From: Mikko Rasa <tdb@tdb.fi>
Date: Tue, 30 Jul 2024 15:30:19 +0000 (+0300)
Subject: Deep copy vertex groups when copying vertices in the exporter
X-Git-Url: https://git.tdb.fi/?a=commitdiff_plain;h=e1be0d24e3a38d931897358a96d5ddc000c153f0;p=libs%2Fgl.git

Deep copy vertex groups when copying vertices in the exporter

If multiple vertices reference the same group data after splitting
by normals, group mapping gets applied multiple times, resulting in
incorrect group indices.
---

diff --git a/blender/io_mspgl/mesh.py b/blender/io_mspgl/mesh.py
index c0d9c11b..0856ef2a 100644
--- a/blender/io_mspgl/mesh.py
+++ b/blender/io_mspgl/mesh.py
@@ -47,9 +47,11 @@ class Vertex:
 		if vertex.__class__==Vertex:
 			self.uvs = vertex.uvs[:]
 			self.tan = vertex.tan
+			self.groups = [VertexGroup(g) for g in vertex.groups]
 		else:
 			self.uvs = []
 			self.tan = None
+			self.groups = []
 		self.index = vertex.index
 		self.co = mathutils.Vector(vertex.co)
 		self.normal = mathutils.Vector(vertex.normal)
@@ -57,7 +59,6 @@ class Vertex:
 		self.flag = False
 		self.edges = []
 		self.faces = []
-		self.groups = vertex.groups[:]
 
 	def __cmp__(self, other):
 		if other is None:
@@ -178,7 +179,7 @@ class Mesh:
 		self.vertices = [Vertex(v) for v in mesh.vertices]
 		if self.vertex_groups:
 			for v in self.vertices:
-				v.groups = [VertexGroup(g) for g in v.groups]
+				v.groups = [VertexGroup(g) for g in mesh.vertices[v.index].groups]
 
 		self.faces = [Face(f) for f in mesh.polygons]
 		self.edges = [Edge(e) for e in mesh.edges]