I'm having trouble when outputting point data to unity through session sync. To use the tree instance scatter, I need to apply the attribute to points:
unity_hf_treeinstance_prototypeindex - Set the index (Integer) of the TreePrototype to use (starting at 0)
When scattering points to place other objects (in this case rocks), I apply the unity_instance attribute.
The problem is that the default unity_hf_tree_instance_prototypeindex is 0, which is also applied to each point with the unity_instance for my rock scatter, causing trees to be scattered at each rock location.
Is there an ignore attribute I need to add to non tree points, or a different way of combining the data than a merge node, which sets the default tree index to 0 for all points?
I've tried modifying the start index for trees to 1 so that when points are merged the default (0) index isn't used, but I'm still seeing trees instanced on the terrain through the tree system at the location of all points:
public static List<HEU_TreePrototypeInfo> GetTreePrototypeInfosFromPart(HEU_SessionBase session, HAPI_NodeId geoID, HAPI_PartId partID) { List<HEU_TreePrototypeInfo> treePrototypes = new List<HEU_TreePrototypeInfo>(); // Each TreePrototype data is stored as a string attribute, under the 'HEU_Defines.HEIGHTFIELD_TREEPROTOTYPE + index' // name. So check and parse until no more valid attributes found. // CHANGED START INDEX 0 -> 1 int index = 1; while (true) { // Does this attribute exist? string attrName = HEU_Defines.HEIGHTFIELD_TREEPROTOTYPE + index.ToString(); if (!HEU_GeneralUtility.HasAttribute(session, geoID, partID, attrName, HAPI_AttributeOwner.HAPI_ATTROWNER_PRIM)) { break; } index++; // Get the string value HAPI_AttributeInfo treeAttrInfo = new HAPI_AttributeInfo(); string[] protoAttrString = HEU_GeneralUtility.GetAttributeStringData(session, geoID, partID, attrName, ref treeAttrInfo); if (protoAttrString == null || protoAttrString.Length == 0 || string.IsNullOrEmpty(protoAttrString[0])) { break; } // Parse the attribute string value: // Only expecting a single element here, comma-separated for the asset path and bend factor: // => asset_path,bend_factor string[] properties = protoAttrString[0].Split(','); if (properties.Length > 0 && !string.IsNullOrEmpty(properties[0])) { HEU_TreePrototypeInfo prototype = new HEU_TreePrototypeInfo(); prototype._prefabPath = properties[0]; if (properties.Length >= 2) { float.TryParse(properties[1], out prototype._bendfactor); } treePrototypes.Add(prototype); } } return treePrototypes.Count > 0 ? treePrototypes : null; }