Raise an exception if the TBN UV layer is not found during export

diff --git a/blender/io_mspgl/mesh.py b/blender/io_mspgl/mesh.py
index 42adabe66f79c8716266e6319371d376b858d133..ac3f7c675605109266339bb4189571c7f54eaf2a 100644 (file)
--- a/blender/io_mspgl/mesh.py
+++ b/blender/io_mspgl/mesh.py
@@ -440,6 +440,8 @@ class Mesh:
                                self.compute_tbn(tbn_layer_index, progress)
                                progress.pop_task()
                                prog_step = 2
+                       else:
+                               raise Exception("TBN UV layer not found")
 
                # Split by the remaining UV layers
                for i, u in enumerate(self.uv_layers):