From: Konstantin LEONTEV <konstantin.leontev@opencascade.com>
Date: Wed, 31 Aug 2022 13:00:11 +0000 (+0300)
Subject: Mantis 0054772: crash when select point in viewer inside created face
X-Git-Tag: V9_10_0a1~3
X-Git-Url: http://git.salome-platform.org/gitweb/?a=commitdiff_plain;h=46676347f26294f60ec56f5d31abb87bceebf317;p=modules%2Fgeom.git

Mantis 0054772: crash when select point in viewer inside created face
---

diff --git a/src/GEOMUtils/GEOMUtils.cxx b/src/GEOMUtils/GEOMUtils.cxx
index 4c69a9a05..24d7318c0 100644
--- a/src/GEOMUtils/GEOMUtils.cxx
+++ b/src/GEOMUtils/GEOMUtils.cxx
@@ -1089,17 +1089,17 @@ gp_Pnt GEOMUtils::ProjectPointOnFace(const gp_Pnt& thePoint,
 //=======================================================================
 gp_Pnt GEOMUtils::ConvertClickToPoint( int x, int y, Handle(V3d_View) aView )
 {
-  V3d_Coordinate XEye, YEye, ZEye, XAt, YAt, ZAt;
-  aView->Eye( XEye, YEye, ZEye );
+  // We can't rely on Eye and At points to get EyeDir, because they collapse
+  // for views with flat bounding boxes. For example if you create a circle and
+  // switch to the top view, then both camera's Eye and At points will fall to zero
+  // inside V3d_View::FitMinMax() method. It's by occt design.
+  // So, we should use camera direction instead.
 
-  aView->At( XAt, YAt, ZAt );
-  gp_Pnt EyePoint( XEye, YEye, ZEye );
-  gp_Pnt AtPoint( XAt, YAt, ZAt );
+  V3d_Coordinate XAt, YAt, ZAt;
+  aView->At(XAt, YAt, ZAt);
+  gp_Pnt AtPoint(XAt, YAt, ZAt);
 
-  gp_Vec EyeVector( EyePoint, AtPoint );
-  gp_Dir EyeDir( EyeVector );
-
-  gp_Pln PlaneOfTheView = gp_Pln( AtPoint, EyeDir );
+  gp_Pln PlaneOfTheView = gp_Pln( AtPoint, aView->Camera()->Direction() );
   Standard_Real X, Y, Z;
   aView->Convert( x, y, X, Y, Z );
   gp_Pnt ConvertedPoint( X, Y, Z );