void SetManualTrees(int nTrees)
{
// int nTrees = 2000000;
Unity.Mathematics.Random random = new Unity.Mathematics.Random(1);
for (int i = 0; i < treeManualPrefabs.Length; i++)
{
List <float3> treeInstances = new List <float3>();
for (int j = 0; j < nTrees; j++)
{
float2 pos = random.NextFloat2();
float treeBiome = NoiseExtensions.SNoise(pos, 1f, 2f, 0.5f, 1, 5f, new float2(10000, 0));
if (treeBiome < 0.8f)
{
float height = terrain.SampleHeight(new float3((pos.x - 0.5f) * size, 0f, (pos.y - 0.5f) * size));
if (height > 337f)
{
treeInstances.Add(
new float3(
(pos.x - 0.5f) * size,
height,
(pos.y - 0.5f) * size
)
);
}
}
}
BillboardsManager.active.UpdatePositions(treeManualPrefabs[i], treeInstances.ToArray());
}
}
void SetBuildInTrees(int nTrees)
{
// Tree prototypes
TreePrototype[] treePrototypes = new TreePrototype[treeBuildInPrefabs.Length];
for (int i = 0; i < treePrototypes.Length; i++)
{
treePrototypes[i] = new TreePrototype()
{
prefab = treeBuildInPrefabs[i],
bendFactor = 0.1f
};
}
terrainData.treePrototypes = treePrototypes;
// Tree instances
List <TreeInstance> treeInstances = new List <TreeInstance>();
Unity.Mathematics.Random random = new Unity.Mathematics.Random(1);
for (int i = 0; i < treeBuildInPrefabs.Length; i++)
{
for (int j = 0; j < nTrees; j++)
{
float2 pos = random.NextFloat2();
float treeBiome = NoiseExtensions.SNoise(pos, 1f, 2f, 0.5f, 1, 5f, new float2(10000, 0));
if (treeBiome < 0.8f)
{
float height = terrain.SampleHeight(new float3((pos.x - 0.5f) * size, 0f, (pos.y - 0.5f) * size));
if (height > 337f)
{
treeInstances.Add(
new TreeInstance()
{
color = Color.white,
heightScale = 1f,
lightmapColor = Color.white,
position = new float3(pos.x, height / maxHeight, pos.y),
prototypeIndex = i,
widthScale = 1f
}
);
}
}
}
}
terrainData.treeInstances = treeInstances.ToArray();
terrain.treeDistance = size;
}
float[,] GetHeightmap(int res, float size)
{
float[,] heghts = new float[res, res];
for (int i = 0; i < res; i++)
{
for (int j = 0; j < res; j++)
{
float2 pos = new float2(1f * i / size, 1f * j / size);
heghts[i, j] = NoiseExtensions.SNoise(pos, 1f, 2f, 0.5f, 6, 1f, new float2(0, 0));
}
}
return(heghts);
}
void Generate()
{
// Settings
int res = 512;
float size = 10000f;
float maxHeight = size / 10f;
float perlinSize = 500f;
// TerrainData
TerrainData terrainData = new TerrainData();
terrainData.name = "Terrain";
terrainData.heightmapResolution = res;
terrainData.alphamapResolution = res;
terrainData.size = new Vector3(size, maxHeight, size);
// Terrain GameObject
GameObject terrainGameObject = Terrain.CreateTerrainGameObject(terrainData);
terrainGameObject.transform.position = new Vector3(-size / 2f, 0f, -size / 2f);
Terrain terrain = terrainGameObject.GetComponent <Terrain>();
terrain.drawInstanced = true;
terrainGameObject.name = "Terrain";
// Heightmap
terrainData.SetHeights(0, 0, GetHeightmap(res + 1, perlinSize));
// Textures
TerrainLayer[] layerPrototypes = new TerrainLayer[1]
{
new TerrainLayer()
{
diffuseTexture = diffuseMap,
normalMapTexture = normalMap
}
};
terrainData.terrainLayers = layerPrototypes;
// Materials
terrain.materialTemplate = terrainMaterial;
// Tree prototypes
TreePrototype[] treePrototypes = new TreePrototype[treePrefabs.Length];
for (int i = 0; i < treePrototypes.Length; i++)
{
treePrototypes[i] = new TreePrototype
{
prefab = treePrefabs[i],
bendFactor = 0.1f
};
}
terrainData.treePrototypes = treePrototypes;
// Tree instances
List <TreeInstance> treeInstances = new List <TreeInstance>();
Unity.Mathematics.Random random = new Unity.Mathematics.Random(1);
for (int i = 0; i < treePrefabs.Length; i++)
{
for (int j = 0; j < nTrees; j++)
{
float2 pos = random.NextFloat2();
float treeBiome = NoiseExtensions.SNoise(pos, 1f, 2f, 0.5f, 1, 5f, new float2(10000, 0));
if (treeBiome < 0.8f)
{
float height = terrain.SampleHeight(new Vector3((pos.x - 0.5f) * size, 0f, (pos.y - 0.5f) * size));
if (height > 337f)
{
treeInstances.Add(
new TreeInstance
{
color = Color.white,
heightScale = 1f,
lightmapColor = Color.white,
position = new Vector3(pos.x, height / maxHeight, pos.y),
prototypeIndex = i,
widthScale = 1f
}
);
}
}
}
}
terrainData.treeInstances = treeInstances.ToArray();
// Terrain properties
terrain.treeDistance = size;
terrain.basemapDistance = size / 2f;
if (CameraController.active != null)
{
CameraController.active.terrain = terrain;
}
}