[Bf-extensions-cvs] [2933364a] blender-v2.81-release: 3D-Print: fix error using evaluated mesh as obj data

[Mikhail Rachinskiy]

Commit: 2933364ad9c69c2fe9f4d66333ef809af0ebf14f
Author: Mikhail Rachinskiy
Date:   Wed Oct 16 12:15:42 2019 +0400
Branches: blender-v2.81-release
https://developer.blender.org/rBA2933364ad9c69c2fe9f4d66333ef809af0ebf14f

3D-Print: fix error using evaluated mesh as obj data

===================================================================

M	object_print3d_utils/mesh_helpers.py

===================================================================

diff --git a/object_print3d_utils/mesh_helpers.py b/object_print3d_utils/mesh_helpers.py
index bb0230e5..37170e53 100644
--- a/object_print3d_utils/mesh_helpers.py
+++ b/object_print3d_utils/mesh_helpers.py
@@ -228,7 +228,7 @@ def object_merge(context, objects):
 
         # convert each to a mesh
         obj_eval = obj.evaluated_get(depsgraph)
-        mesh_new = obj_eval.to_mesh()
+        mesh_new = obj_eval.to_mesh().copy()
 
         # remove non-active uvs/vcols
         cd_remove_all_but_active(mesh_new.vertex_colors)
@@ -245,6 +245,7 @@ def object_merge(context, objects):
 
         bpy.ops.object.join(override)
 
+        bpy.data.meshes.remove(mesh_new)
         obj_eval.to_mesh_clear()
 
     layer.update()