From 76b1ede0bddcb62b460f88a0edf893a1785cfac3 Mon Sep 17 00:00:00 2001
From: ouv <ouv@opencascade.com>
Date: Mon, 17 Oct 2005 06:48:16 +0000
Subject: [PATCH] Fixed Bug GVIEW10293 : Low plane of Segmentation cursor is
 invisible and unselectable on the low fase of bounding box

---
 src/PIPELINE/VISU_ImplicitFunctionWidget.cxx | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/src/PIPELINE/VISU_ImplicitFunctionWidget.cxx b/src/PIPELINE/VISU_ImplicitFunctionWidget.cxx
index fb8f407f..258fcafa 100644
--- a/src/PIPELINE/VISU_ImplicitFunctionWidget.cxx
+++ b/src/PIPELINE/VISU_ImplicitFunctionWidget.cxx
@@ -1005,6 +1005,13 @@ void VISU_ImplicitFunctionWidget::Push(double *p1, double *p2)
   v[1] = p2[1] - p1[1];
   v[2] = p2[2] - p1[2];
   
+  float z0 = this->Plane->GetOrigin()[2];
+  double distance = vtkMath::Dot( v, myPlane2->GetNormal() );
+  float z1 = z0 + distance * myPlane2->GetNormal()[2];
+
+  if( z1 <= this->Box->GetOrigin()[2] )
+    return;
+
   this->Plane->Push( vtkMath::Dot(v,this->Plane->GetNormal()) );
   this->SetOrigin(this->Plane->GetOrigin());
   myPlane2->Push( vtkMath::Dot(v,this->Plane->GetNormal()) );
-- 
2.39.2