diff --git a/leenkx/blender/lnx/exporter.py b/leenkx/blender/lnx/exporter.py
index 8980b43..860bf84 100644
--- a/leenkx/blender/lnx/exporter.py
+++ b/leenkx/blender/lnx/exporter.py
@@ -1727,6 +1727,7 @@ class LeenkxExporter:
             tangdata = np.array(tangdata, dtype='<i2')
 
         # Output
+        o['sorting_index'] = bobject.lnx_sorting_index
         o['vertex_arrays'] = []
         o['vertex_arrays'].append({ 'attrib': 'pos', 'values': pdata, 'data': 'short4norm' })
         o['vertex_arrays'].append({ 'attrib': 'nor', 'values': ndata, 'data': 'short2norm' })