From 1ccc1371b97227ae546f586e710e61f48d1a5353 Mon Sep 17 00:00:00 2001
From: kgv <kgv@opencascade.com>
Date: Sat, 9 Feb 2019 01:38:28 +0300
Subject: [PATCH] 0030486: Visualization - Rubber-band selection does not work
 with disabled overlap detection

SelectMgr_RectangularFrustum::Overlaps() now treats degenerated polygon as point instead of returning FALSE.
---
 src/SelectMgr/SelectMgr_RectangularFrustum.cxx | 15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

diff --git a/src/SelectMgr/SelectMgr_RectangularFrustum.cxx b/src/SelectMgr/SelectMgr_RectangularFrustum.cxx
index d972e19f2d..9b7f540d71 100644
--- a/src/SelectMgr/SelectMgr_RectangularFrustum.cxx
+++ b/src/SelectMgr/SelectMgr_RectangularFrustum.cxx
@@ -537,10 +537,17 @@ Standard_Boolean SelectMgr_RectangularFrustum::Overlaps (const TColgp_Array1OfPn
   else if (theSensType == Select3D_TOS_INTERIOR)
   {
     gp_Vec aPolyNorm (gp_XYZ (RealLast(), RealLast(), RealLast()));
-    if (!hasOverlap (theArrayOfPnts, aPolyNorm)
-     || !segmentPlaneIntersection (aPolyNorm,
-                                   theArrayOfPnts.First(),
-                                   thePickResult))
+    if (!hasOverlap (theArrayOfPnts, aPolyNorm))
+    {
+      return Standard_False;
+    }
+
+    if (aPolyNorm.Magnitude() <= Precision::Confusion())
+    {
+      // treat degenerated polygon as point
+      return Overlaps (theArrayOfPnts.First(), thePickResult);
+    }
+    else if (!segmentPlaneIntersection (aPolyNorm, theArrayOfPnts.First(), thePickResult))
     {
       return Standard_False;
     }
-- 
2.39.5