--- release/scripts/modules/bpy_extras/view3d_utils.py
+++ release/scripts/modules/bpy_extras/view3d_utils.py
@@ -54,9 +54,9 @@ def region_2d_to_vector_3d(region, rv3d, coord):
 
         w = out.dot(persinv[3].xyz) + persinv[3][3]
 
-        return ((persinv * out) / w) - viewinv.translation
+        return (((persinv * out) / w) - viewinv.translation).normalized()
     else:
-        return viewinv.col[2].xyz.normalized()
+        return viewinv.col[2].xyz.normalized() * -1
 
 
 def region_2d_to_origin_3d(region, rv3d, coord):