fix bug in motion blur export of shared meshes (fixes #206)

export/blender_object.py

@@ -79,7 +79,7 @@ def convert(exporter, obj, scene, context, luxcore_scene,
         if update_shared_mesh:
             exporter.shared_meshes[mesh_key] = mesh_definitions
 
-        return props, ExportedObject(mesh_definitions)
+        return props, ExportedObject(mesh_definitions, luxcore_name)
     except Exception as error:
         msg = 'Object "%s": %s' % (obj.name, error)
         scene.luxcore.errorlog.add_warning(msg)

export/light.py

@@ -392,7 +392,7 @@ def _convert_area_lamp(obj, scene, context, luxcore_scene, gain, importance, lux
 
     fake_material_index = 0
     mesh_definition = [luxcore_name, fake_material_index]
-    exported_obj = ExportedObject([mesh_definition])
+    exported_obj = ExportedObject([mesh_definition], luxcore_name)
     return props, exported_obj
 
 

utils/__init__.py

@@ -10,10 +10,17 @@
 
 
 class ExportedObject(object):
-    def __init__(self, mesh_definitions):
+    def __init__(self, mesh_definitions, luxcore_name):
+        """
+        :param luxcore_name: The true base name of this object (without material index suffix). Passed
+                             separately because the names in mesh_definitions are incorrect for shared meshes
+        """
+
         # Note that luxcore_names is a list of names (because an object in Blender can have multiple materials,
         # while in LuxCore it can have only one material, so we have to split it into multiple LuxCore objects)
-        self.luxcore_names = [lux_obj_name for lux_obj_name, material_index in mesh_definitions]
+        self.luxcore_names = []
+        for _, material_index in mesh_definitions:
+            self.luxcore_names.append(luxcore_name + "%03d" % material_index)
         # list of lists of the form [lux_obj_name, material_index]
         self.mesh_definitions = mesh_definitions