name].HexMesh;
// Ensure sea is actually level
if (cell.IsWater && cell.Elevation < scene.Settings.SeaLevel)
{
position.Z = scene.Settings.SeaLevel;
}
// Add it to the combiner, using the cell's location as a tag so we can later
// get the vertexes of this hex inside the larger mesh
int meshIndex = hexCombiner.Add(new MeshInstance
{
mesh = mesh,
matrix = Matrix.CreateTranslation(position),
tag = new Point(p, q),
color = color,
useColor = true,
});
// Register partial cell mapped data to be used later
var cellMappedData = new CellMappedData
{
MeshIndex = meshIndex
};
cellData[cell] = cellMappedData;
}
}
// Combine meshes
var meshList = hexCombiner.GetCombinedMeshes();
for (int i = 0; i < meshList.Count; i++)
{
var renderable = new RenderableMesh(orbis.GraphicsDevice, meshList[i]);
renderableMeshes.Add(renderable);
}
// Finish cell mapped data
foreach (var cell in cellData)
{
var mesh = meshList[cell.Value.MeshIndex];
cell.Value.VertexIndexes = mesh.TagIndexMap[cell.Key.Coordinates];
}
stopwatch.Stop();
Debug.WriteLine("Generated " + renderableMeshes.Count + " meshes in " + stopwatch.ElapsedMilliseconds + " ms");
return(new MeshGenerationResult {
cellData = cellData,
rawMeshes = rawMeshes,
renderableMeshes = renderableMeshes
});
}