private void GenerateTerrain(List<HEU_LoadBufferVolume> terrainBuffers)
{
Transform parent = this.gameObject.transform;
// Directory to store generated terrain files.
string outputTerrainpath = GetOutputCacheDirectory();
outputTerrainpath = HEU_Platform.BuildPath(outputTerrainpath, "Terrain");
int numVolumes = terrainBuffers.Count;
for(int t = 0; t < numVolumes; ++t)
{
if (terrainBuffers[t]._heightMap != null)
{
GameObject newGameObject = new GameObject("heightfield_" + terrainBuffers[t]._tileIndex);
Transform newTransform = newGameObject.transform;
newTransform.parent = parent;
HEU_GeneratedOutput generatedOutput = new HEU_GeneratedOutput();
generatedOutput._outputData._gameObject = newGameObject;
Terrain terrain = HEU_GeneralUtility.GetOrCreateComponent<Terrain>(newGameObject);
TerrainCollider collider = HEU_GeneralUtility.GetOrCreateComponent<TerrainCollider>(newGameObject);
if (!string.IsNullOrEmpty(terrainBuffers[t]._terrainDataPath))
{
// Load the source TerrainData, then make a unique copy of it in the cache folder
TerrainData sourceTerrainData = HEU_AssetDatabase.LoadAssetAtPath(terrainBuffers[t]._terrainDataPath, typeof(TerrainData)) as TerrainData;
if (sourceTerrainData == null)
{
Debug.LogWarningFormat("TerrainData, set via attribute, not found at: {0}", terrainBuffers[t]._terrainDataPath);
}
terrain.terrainData = HEU_AssetDatabase.CopyUniqueAndLoadAssetAtAnyPath(sourceTerrainData, outputTerrainpath, typeof(TerrainData)) as TerrainData;
if (terrain.terrainData != null)
{
// Store path so that it can be deleted on clean up
AddGeneratedOutputFilePath(HEU_AssetDatabase.GetAssetPath(terrain.terrainData));
}
}
if (terrain.terrainData == null)
{
terrain.terrainData = new TerrainData();
}
TerrainData terrainData = terrain.terrainData;
collider.terrainData = terrainData;
HEU_TerrainUtility.SetTerrainMaterial(terrain, terrainBuffers[t]._specifiedTerrainMaterialName);
#if UNITY_2018_3_OR_NEWER
terrain.allowAutoConnect = true;
// This has to be set after setting material
terrain.drawInstanced = true;
#endif
int heightMapSize = terrainBuffers[t]._heightMapWidth;
terrainData.heightmapResolution = heightMapSize;
if (terrainData.heightmapResolution != heightMapSize)
{
Debug.LogErrorFormat("Unsupported terrain size: {0}", heightMapSize);
continue;
}
// The terrainData.baseMapResolution is not set here, but rather left to whatever default Unity uses
// The terrainData.alphamapResolution is set later when setting the alphamaps.
// 32 is the default for resolutionPerPatch
const int detailResolution = 1024;
const int resolutionPerPatch = 32;
terrainData.SetDetailResolution(detailResolution, resolutionPerPatch);
terrainData.SetHeights(0, 0, terrainBuffers[t]._heightMap);
// Note that Unity uses a default height range of 600 when a flat terrain is created.
// Without a non-zero value for the height range, user isn't able to draw heights.
// Therefore, set 600 as the value if height range is currently 0 (due to flat heightfield).
float heightRange = terrainBuffers[t]._heightRange;
if (heightRange == 0)
{
heightRange = 600;
}
terrainData.size = new Vector3(terrainBuffers[t]._terrainSizeX, heightRange, terrainBuffers[t]._terrainSizeY);
terrain.Flush();
// Set position
HAPI_Transform hapiTransformVolume = new HAPI_Transform(true);
hapiTransformVolume.position[0] += terrainBuffers[t]._position[0];
hapiTransformVolume.position[1] += terrainBuffers[t]._position[1];
hapiTransformVolume.position[2] += terrainBuffers[t]._position[2];
HEU_HAPIUtility.ApplyLocalTransfromFromHoudiniToUnity(ref hapiTransformVolume, newTransform);
// Set layers
Texture2D defaultTexture = HEU_VolumeCache.LoadDefaultSplatTexture();
int numLayers = terrainBuffers[t]._splatLayers.Count;
#if UNITY_2018_3_OR_NEWER
// Create TerrainLayer for each heightfield layer.
// Note that height and mask layers are ignored (i.e. not created as TerrainLayers).
// Since height layer is first, only process layers from 2nd index onwards.
if (numLayers > 1)
{
// Keep existing TerrainLayers, and either update or append to them
TerrainLayer[] existingTerrainLayers = terrainData.terrainLayers;
// Total layers are existing layers + new alpha maps
List<TerrainLayer> finalTerrainLayers = new List<TerrainLayer>(existingTerrainLayers);
for (int m = 1; m < numLayers; ++m)
{
TerrainLayer terrainlayer = null;
int terrainLayerIndex = -1;
bool bSetTerrainLayerProperties = true;
HEU_LoadBufferVolumeLayer layer = terrainBuffers[t]._splatLayers[m];
// Look up TerrainLayer file via attribute if user has set it
if (!string.IsNullOrEmpty(layer._layerPath))
{
terrainlayer = HEU_AssetDatabase.LoadAssetAtPath(layer._layerPath, typeof(TerrainLayer)) as TerrainLayer;
if (terrainlayer == null)
{
Debug.LogWarningFormat("TerrainLayer, set via attribute, not found at: {0}", layer._layerPath);
continue;
}
else
{
// Always check if its part of existing list so as not to add it again
terrainLayerIndex = HEU_TerrainUtility.GetTerrainLayerIndex(terrainlayer, existingTerrainLayers);
}
}
if (terrainlayer == null)
{
terrainlayer = new TerrainLayer();
terrainLayerIndex = finalTerrainLayers.Count;
finalTerrainLayers.Add(terrainlayer);
}
else
{
// For existing TerrainLayer, make a copy of it if it has custom layer attributes
// because we don't want to change the original TerrainLayer.
if (layer._hasLayerAttributes && terrainLayerIndex >= 0)
{
// Copy the TerrainLayer file
TerrainLayer prevTerrainLayer = terrainlayer;
terrainlayer = HEU_AssetDatabase.CopyAndLoadAssetAtAnyPath(terrainlayer, outputTerrainpath, typeof(TerrainLayer), true) as TerrainLayer;
if (terrainlayer != null)
{
// Update the TerrainLayer reference in the list with this copy
finalTerrainLayers[terrainLayerIndex] = terrainlayer;
// Store path for clean up later
AddGeneratedOutputFilePath(HEU_AssetDatabase.GetAssetPath(terrainlayer));
}
else
{
Debug.LogErrorFormat("Unable to copy TerrainLayer '{0}' for generating Terrain. "
+ "Using original TerrainLayer. Will not be able to set any TerrainLayer properties.", layer._layerName);
terrainlayer = prevTerrainLayer;
bSetTerrainLayerProperties = false;
// Again, continuing on to keep proper indexing.
}
}
}
if (bSetTerrainLayerProperties)
{
if (!string.IsNullOrEmpty(layer._diffuseTexturePath))
{
terrainlayer.diffuseTexture = HEU_MaterialFactory.LoadTexture(layer._diffuseTexturePath);
}
if (terrainlayer.diffuseTexture == null)
{
terrainlayer.diffuseTexture = defaultTexture;
}
terrainlayer.diffuseRemapMin = Vector4.zero;
terrainlayer.diffuseRemapMax = Vector4.one;
if (!string.IsNullOrEmpty(layer._maskTexturePath))
{
terrainlayer.maskMapTexture = HEU_MaterialFactory.LoadTexture(layer._maskTexturePath);
}
terrainlayer.maskMapRemapMin = Vector4.zero;
terrainlayer.maskMapRemapMax = Vector4.one;
terrainlayer.metallic = layer._metallic;
if (!string.IsNullOrEmpty(layer._normalTexturePath))
{
terrainlayer.normalMapTexture = HEU_MaterialFactory.LoadTexture(layer._normalTexturePath);
}
terrainlayer.normalScale = layer._normalScale;
terrainlayer.smoothness = layer._smoothness;
terrainlayer.specular = layer._specularColor;
terrainlayer.tileOffset = layer._tileOffset;
if (layer._tileSize.magnitude == 0f && terrainlayer.diffuseTexture != null)
{
// Use texture size if tile size is 0
layer._tileSize = new Vector2(terrainlayer.diffuseTexture.width, terrainlayer.diffuseTexture.height);
}
terrainlayer.tileSize = layer._tileSize;
}
}
terrainData.terrainLayers = finalTerrainLayers.ToArray();
}
#else
// Need to create SplatPrototype for each layer in heightfield, representing the textures.
SplatPrototype[] splatPrototypes = new SplatPrototype[numLayers];
for (int m = 0; m < numLayers; ++m)
{
splatPrototypes[m] = new SplatPrototype();
HEU_LoadBufferVolumeLayer layer = terrainBuffers[t]._splatLayers[m];
Texture2D diffuseTexture = null;
if (!string.IsNullOrEmpty(layer._diffuseTexturePath))
{
diffuseTexture = HEU_MaterialFactory.LoadTexture(layer._diffuseTexturePath);
}
if (diffuseTexture == null)
{
diffuseTexture = defaultTexture;
}
splatPrototypes[m].texture = diffuseTexture;
splatPrototypes[m].tileOffset = layer._tileOffset;
if (layer._tileSize.magnitude == 0f && diffuseTexture != null)
{
// Use texture size if tile size is 0
layer._tileSize = new Vector2(diffuseTexture.width, diffuseTexture.height);
}
splatPrototypes[m].tileSize = layer._tileSize;
splatPrototypes[m].metallic = layer._metallic;
splatPrototypes[m].smoothness = layer._smoothness;
if (!string.IsNullOrEmpty(layer._normalTexturePath))
{
splatPrototypes[m].normalMap = HEU_MaterialFactory.LoadTexture(layer._normalTexturePath);
}
}
terrainData.splatPrototypes = splatPrototypes;
#endif
// Set the splatmaps
if (terrainBuffers[t]._splatMaps != null)
{
// Set the alphamap size before setting the alphamaps to get correct scaling
// The alphamap size comes from the first alphamap layer
int alphamapResolution = terrainBuffers[t]._heightMapWidth;
if (numLayers > 1)
{
alphamapResolution = terrainBuffers[t]._splatLayers[1]._heightMapWidth;
}
terrainData.alphamapResolution = alphamapResolution;
terrainData.SetAlphamaps(0, 0, terrainBuffers[t]._splatMaps);
}
// Set the tree scattering
if (terrainBuffers[t]._scatterTrees != null)
{
HEU_TerrainUtility.ApplyScatterTrees(terrainData, terrainBuffers[t]._scatterTrees);
}
// Set the detail layers
if (terrainBuffers[t]._detailPrototypes != null)
{
HEU_TerrainUtility.ApplyDetailLayers(terrain, terrainData, terrainBuffers[t]._detailProperties,
terrainBuffers[t]._detailPrototypes, terrainBuffers[t]._detailMaps);
}
terrainBuffers[t]._generatedOutput = generatedOutput;
_generatedOutputs.Add(generatedOutput);
SetOutputVisiblity(terrainBuffers[t]);
}
}
}
public void GenerateTerrainWithAlphamaps(HEU_SessionBase session, HEU_HoudiniAsset houdiniAsset, bool bRebuild)
{
if (_layers == null || _layers.Count == 0)
{
Debug.LogError("Unable to generate terrain due to lack of heightfield layers!");
return;
}
HEU_VolumeLayer heightLayer = _layers[0];
HAPI_VolumeInfo heightVolumeInfo = new HAPI_VolumeInfo();
bool bResult = session.GetVolumeInfo(_ownerNode.GeoID, heightLayer._part.PartID, ref heightVolumeInfo);
if (!bResult)
{
Debug.LogErrorFormat("Unable to get volume info for height layer: {0}!", heightLayer._layerName);
return;
}
// Special handling of volume cache presets. It is applied here (if exists) because it might pertain to TerrainData that exists
// in the AssetDatabase. If we don't apply here but rather create a new one, the existing file will get overwritten.
// Applying the preset here for terrain ensures the TerrainData is reused.
// Get the volume preset for this part
HEU_VolumeCachePreset volumeCachePreset = houdiniAsset.GetVolumeCachePreset(_ownerNode.ObjectNode.ObjectName, _ownerNode.GeoName, TileIndex);
if (volumeCachePreset != null)
{
ApplyPreset(volumeCachePreset);
// Remove it so that it doesn't get applied when doing the recook step
houdiniAsset.RemoveVolumeCachePreset(volumeCachePreset);
}
// The TerrainData and TerrainLayer files needs to be saved out if we create them. This creates the relative folder
// path from the Asset's cache folder: {assetCache}/{geo name}/Terrain/Tile{tileIndex}/...
string relativeFolderPath = HEU_Platform.BuildPath(_ownerNode.GeoName, HEU_Defines.HEU_FOLDER_TERRAIN, HEU_Defines.HEU_FOLDER_TILE + TileIndex);
if (bRebuild)
{
// For full rebuild, re-create the TerrainData instead of using previous
_terrainData = null;
}
//Debug.Log("Generating Terrain with AlphaMaps: " + (_terrainData != null ? _terrainData.name : "NONE"));
TerrainData terrainData = _terrainData;
Vector3 terrainOffsetPosition = Vector3.zero;
// Look up TerrainData export file path via attribute if user has set it
string userTerrainDataExportPath = HEU_GeneralUtility.GetAttributeStringValueSingle(session, _ownerNode.GeoID, heightLayer._part.PartID,
HEU_Defines.DEFAULT_UNITY_HEIGHTFIELD_TERRAINDATA_EXPORT_FILE_ATTR, HAPI_AttributeOwner.HAPI_ATTROWNER_PRIM);
// Look up TerrainData file via attribute if user has set it
string terrainDataFile = HEU_GeneralUtility.GetAttributeStringValueSingle(session, _ownerNode.GeoID, heightLayer._part.PartID,
HEU_Defines.DEFAULT_UNITY_HEIGHTFIELD_TERRAINDATA_FILE_ATTR, HAPI_AttributeOwner.HAPI_ATTROWNER_PRIM);
if (!string.IsNullOrEmpty(terrainDataFile))
{
TerrainData loadedTerrainData = HEU_AssetDatabase.LoadAssetAtPath(terrainDataFile, typeof(TerrainData)) as TerrainData;
if (loadedTerrainData == null)
{
Debug.LogWarningFormat("TerrainData, set via attribute, not found at: {0}", terrainDataFile);
}
else
{
// In the case that the specified TerrainData belongs to another Terrain (i.e. input Terrain), make a copy of it.
if (!string.IsNullOrEmpty(userTerrainDataExportPath))
{
// Save it to explicit path specified by user
terrainData = HEU_AssetDatabase.CopyAndLoadAssetAtGivenPath(loadedTerrainData, userTerrainDataExportPath, typeof(TerrainData)) as TerrainData;
}
else
{
// Save it into cache
// Note that this overwrites existing TerrainData in our cache because the workflow is
// such that attributes will always override local setting.
string bakedTerrainPath = HEU_Platform.BuildPath(houdiniAsset.GetValidAssetCacheFolderPath(), relativeFolderPath);
terrainData = HEU_AssetDatabase.CopyAndLoadAssetAtAnyPath(loadedTerrainData, bakedTerrainPath, typeof(TerrainData), true) as TerrainData;
if (terrainData == null)
{
Debug.LogErrorFormat("Unable to copy TerrainData from {0} for generating Terrain.", terrainDataFile);
}
}
}
}
Terrain terrain = null;
// Generate the terrain and terrain data from the height layer. This applies height values.
bResult = HEU_TerrainUtility.GenerateTerrainFromVolume(session, ref heightVolumeInfo, heightLayer._part.ParentGeoNode.GeoID,
heightLayer._part.PartID, heightLayer._part.OutputGameObject, ref terrainData, out terrainOffsetPosition,
ref terrain);
if (!bResult || terrainData == null)
{
return;
}
if (_terrainData != terrainData)
{
_terrainData = terrainData;
heightLayer._part.SetTerrainData(terrainData, relativeFolderPath, userTerrainDataExportPath);
}
heightLayer._part.SetTerrainOffsetPosition(terrainOffsetPosition);
int terrainSize = terrainData.heightmapResolution;
// Now process TerrainLayers and alpha maps
// First, preprocess all layers to get heightfield arrays, converted to proper size
List<float[]> normalizedHeightfields = new List<float[]>();
// Corresponding list of HF volume layers to process as splatmaps
List<HEU_VolumeLayer> terrainLayersToProcess = new List<HEU_VolumeLayer>();
List<int[,]> convertedDetailMaps = new List<int[,]>();
List<HEU_DetailPrototype> detailPrototypes = new List<HEU_DetailPrototype>();
int numLayers = _layers.Count;
float minHeight = 0;
float maxHeight = 0;
float heightRange = 0;
// This skips the height layer, and processes all other layers.
// Note that mask shouldn't be part of _layers at this point.
// The layers are normalized and split into detail and terrain layers.
for (int i = 1; i < numLayers; ++i)
{
if (_layers[i]._layerType == HFLayerType.DETAIL)
{
if (_detailProperties == null)
{
_detailProperties = new HEU_DetailProperties();
}
// Convert to detail map, and add to list to set later
int[,] normalizedDetail = HEU_TerrainUtility.GetDetailMapFromPart(
session, _ownerNode.GeoID, _layers[i]._part.PartID, out _detailProperties._detailResolution);
if (normalizedDetail != null && normalizedDetail.Length > 0)
{
convertedDetailMaps.Add(normalizedDetail);
detailPrototypes.Add(_layers[i]._detailPrototype);
}
}
else
{
// Convert to normalized heightfield
float[] normalizedHF = HEU_TerrainUtility.GetNormalizedHeightmapFromPartWithMinMax(
session, _ownerNode.GeoID, _layers[i]._part.PartID, _layers[i]._xLength,
_layers[i]._yLength, ref minHeight, ref maxHeight, ref heightRange, false);
if (normalizedHF != null && normalizedHF.Length > 0)
{
normalizedHeightfields.Add(normalizedHF);
terrainLayersToProcess.Add(_layers[i]);
}
}
}
int numTerrainLayersToProcess = terrainLayersToProcess.Count;
HAPI_NodeId geoID;
HAPI_PartId partID;
Texture2D defaultTexture = LoadDefaultSplatTexture();
#if UNITY_2018_3_OR_NEWER
// Create or update the terrain layers based on heightfield layers.
// Keep existing TerrainLayers, and either update or append to them
TerrainLayer[] existingTerrainLayers = terrainData.terrainLayers;
// Total layers are existing layers + new alpha maps
List<TerrainLayer> finalTerrainLayers = new List<TerrainLayer>(existingTerrainLayers);
// This holds the alpha map indices for each layer that will be added to the TerrainData.
// The alpha maps could be a mix of existing and new values, so need to know which to use
// Initially set to use existing alpha maps, then override later on if specified via HF layers
List<int> alphaMapIndices = new List<int>();
for (int a = 0; a < existingTerrainLayers.Length; ++a)
{
// Negative indices for existing alpha map (offset by -1)
alphaMapIndices.Add(-a - 1);
}
bool bNewTerrainLayer = false;
HEU_VolumeLayer layer = null;
TerrainLayer terrainLayer = null;
bool bSetTerrainLayerProperties = true;
for (int m = 0; m < numTerrainLayersToProcess; ++m)
{
bNewTerrainLayer = false;
bSetTerrainLayerProperties = true;
layer = terrainLayersToProcess[m];
geoID = _ownerNode.GeoID;
partID = layer._part.PartID;
terrainLayer = null;
int terrainLayerIndex = -1;
// The TerrainLayer attribute overrides existing TerrainLayer. So if its set, load and use it.
string terrainLayerFile = HEU_GeneralUtility.GetAttributeStringValueSingle(session, geoID, partID,
HEU_Defines.DEFAULT_UNITY_HEIGHTFIELD_TERRAINLAYER_FILE_ATTR, HAPI_AttributeOwner.HAPI_ATTROWNER_PRIM);
if (!string.IsNullOrEmpty(terrainLayerFile))
{
terrainLayer = HEU_AssetDatabase.LoadAssetAtPath(terrainLayerFile, typeof(TerrainLayer)) as TerrainLayer;
if (terrainLayer == null)
{
Debug.LogWarningFormat("TerrainLayer, set via attribute, not found at: {0}", terrainLayerFile);
// Not earlying out or skipping this layer due to error because we want to keep proper indexing
// by creating a new TerrainLayer.
}
else
{
// TerrainLayer loaded from attribute.
// It could be an existing TerrainLayer that is already part of finalTerrainLayers
// or could be a new one which needs to be added.
// If its a different TerrainLayer than existing, update the finalTerrainLayers, and index.
if (layer._terrainLayer != null && layer._terrainLayer != terrainLayer)
{
terrainLayerIndex = HEU_TerrainUtility.GetTerrainLayerIndex(layer._terrainLayer, existingTerrainLayers);
if (terrainLayerIndex >= 0)
{
finalTerrainLayers[terrainLayerIndex] = terrainLayer;
}
}
if (terrainLayerIndex == -1)
{
// Always check if its part of existing list so as not to add it again
terrainLayerIndex = HEU_TerrainUtility.GetTerrainLayerIndex(terrainLayer, existingTerrainLayers);
}
}
}
// No terrain layer specified, so try using existing if we have it
if (terrainLayer == null)
{
terrainLayerIndex = HEU_TerrainUtility.GetTerrainLayerIndex(layer._terrainLayer, existingTerrainLayers);
if (terrainLayerIndex >= 0)
{
// Note the terrainLayerIndex is same for finalTerrainLayers as existingTerrainLayers
terrainLayer = existingTerrainLayers[terrainLayerIndex];
}
}
// Still not found, so just create a new one
if (terrainLayer == null)
{
terrainLayer = new TerrainLayer();
terrainLayer.name = layer._layerName;
//Debug.LogFormat("Created new TerrainLayer with name: {0} ", terrainLayer.name);
bNewTerrainLayer = true;
}
if (terrainLayerIndex == -1)
{
// Adding to the finalTerrainLayers if this is indeed a newly created or loaded TerrainLayer
// (i.e. isn't already part of the TerrainLayers for this Terrain).
// Save this layer's index for later on if we make a copy.
terrainLayerIndex = finalTerrainLayers.Count;
finalTerrainLayers.Add(terrainLayer);
// Positive index for alpha map from heightfield (starting at 1)
alphaMapIndices.Add(m + 1);
}
else
{
// Positive index for alpha map from heightfield (starting at 1)
alphaMapIndices[terrainLayerIndex] = m + 1;
}
// For existing TerrainLayer, make a copy of it if it has custom layer attributes
// because we don't want to change the original TerrainLayer.
if (!bNewTerrainLayer && layer._hasLayerAttributes)
{
string bakedTerrainPath = houdiniAsset.GetValidAssetCacheFolderPath();
bakedTerrainPath = HEU_Platform.BuildPath(bakedTerrainPath, relativeFolderPath);
TerrainLayer prevTerrainLayer = terrainLayer;
terrainLayer = HEU_AssetDatabase.CopyAndLoadAssetAtAnyPath(terrainLayer, bakedTerrainPath, typeof(TerrainLayer), true) as TerrainLayer;
if (terrainLayer != null)
{
// Update the TerrainLayer reference in the list with this copy
finalTerrainLayers[terrainLayerIndex] = terrainLayer;
}
else
{
Debug.LogErrorFormat("Unable to copy TerrainLayer '{0}' for generating Terrain. "
+ "Using original TerrainLayer. Will not be able to set any TerrainLayer properties.", layer._layerName);
terrainLayer = prevTerrainLayer;
bSetTerrainLayerProperties = false;
// Again, continuing on to keep proper indexing.
}
}
// Now override layer properties if they have been set via attributes
if (bSetTerrainLayerProperties)
{
LoadLayerPropertiesFromAttributes(session, geoID, partID, terrainLayer, bNewTerrainLayer, defaultTexture);
}
if (bNewTerrainLayer)
{
// In order to retain the new TerrainLayer, it must be saved to the AssetDatabase.
Object savedObject = null;
string layerFileNameWithExt = terrainLayer.name;
if (!layerFileNameWithExt.EndsWith(HEU_Defines.HEU_EXT_TERRAINLAYER))
{
layerFileNameWithExt += HEU_Defines.HEU_EXT_TERRAINLAYER;
}
houdiniAsset.AddToAssetDBCache(layerFileNameWithExt, terrainLayer, relativeFolderPath, ref savedObject);
}
// Store reference
layer._terrainLayer = terrainLayer;
}
// Get existing alpha maps so we can reuse the values if needed
float[,,] existingAlphaMaps = terrainData.GetAlphamaps(0, 0, terrainData.alphamapWidth, terrainData.alphamapHeight);
terrainData.terrainLayers = finalTerrainLayers.ToArray();
int numTotalAlphaMaps = finalTerrainLayers.Count;
#else
// Create or update the SplatPrototype based on heightfield layers.
// Need to create or reuse SplatPrototype for each layer in heightfield, representing the textures.
SplatPrototype[] existingSplats = terrainData.splatPrototypes;
// A full rebuild clears out existing splats, but a regular cook keeps them.
List<SplatPrototype> finalSplats = new List<SplatPrototype>(existingSplats);
// This holds the alpha map indices for each layer that will be added to the TerrainData
// The alpha maps could be a mix of existing and new values, so need to know which to use
List<int> alphaMapIndices = new List<int>();
// Initially set to use existing alpha maps, then override later on if specified via HF layers.
for (int a = 0; a < existingSplats.Length; ++a)
{
// Negative indices for existing alpha map (offset by -1)
alphaMapIndices.Add(-a - 1);
}
bool bNewSplat = false;
HEU_VolumeLayer layer = null;
SplatPrototype splatPrototype = null;
for (int m = 0; m < numTerrainLayersToProcess; ++m)
{
bNewSplat = false;
layer = terrainLayersToProcess[m];
geoID = _ownerNode.GeoID;
partID = layer._part.PartID;
// Try to find existing SplatPrototype for reuse. But not for full rebuild.
splatPrototype = null;
if (layer._splatPrototypeIndex >= 0 && layer._splatPrototypeIndex < existingSplats.Length)
{
splatPrototype = existingSplats[layer._splatPrototypeIndex];
// Positive index for alpha map from heightfield (starting at 1)
alphaMapIndices[layer._splatPrototypeIndex] = m + 1;
}
if (splatPrototype == null)
{
splatPrototype = new SplatPrototype();
layer._splatPrototypeIndex = finalSplats.Count;
finalSplats.Add(splatPrototype);
// Positive index for alpha map from heightfield (starting at 1)
alphaMapIndices.Add(m + 1);
}
// Now override splat properties if they have been set via attributes
LoadLayerPropertiesFromAttributes(session, geoID, partID, splatPrototype, bNewSplat, defaultTexture);
}
// On regular cook, get existing alpha maps so we can reuse the values if needed.
float[,,] existingAlphaMaps = terrainData.GetAlphamaps(0, 0, terrainData.alphamapWidth, terrainData.alphamapHeight);
terrainData.splatPrototypes = finalSplats.ToArray();
int numTotalAlphaMaps = finalSplats.Count;
#endif
// Set alpha maps by combining with existing alpha maps, and appending new heightfields
float[,,] alphamap = null;
if (numTotalAlphaMaps > 0 && terrainLayersToProcess.Count > 0)
{
// Convert the heightfields into alpha maps with layer strengths
float[] strengths = new float[terrainLayersToProcess.Count];
for (int m = 0; m < terrainLayersToProcess.Count; ++m)
{
strengths[m] = terrainLayersToProcess[m]._strength;
}
alphamap = HEU_TerrainUtility.AppendConvertedHeightFieldToAlphaMap(
terrainLayersToProcess[0]._xLength, terrainLayersToProcess[0]._yLength, existingAlphaMaps,
normalizedHeightfields, strengths, alphaMapIndices);
// Update the alphamap resolution to the actual size of the first
// heightfield layer used for the alphamaps.
// Setting the size before setting the alphamas applies proper scaling.
int alphamapResolution = terrainLayersToProcess[0]._xLength;
terrainData.alphamapResolution = alphamapResolution;
terrainData.SetAlphamaps(0, 0, alphamap);
}
// Scattering - trees and details
HEU_TerrainUtility.ApplyScatterTrees(terrainData, _scatterTrees);
HEU_TerrainUtility.ApplyDetailLayers(terrain, terrainData, _detailProperties, detailPrototypes, convertedDetailMaps);
// If the layers were writen out, this saves the asset DB. Otherwise user has to save it themselves.
// Not 100% sure this is needed, but without this the editor doesn't know the terrain asset has been updated
// and therefore doesn't import and show the terrain layer.
HEU_AssetDatabase.SaveAssetDatabase();
}