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 detailResolution = 0;
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)
{
AppendLog(HEU_LoadData.LoadStatus.ERROR, "This heightfield is not supported. Please check documentation.");
return false;
}
if (volumeInfo.xLength != volumeInfo.yLength)
{
AppendLog(HEU_LoadData.LoadStatus.ERROR, "Non-square sized terrain not supported.");
return false;
}
string volumeName = HEU_SessionManager.GetString(volumeInfo.nameSH, session);
HFLayerType layerType = HEU_TerrainUtility.GetHeightfieldLayerType(session, nodeID, volumeParts[i].id, volumeName);
//HEU_Logger.LogFormat("Index: {0}, Part id: {1}, Part Name: {2}, Volume Name: {3}", i, volumeParts[i].id, HEU_SessionManager.GetString(volumeParts[i].nameSH), volumeName);
// Ignoring mask layer because it is Houdini-specific (same behaviour as regular HDA terrain generation)
if (layerType == HFLayerType.MASK)
{
continue;
}
HEU_LoadBufferVolumeLayer layer = new HEU_LoadBufferVolumeLayer();
layer._layerName = volumeName;
layer._partID = volumeParts[i].id;
layer._heightMapWidth = volumeInfo.xLength;
layer._heightMapHeight = volumeInfo.yLength;
layer._layerType = layerType;
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.GetAttributeStringValueSingleStrict(session, nodeID, volumeParts[i].id,
HEU_Defines.DEFAULT_UNITY_HEIGHTFIELD_TERRAINLAYER_FILE_ATTR, HAPI_AttributeOwner.HAPI_ATTROWNER_PRIM);
if (layerType != HFLayerType.DETAIL)
{
layer._hasLayerAttributes = HEU_TerrainUtility.VolumeLayerHasAttributes(session, nodeID, volumeParts[i].id);
if (layer._hasLayerAttributes)
{
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,
(layerType == HFLayerType.HEIGHT));
}
// Get the tile index, if it exists, for this part
int tileIndex = 0;
HEU_TerrainUtility.GetAttributeTile(session, nodeID, volumeParts[i].id, out tileIndex);
// 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 (layerType == HFLayerType.HEIGHT)
{
// Height layer always first layer
volumeBuffer._splatLayers.Insert(0, layer);
volumeBuffer._heightMapWidth = layer._heightMapWidth;
volumeBuffer._heightMapHeight = layer._heightMapHeight;
volumeBuffer._terrainSizeX = layer._terrainSizeX;
volumeBuffer._terrainSizeY = layer._terrainSizeY;
volumeBuffer._heightRange = layer._heightRange;
// The terrain heightfield position in y requires offset of min height
layer._position.y += layer._minHeight;
// Use y position from attribute if user has set it
float userYPos;
if (HEU_GeneralUtility.GetAttributeFloatSingle(session, nodeID, volumeParts[i].id,
HEU_Defines.DEFAULT_UNITY_HEIGHTFIELD_YPOS, out userYPos))
{
layer._position.y = userYPos;
}
// Look up TerrainData file path via attribute if user has set it
volumeBuffer._terrainDataPath = HEU_GeneralUtility.GetAttributeStringValueSingleStrict(session, nodeID, volumeBuffer._id,
HEU_Defines.DEFAULT_UNITY_HEIGHTFIELD_TERRAINDATA_FILE_ATTR, HAPI_AttributeOwner.HAPI_ATTROWNER_PRIM);
// Look up TerrainData export file path via attribute if user has set it
volumeBuffer._terrainDataExportPath = HEU_GeneralUtility.GetAttributeStringValueSingleStrict(session, nodeID, volumeBuffer._id,
HEU_Defines.DEFAULT_UNITY_HEIGHTFIELD_TERRAINDATA_EXPORT_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;
}
HEU_TerrainUtility.PopulateDetailProperties(session, nodeID,
volumeBuffer._id, ref volumeBuffer._detailProperties);
// Get specified material if any
volumeBuffer._specifiedTerrainMaterialName = HEU_GeneralUtility.GetMaterialAttributeValueFromPart(session,
nodeID, volumeBuffer._id);
}
else if (layer._layerType == HFLayerType.DETAIL)
{
// Get detail prototype
HEU_DetailPrototype detailPrototype = null;
HEU_TerrainUtility.PopulateDetailPrototype(session, nodeID, volumeParts[i].id, ref detailPrototype);
int[,] detailMap = HEU_TerrainUtility.GetDetailMapFromPart(session, nodeID,
volumeParts[i].id, out detailResolution);
volumeBuffer._detailPrototypes.Add(detailPrototype);
volumeBuffer._detailMaps.Add(detailMap);
// Set the detail resolution which is formed from the detail layer
if (volumeBuffer._detailProperties == null)
{
volumeBuffer._detailProperties = new HEU_DetailProperties();
}
volumeBuffer._detailProperties._detailResolution = detailResolution;
}
else
{
volumeBuffer._splatLayers.Add(layer);
}
}
}
// Each volume buffer is a self contained terrain tile
foreach (HEU_LoadBufferVolume volumeBuffer in volumeBuffers)
{
List<HEU_LoadBufferVolumeLayer> layers = volumeBuffer._splatLayers;
//HEU_Logger.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);
// 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)
{
// Ignore Detail layers as they are handled differently
if (layers[m]._layerType != HFLayerType.DETAIL)
{
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;
}
// TODO: revisit how the position is calculated
volumeBuffer._position = new Vector3(
volumeBuffer._terrainSizeX + volumeBuffer._splatLayers[0]._minBounds.x,
volumeBuffer._splatLayers[0]._position.y,
volumeBuffer._splatLayers[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;
HEU_TerrainUtility.GetAttributeTile(session, nodeID, scatterInstancerParts[i].id, out terrainTile);
// Find the volume layer associated with this part using the terrain tile index
HEU_LoadBufferVolume volumeBuffer = GetLoadBufferVolumeFromTileIndex(terrainTile, volumeBuffers);
if (volumeBuffer == null)
{
continue;
}
bool throwWarningIfNoTileAttribute = volumeBuffers.Count > 1;
foreach (HEU_LoadBufferVolume volume in volumeBuffers)
{
HEU_TerrainUtility.PopulateScatterTrees(session, nodeID, scatterInstancerParts[i].id, scatterInstancerParts[i].pointCount, ref volume._scatterTrees, throwWarningIfNoTileAttribute);
}
}
return true;
}
internal void ProcessVolumeParts(HEU_SessionBase session, List <HEU_PartData> volumeParts, bool bRebuild)
{
if (ParentAsset == null)
{
return;
}
int numVolumeParts = volumeParts.Count;
if (numVolumeParts == 0)
{
DestroyVolumeCache();
}
else if (_volumeCaches == null)
{
_volumeCaches = new List <HEU_VolumeCache>();
}
// First update volume caches. Each volume cache represents a set of terrain layers grouped by tile index.
// Therefore each volume cache represents a potential Unity Terrain (containing layers)
_volumeCaches = HEU_VolumeCache.UpdateVolumeCachesFromParts(session, this, volumeParts, _volumeCaches);
// Heightfield scatter nodes come in as mesh-type parts with attribute instancing.
// So process them here to get all the tree/detail instance scatter information.
int numParts = _parts.Count;
for (int i = 0; i < numParts; ++i)
{
// Find the terrain tile (use primitive attr). Assume 0 tile if not set (i.e. not split into tiles)
int terrainTile = 0;
HEU_TerrainUtility.GetAttributeTile(session, GeoID, _parts[i].PartID, out terrainTile);
// Find the volumecache associated with this part using the terrain tile index
HEU_VolumeCache volumeCache = GetVolumeCacheByTileIndex(terrainTile);
if (volumeCache == null)
{
continue;
}
HEU_VolumeLayer volumeLayer = volumeCache.GetLayer(_parts[i].GetVolumeLayerName());
if (volumeLayer != null && volumeLayer._layerType == HFLayerType.DETAIL)
{
// Clear out outputs since it might have been created when the part was created.
_parts[i].DestroyAllData();
volumeCache.PopulateDetailPrototype(session, GeoID, _parts[i].PartID, volumeLayer);
}
else if (_parts[i].IsAttribInstancer())
{
HAPI_AttributeInfo treeInstAttrInfo = new HAPI_AttributeInfo();
if (HEU_GeneralUtility.GetAttributeInfo(session, GeoID, _parts[i].PartID, HEU_Defines.HEIGHTFIELD_TREEINSTANCE_PROTOTYPEINDEX, ref treeInstAttrInfo))
{
if (treeInstAttrInfo.exists && treeInstAttrInfo.count > 0)
{
// Clear out outputs since it might have been created when the part was created.
_parts[i].DestroyAllData();
// Mark the instancers as having been created so that the object instancer step skips this.
_parts[i]._objectInstancesGenerated = true;
bool throwWarningIfNoTileAttribute = _volumeCaches.Count > 1;
// Now populate scatter trees based on attributes on this part
// Note: Might do redudant work for each volume and might need refactoring for performance.
foreach (HEU_VolumeCache cache in _volumeCaches)
{
cache.PopulateScatterTrees(session, GeoID, _parts[i].PartID, treeInstAttrInfo.count, throwWarningIfNoTileAttribute);
}
}
}
}
}
// Now generate the terrain for each volume cache
foreach (HEU_VolumeCache cache in _volumeCaches)
{
cache.GenerateTerrainWithAlphamaps(session, ParentAsset, bRebuild);
cache.IsDirty = false;
}
}
