public void SpawnGrass(GrassPrefab item)
{
if (item.collisionCheck)
{
RebuildCollisionCacheIfNeeded();
}
item.instanceCount = 0;
foreach (Terrain terrain in terrains)
{
//2 texels per unit
//int density = Mathf.NextPowerOfTwo(Mathf.RoundToInt(terrain.terrainData.size.x * 2f));
//int[,] map = new int[density, density];
//terrain.terrainData.SetDetailResolution(density, terrain.terrainData.detailResolutionPerPatch);
#if UNITY_EDITOR
//UnityEditor.EditorUtility.DisplayProgressBar("Vegetation Spawner", "Spawning grass...", 1f);
#endif
int[,] map = terrain.terrainData.GetDetailLayer(0, 0, terrain.terrainData.detailWidth, terrain.terrainData.detailHeight, item.index);
for (int x = 0; x < terrain.terrainData.detailWidth; x++)
{
for (int y = 0; y < terrain.terrainData.detailHeight; y++)
{
InitializeSeed(x * y + item.seed);
//Default
int instanceCount = 1;
map[x, y] = 0;
//XZ world position
Vector3 wPos = terrain.DetailToWorld(y, x);
Vector2 normalizedPos = terrain.GetNormalizedPosition(wPos);
if (item.collisionCheck)
{
//Check for collision
if (InsideOccupiedCell(terrain, wPos, normalizedPos))
{
continue;
}
/* 1 second slower
* RaycastHit hit;
* if (Physics.Raycast(wPos + (Vector3.up * 50f), -Vector3.up, out hit, 100f, -1))
* {
* if (hit.collider.gameObject != terrain.gameObject)
* {
* continue;
* }
* }
*/
}
//Skip if failing probability check
if (((Random.value * 100f) <= item.probability) == false)
{
instanceCount = 0;
continue;
}
terrain.SampleHeight(normalizedPos, out _, out wPos.y, out _);
if (item.rejectUnderwater && wPos.y < waterHeight)
{
instanceCount = 0;
continue;
}
//Check height
if (wPos.y < item.heightRange.x || wPos.y > item.heightRange.y)
{
instanceCount = 0;
continue;
}
if (item.slopeRange.x > 0 || item.slopeRange.y < 90)
{
float slope = terrain.GetSlope(normalizedPos);
//Reject if slope check fails
if (slope < item.slopeRange.x || slope > item.slopeRange.y)
{
instanceCount = 0;
continue;
}
}
if (item.curvatureRange.x > 0 || item.curvatureRange.y < 1f)
{
float curvature = terrain.SampleConvexity(normalizedPos);
//0=concave, 0.5=flat, 1=convex
curvature = TerrainSampler.ConvexityToCurvature(curvature);
if (curvature < item.curvatureRange.x || curvature > item.curvatureRange.y)
{
instanceCount = 0;
continue;
}
}
//Reject based on layer masks
float spawnChance = 0f;
Vector2Int texelIndex = terrain.SplatmapTexelIndex(normalizedPos);
if (item.layerMasks.Count == 0)
{
spawnChance = 100f;
}
foreach (TerrainLayerMask layer in item.layerMasks)
{
Texture2D splat = terrain.terrainData.GetAlphamapTexture(GetSplatmapID(layer.layerID));
Color color = splat.GetPixel(texelIndex.x, texelIndex.y);
int channel = layer.layerID % 4;
float value = SampleChannel(color, channel);
if (value > 0)
{
value = Mathf.Clamp01(value - layer.threshold);
}
value *= 100f;
spawnChance += value;
}
InitializeSeed(x * y + item.seed);
if ((Random.value <= spawnChance) == false)
{
instanceCount = 0;
}
//if (instanceCount == 1) DebugPoints.Add(wPos, true, sampler.slope);
item.instanceCount += instanceCount;
//Passed all conditions, spawn one instance here
map[x, y] = instanceCount;
}
}
terrain.terrainData.SetDetailLayer(0, 0, item.index, map);
#if UNITY_EDITOR
UnityEditor.EditorUtility.ClearProgressBar();
#endif
}
onGrassRespawn?.Invoke(item);
}
public void SpawnTree(TreeType item)
{
if (item.collisionCheck)
{
RebuildCollisionCacheIfNeeded();
}
item.instanceCount = 0;
RefreshTreePrefabs();
float height, worldHeight, normalizedHeight;
foreach (Terrain terrain in terrains)
{
List <TreeInstance> treeInstanceCollection = new List <TreeInstance>(terrain.terrainData.treeInstances);
//Clear all existing instances first
for (int i = 0; i < treeInstanceCollection.Count; i++)
{
foreach (TreePrefab prefab in item.prefabs)
{
treeInstanceCollection.RemoveAll(x => x.prototypeIndex == prefab.index);
}
}
InitializeSeed(item.seed);
item.spawnPoints = PoissonDisc.GetSpawnpoints(terrain, item.distance, item.seed + seed);
foreach (Vector3 pos in item.spawnPoints)
{
//InitializeSeed(item.seed + index);
//Relative position as 0-1 value
Vector2 normalizedPos = terrain.GetNormalizedPosition(pos);
if (item.collisionCheck)
{
//Check for collision
if (InsideOccupiedCell(terrain, pos, normalizedPos))
{
continue;
}
}
InitializeSeed(item.seed + (int)pos.x + (int)pos.z);
//Skip if failing global probability check
if (((Random.value * 100f) <= item.probability) == false)
{
continue;
}
TreePrefab prefab = SpawnerBase.GetProbableTree(item);
//Failed probability checks entirely
if (prefab == null)
{
continue;
}
terrain.SampleHeight(normalizedPos, out height, out worldHeight, out normalizedHeight);
if (item.rejectUnderwater && worldHeight < waterHeight)
{
continue;
}
//Check height
if (worldHeight < item.heightRange.x || worldHeight > item.heightRange.y)
{
continue;
}
if (item.slopeRange.x > 0 || item.slopeRange.y < 90f)
{
float slope = terrain.GetSlope(normalizedPos, false);
//Reject if slope check fails
if (!(slope >= (item.slopeRange.x + 0.001f) && slope <= (item.slopeRange.y)))
{
continue;
}
}
if (item.curvatureRange.x > 0 || item.curvatureRange.y < 1f)
{
float curvature = terrain.SampleConvexity(normalizedPos);
//0=concave, 0.5=flat, 1=convex
curvature = TerrainSampler.ConvexityToCurvature(curvature);
if (curvature < item.curvatureRange.x || curvature > item.curvatureRange.y)
{
continue;
}
}
//Reject based on layer masks
Vector2Int texelIndex = terrain.SplatmapTexelIndex(normalizedPos);
float spawnChance = 0f;
if (item.layerMasks.Count == 0)
{
spawnChance = 100f;
}
foreach (TerrainLayerMask layer in item.layerMasks)
{
Texture2D splat = terrain.terrainData.GetAlphamapTexture(GetSplatmapID(layer.layerID));
Color color = splat.GetPixel(texelIndex.x, texelIndex.y);
int channel = layer.layerID % 4;
float value = SampleChannel(color, channel);
if (value > 0)
{
value = Mathf.Clamp01(value - layer.threshold);
}
value *= 100f;
spawnChance += value;
}
InitializeSeed((int)pos.x * (int)pos.z);
if ((Random.value <= spawnChance) == false)
{
continue;
}
//Passed all conditions, add instance
TreeInstance treeInstance = new TreeInstance();
treeInstance.prototypeIndex = prefab.index;
treeInstance.position = new Vector3(normalizedPos.x, normalizedHeight, normalizedPos.y);
treeInstance.rotation = Random.Range(0f, 359f) * Mathf.Deg2Rad;
float scale = Random.Range(item.scaleRange.x, item.scaleRange.y);
treeInstance.heightScale = scale;
treeInstance.widthScale = scale;
treeInstance.color = Color.white;
treeInstance.lightmapColor = Color.white;
treeInstanceCollection.Add(treeInstance);
item.instanceCount++;
}
item.spawnPoints.Clear();
#if UNITY_2019_1_OR_NEWER
terrain.terrainData.SetTreeInstances(treeInstanceCollection.ToArray(), false);
#else
terrain.terrainData.treeInstances = treeInstanceCollection.ToArray();
#endif
}
for (int i = 0; i < item.prefabs.Count; i++)
{
onTreeRespawn?.Invoke(item.prefabs[i]);
}
}
