/// <summary>
/// Returns list of HEU_TreePrototypeInfo formed by querying data from given part.
/// </summary>
/// <param name="session">Houdini Engine session</param>
/// <param name="geoID">Geometry object</param>
/// <param name="partID">Part ID</param>
/// <returns>Returns list of HEU_TreePrototypeInfo or null if none found.</returns>
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.
int index = 0;
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;
}