// Drops nature flats based on random chance scaled by simple rules
public static void LayoutNatureBillboards(DaggerfallTerrain dfTerrain, DaggerfallBillboardBatch dfBillboardBatch, float terrainScale, int terrainDist)
{
const float maxSteepness = 50f; // 50
const float slopeSinkRatio = 70f; // Sink flats slightly into ground as slope increases to prevent floaty trees.
const float baseChanceOnDirt = 0.2f; // 0.2
const float baseChanceOnGrass = 0.9f; // 0.4
const float baseChanceOnStone = 0.05f; // 0.05
// Location Rect is expanded slightly to give extra clearance around locations
const int natureClearance = 4;
Rect rect = dfTerrain.MapData.locationRect;
if (rect.x > 0 && rect.y > 0)
{
rect.xMin -= natureClearance;
rect.xMax += natureClearance;
rect.yMin -= natureClearance;
rect.yMax += natureClearance;
}
// Chance scaled based on map pixel height
// This tends to produce sparser lowlands and denser highlands
// Adjust or remove clamp range to influence nature generation
float elevationScale = (dfTerrain.MapData.worldHeight / 128f);
elevationScale = Mathf.Clamp(elevationScale, 0.4f, 1.0f);
// Chance scaled by base climate type
float climateScale = 1.0f;
DFLocation.ClimateSettings climate = MapsFile.GetWorldClimateSettings(dfTerrain.MapData.worldClimate);
switch (climate.ClimateType)
{
case DFLocation.ClimateBaseType.Desert: // Just lower desert for now
climateScale = 0.25f;
break;
}
float chanceOnDirt = baseChanceOnDirt * elevationScale * climateScale;
float chanceOnGrass = baseChanceOnGrass * elevationScale * climateScale;
float chanceOnStone = baseChanceOnStone * elevationScale * climateScale;
// Get terrain
Terrain terrain = dfTerrain.gameObject.GetComponent <Terrain>();
if (!terrain)
{
return;
}
// Get terrain data
TerrainData terrainData = terrain.terrainData;
if (!terrainData)
{
return;
}
// Remove exiting billboards
dfBillboardBatch.Clear();
MeshReplacement.ClearNatureGameObjects(terrain);
// Seed random with terrain key
Random.InitState(MakeTerrainKey(dfTerrain.MapPixelX, dfTerrain.MapPixelY));
// Just layout some random flats spread evenly across entire map pixel area
// Flats are aligned with tiles, max 16129 billboards per batch
Vector2 tilePos = Vector2.zero;
int tDim = MapsFile.WorldMapTileDim;
int hDim = DaggerfallUnity.Instance.TerrainSampler.HeightmapDimension;
float scale = terrainData.heightmapScale.x * (float)hDim / (float)tDim;
float maxTerrainHeight = DaggerfallUnity.Instance.TerrainSampler.MaxTerrainHeight;
float beachLine = DaggerfallUnity.Instance.TerrainSampler.BeachElevation;
for (int y = 0; y < tDim; y++)
{
for (int x = 0; x < tDim; x++)
{
// Reject based on steepness
float steepness = terrainData.GetSteepness((float)x / tDim, (float)y / tDim);
if (steepness > maxSteepness)
{
continue;
}
// Reject if inside location rect (expanded slightly to give extra clearance around locations)
tilePos.x = x;
tilePos.y = y;
if (rect.x > 0 && rect.y > 0 && rect.Contains(tilePos))
{
continue;
}
// Chance also determined by tile type
int tile = dfTerrain.MapData.tilemapSamples[x, y] & 0x3F;
if (tile == 1)
{ // Dirt
if (Random.Range(0f, 1f) > chanceOnDirt)
{
continue;
}
}
else if (tile == 2)
{ // Grass
if (Random.Range(0f, 1f) > chanceOnGrass)
{
continue;
}
}
else if (tile == 3)
{ // Stone
if (Random.Range(0f, 1f) > chanceOnStone)
{
continue;
}
}
else
{ // Anything else
continue;
}
int hx = (int)Mathf.Clamp(hDim * ((float)x / (float)tDim), 0, hDim - 1);
int hy = (int)Mathf.Clamp(hDim * ((float)y / (float)tDim), 0, hDim - 1);
float height = dfTerrain.MapData.heightmapSamples[hy, hx] * maxTerrainHeight; // x & y swapped in heightmap for TerrainData.SetHeights()
// Reject if too close to water
if (height < beachLine)
{
continue;
}
// Sample height and position billboard
Vector3 pos = new Vector3(x * scale, 0, y * scale);
float height2 = terrain.SampleHeight(pos + terrain.transform.position);
pos.y = height2 - (steepness / slopeSinkRatio);
// Add to batch unless a mesh replacement is found
int record = Random.Range(1, 32);
if (terrainDist > 1 || !MeshReplacement.ImportNatureGameObject(dfBillboardBatch.TextureArchive, record, terrain, x, y))
{
dfBillboardBatch.AddItem(record, pos);
}
else if (!NatureMeshUsed)
{
NatureMeshUsed = true; // Signal that nature mesh has been used to initiate extra terrain updates
}
}
}
// Apply new batch
dfBillboardBatch.Apply();
}