From 1ffdb3278d27b8bc7761d45bf3822281f76e2dc4 Mon Sep 17 00:00:00 2001
From: dmv <dmv@opencascade.com>
Date: Thu, 3 Dec 2009 14:15:20 +0000
Subject: [PATCH] IPAL21489	Filter by Scalars... does not show visible
 elements for some presentations.

---
 doc/salome/gui/VISU/input/viewing_3d_presentations.doc |  2 ++
 src/VISUGUI/VISU_msg_en.ts                             |  4 ++++
 src/VISU_I/VISU_Prs3d_i.cc                             | 10 ++++++++--
 3 files changed, 14 insertions(+), 2 deletions(-)

diff --git a/doc/salome/gui/VISU/input/viewing_3d_presentations.doc b/doc/salome/gui/VISU/input/viewing_3d_presentations.doc
index b4545de6..40ad0203 100644
--- a/doc/salome/gui/VISU/input/viewing_3d_presentations.doc
+++ b/doc/salome/gui/VISU/input/viewing_3d_presentations.doc
@@ -28,6 +28,8 @@ viewer.</li>
 has been created and change its parameters.</li>
 <li><b>Filter by Scalars</b> - allows showing only the cells with
 values that fit into the defined <b>Scalar Range</b>.
+<br>If the presentation is created on nodes, only the cells with all 
+nodes lying in the range defined by the scalar filter will be visible.
 
 \image html viewing2.png
 
diff --git a/src/VISUGUI/VISU_msg_en.ts b/src/VISUGUI/VISU_msg_en.ts
index f8fddcb9..7a04f283 100644
--- a/src/VISUGUI/VISU_msg_en.ts
+++ b/src/VISUGUI/VISU_msg_en.ts
@@ -454,6 +454,10 @@ Do you want to enlarge the cache?</translation>
             <source>WRN_NO_AVAILABLE_DATA</source>
             <translation>No Available data in selection</translation>
         </message>
+	<message>
+            <source>WRN_NO_VISIBLE_ELEMENTS</source>
+            <translation>There are no visible elements.</translation>
+        </message>
         <message>
             <source>WRN_STUDY_LOCKED</source>
             <translation>Current Study is locked</translation>
diff --git a/src/VISU_I/VISU_Prs3d_i.cc b/src/VISU_I/VISU_Prs3d_i.cc
index 620cf98d..4f61facd 100644
--- a/src/VISU_I/VISU_Prs3d_i.cc
+++ b/src/VISU_I/VISU_Prs3d_i.cc
@@ -33,6 +33,7 @@
 
 #include "SALOME_Event.h"
 #include "SUIT_ResourceMgr.h"
+#include "SUIT_MessageBox.h"
 
 #include <vtkActorCollection.h>
 #include <vtkUnstructuredGrid.h>
@@ -382,8 +383,13 @@ VISU::Prs3d_i
 
   aDataSet->Update();
   static float eps = VTK_LARGE_FLOAT * 0.1 ;
-  if (!aDataSet->GetNumberOfCells())
-    throw std::runtime_error("There are no visible elements");
+  if (!aDataSet->GetNumberOfCells()) {
+    SUIT_MessageBox::warning( 0,
+                              QObject::tr("WRN_VISU"),
+                              QObject::tr("WRN_NO_VISIBLE_ELEMENTS"),
+                              QObject::tr("BUT_OK"));
+    return;
+  }
 
   if (aDataSet->GetLength() > eps)
     throw std::runtime_error("Diagonal of the actor is too large !!!");
-- 
2.39.2