private static bool getSession( out HAPI_Session session, string pipe_name )
 {
     #if ( UNITY_STANDALONE_WIN || UNITY_STANDALONE_OSX || ( UNITY_METRO && UNITY_EDITOR ) )
     HAPI_Result status_code = HAPI_CreateThriftNamedPipeSession( out session, prPipeName );
     if ( status_code != HAPI_Result.HAPI_RESULT_SUCCESS )
     {
         prLastInitializationError =
             "Could not create the RPC pipe session.\n" +
             "Make sure " + prServerExecutablePath + " exists.";
         return false;
     }
     prSessionID = session.id;
     #else
     session.id = 0;
     session.type = HAPI_SessionType.HAPI_SESSION_INPROCESS;
     #endif // UNITY_EDITOR
     return true;
 }

	HAPI_SetPartInfo(
		ref HAPI_Session session,
		HAPI_AssetId asset_id, HAPI_ObjectId object_id, HAPI_GeoId geo_id,
		ref HAPI_PartInfo part_info );

	HAPI_GetImageMemoryBuffer(
		ref HAPI_Session session,
		HAPI_AssetId asset_id, HAPI_MaterialId material_id,
		[Out] byte[] buffer,
		int length );

	HAPI_ExtractImageToFile(
		ref HAPI_Session session,
		HAPI_AssetId asset_id, HAPI_MaterialId material_id,
		string image_file_format_name,
		string image_planes,
		string destination_folder_path,
		string destination_file_name,
		out int destination_file_path );

	HAPI_GetImagePlaneCount(
		ref HAPI_Session session,
		HAPI_AssetId asset_id, HAPI_MaterialId material_id,
		out int image_plane_count );

	HAPI_GetSupportedImageFileFormats(
		ref HAPI_Session session,
		[Out] HAPI_ImageFileFormat[] formats_array,
		int file_format_count );

	HAPI_RenderTextureToImage(
		ref HAPI_Session session,
		HAPI_AssetId asset_id, HAPI_MaterialId material_id,
		HAPI_ParmId parm_id );

	HAPI_GetMaterialOnPart(
		ref HAPI_Session session,
		HAPI_AssetId asset_id, HAPI_ObjectId object_id, HAPI_GeoId geo_id, HAPI_PartId part_id,
		out HAPI_MaterialInfo material_info );

	HAPI_SetGroupMembership(
		ref HAPI_Session session,
		HAPI_AssetId asset_id, HAPI_ObjectId object_id, HAPI_GeoId geo_id,
		HAPI_GroupType group_type,
		string group_name,
		[Out] int[] membership_array,
		int start, int length );

	HAPI_AddGroup(
		ref HAPI_Session session,
		HAPI_AssetId asset_id, HAPI_ObjectId object_id, HAPI_GeoId geo_id,
		HAPI_GroupType group_type,
		string group_name );

	HAPI_SetAttributeStringData(
		ref HAPI_Session session,
		HAPI_AssetId asset_id, HAPI_ObjectId object_id, HAPI_GeoId geo_id,
		string name,
		ref HAPI_AttributeInfo attr_info,
		string[] data_array,
		int start, int length );

	HAPI_AddAttribute(
		ref HAPI_Session session,
		HAPI_AssetId asset_id, HAPI_ObjectId object_id, HAPI_GeoId geo_id,
		string name,
		ref HAPI_AttributeInfo attr_info );

	HAPI_SetVertexList(
		ref HAPI_Session session,
		HAPI_AssetId asset_id, HAPI_ObjectId object_id, HAPI_GeoId geo_id,
		int[] vertex_list_array,
		int start, int length );

	HAPI_CloseSession( ref HAPI_Session session );

	HAPI_SetFaceCounts(
		ref HAPI_Session session,
		HAPI_AssetId asset_id, HAPI_ObjectId object_id, HAPI_GeoId geo_id,
		int[] face_counts_array,
		int start, int length );

	HAPI_GetMaterialIdsOnFaces(
		ref HAPI_Session session,
		HAPI_AssetId asset_id, HAPI_ObjectId object_id, HAPI_GeoId geo_id, HAPI_PartId part_id,
		[ MarshalAs( UnmanagedType.U1 ) ] ref bool are_all_the_same,
		[Out] HAPI_MaterialId[] material_ids_array,
		int start, int length );

	HAPI_GetMaterialInfo(
		ref HAPI_Session session,
		HAPI_AssetId asset_id, HAPI_MaterialId material_id,
		out HAPI_MaterialInfo material_info );

	HAPI_IsInitialized( ref HAPI_Session session );

	HAPI_GetMaterialOnGroup(
		ref HAPI_Session session,
		HAPI_AssetId asset_id, HAPI_ObjectId object_id, HAPI_GeoId geo_id,
		string group_name,
		out HAPI_MaterialInfo material_info );

	HAPI_RevertGeo(
		ref HAPI_Session session,
		HAPI_AssetId asset_id, HAPI_ObjectId object_id, HAPI_GeoId geo_id );