void UpdatePropLayer(TerrainImport terrainImport, TerrainImport.PropLayer layer)
{
var time = stopwatch.Elapsed;
var terrain = terrainImport.GetComponent <Terrain>();
var terrainData = terrain.terrainData;
if (layer.propSet == null)
{
return;
}
var instanceList = new List <TreeInstance>(terrainData.treeInstances);
foreach (var propData in layer.propSet.props)
{
sampler.Setup(new float2(terrainData.size.x, terrainData.size.z), Mathf.Min(propData.distanceStart, propData.distanceEnd));
if (layer.map != null)
{
float[,] mapData = new float[layer.map.width, layer.map.height];
ReadChannelFromTexture(layer.map, 0, ref mapData);
sampler.MapDesity(ref mapData, propData.minDensity, propData.maxDensity, propData.distanceStart, propData.distanceEnd);
}
sampler.Calculate();
var protoIndex = FindTreeProtoIndex(terrainData, propData.prefab);
if (protoIndex == -1)
{
var protoList = new List <TreePrototype>(terrainData.treePrototypes);
protoIndex = protoList.Count;
protoList.Add(new TreePrototype
{
prefab = propData.prefab
});
terrainData.treePrototypes = protoList.ToArray();
EditorUtility.SetDirty(terrainData);
EditorUtility.SetDirty(terrain);
}
for (int i = 0; i < sampler.propData.Count; i++)
{
var prop = sampler.propData[i];
var gridData = sampler.propGrid[prop.gridIndex];
var pos3D = new Vector3(prop.pos.x, 0, prop.pos.y);
var worldPos = terrainImport.transform.TransformPoint(pos3D);
var height = terrain.SampleHeight(worldPos);
var pos = new float3(sampler.propData[i].pos.x / terrainData.size.x, height / terrainData.size.y,
sampler.propData[i].pos.y / terrainData.size.z);
var densityFactor = 1.0f / (propData.maxDensity - propData.minDensity);
var scaleRange = propData.scaleEnd - propData.scaleStart;
var scale = propData.scaleStart + (gridData.density - propData.minDensity) * densityFactor * scaleRange;
scale = scale + Random.Range(0, scale * propData.scaleRandomFraction);
instanceList.Add(new TreeInstance
{
prototypeIndex = protoIndex,
widthScale = scale,
heightScale = scale,
rotation = Random.Range(0, 360),
color = propData.color,
lightmapColor = propData.lightmapColor,
position = pos
});
}
}
terrainData.treeInstances = instanceList.ToArray();
EditorUtility.SetDirty(terrainData);
EditorUtility.SetDirty(terrain);
GameDebug.Log("Prop layers applied [" + (stopwatch.Elapsed - time).Milliseconds + "ms]");
}