Sketcher: fix back face picking detection when editing

Related realthunder/FreeCAD_assembly3#605
realthunder · May 12, 2021 · d75e89f · d75e89f
1 parent 4dd0011
commit d75e89f
Showing 1 changed file with 5 additions and 3 deletions.
diff --git a/src/Mod/Sketcher/Gui/ViewProviderSketch.cpp b/src/Mod/Sketcher/Gui/ViewProviderSketch.cpp
@@ -2938,9 +2938,11 @@ void ViewProviderSketch::updateColor(void)
 
     SbVec3f pnt, dir;
     edit->viewer->getNearPlane(pnt, dir);
-    auto pla = getEditingPlacement();
-    Base::Vector3d norm(0, 0, 1);
-    pla.multVec(norm, norm);
+    auto transform = getEditingPlacement();
+    Base::Vector3d v0, v1;
+    transform.multVec(Base::Vector3d(0,0,0), v0);
+    transform.multVec(Base::Vector3d(0,0,1), v1);
+    Base::Vector3d norm = v1 - v0;
     norm.Normalize();
     float zdir = norm.Dot(Base::Vector3d(dir[0], dir[1], dir[2])) < 0.0f ? -1.0 : 1.0;