Fix #130705: importing/exporting FBX with lights fails

scripts/addons_core/io_scene_fbx/export_fbx_bin.py

@@ -588,11 +588,12 @@ def fbx_data_light_elements(root, lamp, scene_data):
     light_key = scene_data.data_lights[lamp]
     do_light = True
     do_shadow = False
+    # NOTE: this was removed from lamps, always write black.
     shadow_color = Vector((0.0, 0.0, 0.0))
     if lamp.type not in {'HEMI'}:
         do_light = True
         do_shadow = lamp.use_shadow
-        shadow_color = lamp.shadow_color
+        # `shadow_color = lamp.shadow_color`: now removed.
 
     light = elem_data_single_int64(root, b"NodeAttribute", get_fbx_uuid_from_key(light_key))
     light.add_string(fbx_name_class(lamp.name.encode(), b"NodeAttribute"))

scripts/addons_core/io_scene_fbx/import_fbx.py

@@ -2233,8 +2233,8 @@ def blen_read_light(fbx_tmpl, fbx_obj, settings):
     lamp.use_shadow = elem_props_get_bool(fbx_props, b'CastShadow', True)
     if hasattr(lamp, "cycles"):
         lamp.cycles.cast_shadow = lamp.use_shadow
-    # Keeping this for now, but this is not used nor exposed anymore afaik...
-    lamp.shadow_color = elem_props_get_color_rgb(fbx_props, b'ShadowColor', (0.0, 0.0, 0.0))
+    # Removed but could be restored if the value can be applied.
+    # `lamp.shadow_color = elem_props_get_color_rgb(fbx_props, b'ShadowColor', (0.0, 0.0, 0.0))`
 
     if settings.use_custom_props:
         blen_read_custom_properties(fbx_obj, lamp, settings)