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 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 and store it in our cache. Note that this overwrites existing TerrainData in our cache // because the workflow is such that attributes will always override local setting. string bakedTerrainPath = houdiniAsset.GetValidAssetCacheFolderPath(); bakedTerrainPath = HEU_Platform.BuildPath(bakedTerrainPath, 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); } } } // 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); if (!bResult || terrainData == null) { return; } if (_terrainData != terrainData) { _terrainData = terrainData; heightLayer._part.SetTerrainData(terrainData, relativeFolderPath); } 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[]> heightFields = new List<float[]>(); // Corresponding list of HF volume layers to process as splatmaps List<HEU_VolumeLayer> volumeLayersToProcess = new List<HEU_VolumeLayer>(); 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. for(int i = 1; i < numLayers; ++i) { float[] normalizedHF = HEU_TerrainUtility.GetNormalizedHeightmapFromPartWithMinMax(session, _ownerNode.GeoID, _layers[i]._part.PartID, _layers[i]._xLength, _layers[i]._yLength, ref minHeight, ref maxHeight, ref heightRange); if (normalizedHF != null && normalizedHF.Length > 0) { heightFields.Add(normalizedHF); volumeLayersToProcess.Add(_layers[i]); } } int numVolumeLayers = volumeLayersToProcess.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 < numVolumeLayers; ++m) { bNewTerrainLayer = false; bSetTerrainLayerProperties = true; layer = volumeLayersToProcess[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 < numVolumeLayers; ++m) { bNewSplat = false; layer = volumeLayersToProcess[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 && volumeLayersToProcess.Count > 0) { // Convert the heightfields into alpha maps with layer strengths float[] strengths = new float[volumeLayersToProcess.Count]; for (int m = 0; m < volumeLayersToProcess.Count; ++m) { strengths[m] = volumeLayersToProcess[m]._strength; } alphamap = HEU_TerrainUtility.AppendConvertedHeightFieldToAlphaMap( volumeLayersToProcess[0]._xLength, volumeLayersToProcess[0]._yLength, existingAlphaMaps, heightFields, 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 = volumeLayersToProcess[0]._xLength; terrainData.alphamapResolution = alphamapResolution; terrainData.SetAlphamaps(0, 0, alphamap); } // Tree instances for scattering HEU_TerrainUtility.ApplyScatter(terrainData, _scatterTrees); // 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(); }
public bool GenerateTerrainBuffers(HEU_SessionBase session, HAPI_NodeId nodeID, List<HAPI_PartInfo> volumeParts, List<HAPI_PartInfo> scatterInstancerParts, out List<HEU_LoadBufferVolume> volumeBuffers) { volumeBuffers = null; if (volumeParts.Count == 0) { return true; } volumeBuffers = new List<HEU_LoadBufferVolume>(); int numParts = volumeParts.Count; for (int i = 0; i < numParts; ++i) { HAPI_VolumeInfo volumeInfo = new HAPI_VolumeInfo(); bool bResult = session.GetVolumeInfo(nodeID, volumeParts[i].id, ref volumeInfo); if (!bResult || volumeInfo.tupleSize != 1 || volumeInfo.zLength != 1 || volumeInfo.storage != HAPI_StorageType.HAPI_STORAGETYPE_FLOAT) { SetLog(HEU_LoadData.LoadStatus.ERROR, "This heightfield is not supported. Please check documentation."); return false; } if (volumeInfo.xLength != volumeInfo.yLength) { SetLog(HEU_LoadData.LoadStatus.ERROR, "Non-square sized terrain not supported."); return false; } string volumeName = HEU_SessionManager.GetString(volumeInfo.nameSH, session); bool bHeightPart = volumeName.Equals(HEU_Defines.HAPI_HEIGHTFIELD_LAYERNAME_HEIGHT); bool bMaskPart = volumeName.Equals(HEU_Defines.HAPI_HEIGHTFIELD_LAYERNAME_MASK); //Debug.LogFormat("Part name: {0}, GeoName: {1}, Volume Name: {2}, Display: {3}", part.PartName, geoNode.GeoName, volumeName, geoNode.Displayable); // Ignoring mask layer because it is Houdini-specific (same behaviour as regular HDA terrain generation) if (bMaskPart) { continue; } HEU_LoadBufferVolumeLayer layer = new HEU_LoadBufferVolumeLayer(); layer._layerName = volumeName; layer._partID = volumeParts[i].id; layer._heightMapWidth = volumeInfo.xLength; layer._heightMapHeight = volumeInfo.yLength; Matrix4x4 volumeTransformMatrix = HEU_HAPIUtility.GetMatrixFromHAPITransform(ref volumeInfo.transform, false); layer._position = HEU_HAPIUtility.GetPosition(ref volumeTransformMatrix); Vector3 scale = HEU_HAPIUtility.GetScale(ref volumeTransformMatrix); // Calculate real terrain size in both Houdini and Unity. // The height values will be mapped over this terrain size. float gridSpacingX = scale.x * 2f; float gridSpacingY = scale.y * 2f; layer._terrainSizeX = Mathf.Round((volumeInfo.xLength - 1) * gridSpacingX); layer._terrainSizeY = Mathf.Round((volumeInfo.yLength - 1) * gridSpacingY); // Get volume bounds for calculating position offset session.GetVolumeBounds(nodeID, volumeParts[i].id, out layer._minBounds.x, out layer._minBounds.y, out layer._minBounds.z, out layer._maxBounds.x, out layer._maxBounds.y, out layer._maxBounds.z, out layer._center.x, out layer._center.y, out layer._center.z); // Look up TerrainLayer file via attribute if user has set it layer._layerPath = HEU_GeneralUtility.GetAttributeStringValueSingle(session, nodeID, volumeParts[i].id, HEU_Defines.DEFAULT_UNITY_HEIGHTFIELD_TERRAINLAYER_FILE_ATTR, HAPI_AttributeOwner.HAPI_ATTROWNER_PRIM); LoadStringFromAttribute(session, nodeID, volumeParts[i].id, HEU_Defines.DEFAULT_UNITY_HEIGHTFIELD_TEXTURE_DIFFUSE_ATTR, ref layer._diffuseTexturePath); LoadStringFromAttribute(session, nodeID, volumeParts[i].id, HEU_Defines.DEFAULT_UNITY_HEIGHTFIELD_TEXTURE_MASK_ATTR, ref layer._maskTexturePath); LoadStringFromAttribute(session, nodeID, volumeParts[i].id, HEU_Defines.DEFAULT_UNITY_HEIGHTFIELD_TEXTURE_NORMAL_ATTR, ref layer._normalTexturePath); LoadFloatFromAttribute(session, nodeID, volumeParts[i].id, HEU_Defines.DEFAULT_UNITY_HEIGHTFIELD_NORMAL_SCALE_ATTR, ref layer._normalScale); LoadFloatFromAttribute(session, nodeID, volumeParts[i].id, HEU_Defines.DEFAULT_UNITY_HEIGHTFIELD_METALLIC_ATTR, ref layer._metallic); LoadFloatFromAttribute(session, nodeID, volumeParts[i].id, HEU_Defines.DEFAULT_UNITY_HEIGHTFIELD_SMOOTHNESS_ATTR, ref layer._smoothness); LoadLayerColorFromAttribute(session, nodeID, volumeParts[i].id, HEU_Defines.DEFAULT_UNITY_HEIGHTFIELD_SPECULAR_ATTR, ref layer._specularColor); LoadLayerVector2FromAttribute(session, nodeID, volumeParts[i].id, HEU_Defines.DEFAULT_UNITY_HEIGHTFIELD_TILE_OFFSET_ATTR, ref layer._tileOffset); LoadLayerVector2FromAttribute(session, nodeID, volumeParts[i].id, HEU_Defines.DEFAULT_UNITY_HEIGHTFIELD_TILE_SIZE_ATTR, ref layer._tileSize); // Get the height values from Houdini along with the min and max height range. layer._normalizedHeights = HEU_TerrainUtility.GetNormalizedHeightmapFromPartWithMinMax(_session, nodeID, volumeParts[i].id, volumeInfo.xLength, volumeInfo.yLength, ref layer._minHeight, ref layer._maxHeight, ref layer._heightRange); // Get the tile index, if it exists, for this part HAPI_AttributeInfo tileAttrInfo = new HAPI_AttributeInfo(); int[] tileAttrData = new int[0]; HEU_GeneralUtility.GetAttribute(session, nodeID, volumeParts[i].id, HEU_Defines.HAPI_HEIGHTFIELD_TILE_ATTR, ref tileAttrInfo, ref tileAttrData, session.GetAttributeIntData); int tileIndex = 0; if (tileAttrInfo.exists && tileAttrData.Length == 1) { tileIndex = tileAttrData[0]; } // Add layer based on tile index if (tileIndex >= 0) { HEU_LoadBufferVolume volumeBuffer = null; for(int j = 0; j < volumeBuffers.Count; ++j) { if (volumeBuffers[j]._tileIndex == tileIndex) { volumeBuffer = volumeBuffers[j]; break; } } if (volumeBuffer == null) { volumeBuffer = new HEU_LoadBufferVolume(); volumeBuffer.InitializeBuffer(volumeParts[i].id, volumeName, false, false); volumeBuffer._tileIndex = tileIndex; volumeBuffers.Add(volumeBuffer); } if (bHeightPart) { // Height layer always first layer volumeBuffer._layers.Insert(0, layer); volumeBuffer._heightMapWidth = layer._heightMapWidth; volumeBuffer._heightMapHeight = layer._heightMapHeight; volumeBuffer._terrainSizeX = layer._terrainSizeX; volumeBuffer._terrainSizeY = layer._terrainSizeY; volumeBuffer._heightRange = (layer._maxHeight - layer._minHeight); // Look up TerrainData file path via attribute if user has set it volumeBuffer._terrainDataPath = HEU_GeneralUtility.GetAttributeStringValueSingle(session, nodeID, volumeBuffer._id, HEU_Defines.DEFAULT_UNITY_HEIGHTFIELD_TERRAINDATA_FILE_ATTR, HAPI_AttributeOwner.HAPI_ATTROWNER_PRIM); // Load the TreePrototype buffers List<HEU_TreePrototypeInfo> treePrototypeInfos = HEU_TerrainUtility.GetTreePrototypeInfosFromPart(session, nodeID, volumeBuffer._id); if (treePrototypeInfos != null) { if (volumeBuffer._scatterTrees == null) { volumeBuffer._scatterTrees = new HEU_VolumeScatterTrees(); } volumeBuffer._scatterTrees._treePrototypInfos = treePrototypeInfos; } } else { volumeBuffer._layers.Add(layer); } } Sleep(); } // Each volume buffer is a self contained terrain tile foreach(HEU_LoadBufferVolume volumeBuffer in volumeBuffers) { List<HEU_LoadBufferVolumeLayer> layers = volumeBuffer._layers; //Debug.LogFormat("Heightfield: tile={0}, layers={1}", tile._tileIndex, layers.Count); int heightMapWidth = volumeBuffer._heightMapWidth; int heightMapHeight = volumeBuffer._heightMapHeight; int numLayers = layers.Count; if (numLayers > 0) { // Convert heightmap values from Houdini to Unity volumeBuffer._heightMap = HEU_TerrainUtility.ConvertHeightMapHoudiniToUnity(heightMapWidth, heightMapHeight, layers[0]._normalizedHeights); Sleep(); // Convert splatmap values from Houdini to Unity. // Start at 2nd index since height is strictly for height values (not splatmap). List<float[]> heightFields = new List<float[]>(); for(int m = 1; m < numLayers; ++m) { heightFields.Add(layers[m]._normalizedHeights); } // The number of maps are the number of splatmaps (ie. non height/mask layers) int numMaps = heightFields.Count; if (numMaps > 0) { // Using the first splatmap size for all splatmaps volumeBuffer._splatMaps = HEU_TerrainUtility.ConvertHeightFieldToAlphaMap(layers[1]._heightMapWidth, layers[1]._heightMapHeight, heightFields); } else { volumeBuffer._splatMaps = null; } volumeBuffer._position = new Vector3((volumeBuffer._terrainSizeX + volumeBuffer._layers[0]._minBounds.x), volumeBuffer._layers[0]._minHeight + volumeBuffer._layers[0]._position.y, volumeBuffer._layers[0]._minBounds.z); } } // Process the scatter instancer parts to get the scatter data for (int i = 0; i < scatterInstancerParts.Count; ++i) { // Find the terrain tile (use primitive attr). Assume 0 tile if not set (i.e. not split into tiles) int terrainTile = 0; HAPI_AttributeInfo tileAttrInfo = new HAPI_AttributeInfo(); int[] tileAttrData = new int[0]; if (HEU_GeneralUtility.GetAttribute(session, nodeID, scatterInstancerParts[i].id, HEU_Defines.HAPI_HEIGHTFIELD_TILE_ATTR, ref tileAttrInfo, ref tileAttrData, session.GetAttributeIntData)) { if (tileAttrData != null && tileAttrData.Length > 0) { terrainTile = tileAttrData[0]; } } // Find the volume layer associated with this part using the terrain tile index HEU_LoadBufferVolume volumeBuffer = GetLoadBufferVolumeFromTileIndex(terrainTile, volumeBuffers); if (volumeBuffer == null) { continue; } HEU_TerrainUtility.PopulateScatterInfo(session, nodeID, scatterInstancerParts[i].id, scatterInstancerParts[i].pointCount, ref volumeBuffer._scatterTrees); } return true; }