Add an option to automatically detect if tangents need to be exported

[libs/gl.git] / blender / io_mspgl / mesh.py

diff --git a/blender/io_mspgl/mesh.py b/blender/io_mspgl/mesh.py
index 9741b8dd916f28495d3e25cde8fd64e767a7d118..6b0e6805a7dfe3d88ab1cf44bcce08d391a28dc8 100644 (file)
--- a/blender/io_mspgl/mesh.py
+++ b/blender/io_mspgl/mesh.py
@@ -158,7 +158,6 @@ class Mesh:
                self.winding_test = mesh.winding_test
                self.smoothing = mesh.smoothing
                self.use_uv = mesh.use_uv
-               self.tangent_vecs = mesh.tangent_vecs
                self.tangent_uvtex = mesh.tangent_uvtex
                self.vertex_groups = mesh.vertex_groups
 
@@ -229,6 +228,21 @@ class Mesh:
                else:
                        self.lines = []
 
+               # Check if tangent vectors are needed
+               if mesh.tangent_vecs=='NO':
+                       self.tangent_vecs = False
+               elif mesh.tangent_vecs=='YES':
+                       self.tangent_vecs = True
+               elif mesh.tangent_vecs=='AUTO':
+                       from .material import Material
+                       self.tangent_vecs = False
+                       for m in self.materials:
+                               mat = Material(m)
+                               if mat.type=="pbr":
+                                       normal_prop = next((p for p in mat.properties if p.tex_keyword=="normal_map"), None)
+                                       if normal_prop and normal_prop.texture:
+                                               self.tangent_vecs = True
+
                self.vertex_sequence = []
 
        def transform(self, matrix):