// Get biome layer topology and smooth between layers at edges using Perlin or Simplex noise
private Topology GetBiomeTopology(int x, int z, Column column, TerrainLibrary.Biome biome)
{
// Global voxel column coordinates
int gx = (int)(x + column.position.x);
int gz = (int)(z + column.position.z);
// Base noise to map biome layers and base height
float baseNoise = biome.BaseNoise(gx, gz);
TerrainLibrary.BiomeLayer layer = biome.GetLayer(baseNoise);
// Do not overwrite data for this block when getting adjacent biome topology
if (column.biomeLayers[x, z] == null)
{
column.biomeLayers[x, z] = layer;
}
// Make sure gradient margins don't overlap
float margin = (layer.max - layer.min) / 2;
// Clamp margin at max
margin = margin > layer.maxMargin ? layer.maxMargin : margin;
// Layer height data for current layer
Topology currentTopology = new Topology(layer.Noise(gx, gz),
layer.maxHeight,
baseNoise);
// Closeness to top and bottom of baseNoise range defining this biome layer
float bottomGradient = EdgeGradient(baseNoise, layer.min, margin);
float topGradient = EdgeGradient(baseNoise, layer.max, margin);
TerrainLibrary.BiomeLayer adjacentLayer = null;
float interpValue;
// Smooth to above layer
if (bottomGradient != 2 && layer.min != 0)
{
adjacentLayer = biome.layers[layer.index - 1];
interpValue = bottomGradient;
}
// Smooth to below layer
else if (topGradient != 2 && layer.max != 1)
{
adjacentLayer = biome.layers[layer.index + 1];
interpValue = topGradient;
}
// Not within margin distance of another layer
else
{
// No smoothing required
return(new Topology(currentTopology.noise, currentTopology.height, baseNoise));
}
// Layer height data for adjacent layer
Topology adjacentTopology = new Topology(adjacentLayer.Noise(gx, gz),
adjacentLayer.maxHeight,
baseNoise);
// Return smoothed topology
return(SmoothTopologys(currentTopology, adjacentTopology, interpValue));
}
// Get biome topology and smooth between biomes if necessary
// using Cellular value and distance-to-edge noise respectively
public void GetTopologyData(Column column)
{
int chunkSize = World.chunkSize;
column.heightMap = new int[chunkSize, chunkSize];
// Iterate over height map
for (int x = 0; x < chunkSize; x++)
{
for (int z = 0; z < chunkSize; z++)
{
// Global voxel column coordinates
int gx = (int)(x + column.position.x);
int gz = (int)(z + column.position.z);
// Get cellular noise data
FastNoise.EdgeData edgeData = column.edgeMap[x, z];
// Get current biome type
TerrainLibrary.Biome currentBiome = worldBiomes.GetBiome(edgeData.currentCellValue);
// Get adjacent biome type
TerrainLibrary.Biome adjacentBiome = worldBiomes.GetBiome(edgeData.adjacentCellValue);
// Get topology for this pixel
Topology currentTolopogy = GetBiomeTopology(x, z, column, currentBiome);
Topology finalTopology;
// Within smoothing radius and adjacent biome is different
if (edgeData.distance2Edge < worldBiomes.smoothRadius && currentBiome != adjacentBiome)
{
if (!column.biomeBoundary)
{
column.biomeBoundary = true;
}
float InterpValue = Mathf.InverseLerp(0, worldBiomes.smoothRadius, edgeData.distance2Edge);
// Get topology for this pixel if adjacent biome type
Topology adjacentTopology = GetBiomeTopology(x, z, column, adjacentBiome);
// Smooth between topologys
finalTopology = SmoothTopologys(currentTolopogy, adjacentTopology, InterpValue);
}
else
{
finalTopology = currentTolopogy;
}
int POIheight = 0;
// Where points of interest exist, flatten terrain
if (column.POIHeightGradient != null && column.POIHeightGradient[x, z] != 0)
{
float interpValue = (float)column.POIHeightGradient[x, z] / chunkSize;
Topology POITopology = new Topology(0.5f, finalTopology.height, 0.5f);
finalTopology = SmoothToPOI(POITopology, finalTopology, interpValue);
// Adjust heighest point
POIheight = column.POIType.wallHeight;
}
// Generate final height value for chunk data
column.heightMap[x, z] = (int)Mathf.Lerp(0, finalTopology.height, finalTopology.baseNoise * finalTopology.noise);
// Update highest and lowest block in chunk column
column.CheckHighest(column.heightMap[x, z] + POIheight);
column.CheckLowest(column.heightMap[x, z]);
}
}
}