From 8a41d7a47a0f051aea102ad08d1f7d8697c73977 Mon Sep 17 00:00:00 2001
From: Pyogenics <py0g3n1cs@gmail.com>
Date: Sun, 6 Apr 2025 19:47:12 +0100
Subject: [PATCH] Import normal vertex buffers to correct inaccurate lighting
 in blender due to bad geometry

---
 io_scene_a3d/A3DBlenderImporter.py | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/io_scene_a3d/A3DBlenderImporter.py b/io_scene_a3d/A3DBlenderImporter.py
index 68e23c7..c0be3c2 100644
--- a/io_scene_a3d/A3DBlenderImporter.py
+++ b/io_scene_a3d/A3DBlenderImporter.py
@@ -157,8 +157,16 @@ class A3DBlenderImporter:
                 me.polygons[faceI+faceIndexBase].material_index = submeshI
             faceIndexBase += submesh.indexCount//3
 
-        # Finalise
+        #XXX: call this before we assign split normals, if you do not it causes a segmentation fault
         me.validate()
+
+        # Split normals
+        if len(normal1) != 0:
+            me.normals_split_custom_set_from_vertices(normal1)
+        elif len(normal2) != 0:
+            me.normals_split_custom_set_from_vertices(normal2)
+
+        # Finalise
         me.update()
         return me