io_scene_fbx/import_fbx.py

@@ -559,7 +559,12 @@ def _transformation_curves_gen(item, values_arrays, channel_keys):
     # Create a setter into transform_data for each values array. e.g. a values array for 'Lcl Scaling' with channel == 2
     # would set transform_data.sca[2].
     setters = [partial(setitem, transform_prop_to_attr[fbx_prop], channel) for fbx_prop, channel in channel_keys]
-    frame_values_it = zip(*(iter(arr.data) for arr in values_arrays))
+    # Create an iterator that gets one value from each array. Each iterated tuple will be all the imported
+    # Lcl Translation/Lcl Rotation/Lcl Scaling values for a single frame, in that order.
+    # Note that an FBX animation does not have to animate all the channels, so only the animated channels of each
+    # property will be present.
+    # .data, the memoryview of an np.ndarray, is faster to iterate than the ndarray itself.
+    frame_values_it = zip(*(arr.data for arr in values_arrays))
 
     # Pre-get/calculate these to slightly reduce the work done inside the loop.
     anim_compensation_matrix = item.anim_compensation_matrix