Reduce reallocations by using lists instead of tuples. This yields massive performance improvements when exporting large files. Thanks to Rafał Brzeżański for pointing this out.

1 files changed, 4 insertions, 3 deletions

diff --git a/io_scene_x/export_x.py b/io_scene_x/export_x.py
index 08a77176..bde0fd26 100644
--- a/io_scene_x/export_x.py
+++ b/io_scene_x/export_x.py
@@ -427,10 +427,11 @@ class MeshExportObject(ExportObject):
         def __init__(self, Mesh):
             MeshExportObject._MeshEnumerator.__init__(self, Mesh)
             
-            self.vertices = tuple()
+            self.vertices = []
             for Polygon in Mesh.polygons:
-                self.vertices += tuple(Mesh.vertices[VertexIndex]
-                    for VertexIndex in Polygon.vertices)
+                self.vertices += [Mesh.vertices[VertexIndex]
+                    for VertexIndex in Polygon.vertices]
+            self.vertices = tuple(self.vertices)
             
             self.PolygonVertexIndices = []
             Index = 0