fix: Flipped normals

* normalization fix

normalizes normal vector instead of component tangents, fixes problem with flipped normals

* Update GLMesh.cpp

src/Gui/Viewport/GLMesh.cpp

@@ -89,10 +89,8 @@ void GLMesh::setPosBuffer(enzo::geo::Geometry& geometry)
                 enzo::bt::Vector3 tang1 = (pos2-pos1);
                 enzo::bt::Vector3 tang2 = (pos3-pos1);
 
-                tang1.normalize();
-                tang2.normalize();
-
                 Normal = tang1.cross(tang2);
+                Normal.normalize();
             }
 
             for(int i=0; i< faceVertCnt; ++i)