Fix clipping near camera in orthogonal view

Fix #6836

src/Gui/NavigationStyle.cpp

@@ -622,7 +622,10 @@ void NavigationStyle::reorientCamera(SoCamera * cam, const SbRotation & rot)
 
     // Set new orientation value by accumulating the new rotation.
     cam->orientation = rot * cam->orientation.getValue();
-
+    // Fix issue with near clipping in orthogonal view
+    if (cam->getTypeId().isDerivedFrom(SoOrthographicCamera::getClassTypeId())) {
+        cam->focalDistance = static_cast<SoOrthographicCamera*>(cam)->height;
+    }
     // Reposition camera so we are still pointing at the same old focal point.
     cam->orientation.getValue().multVec(SbVec3f(0, 0, -1), direction);
     cam->position = focalpoint - cam->focalDistance.getValue() * direction;