From 90b858262b5572171a52df967bdb7fc8d507cab1 Mon Sep 17 00:00:00 2001
From: ski <ski@opencascade.com>
Date: Thu, 6 Oct 2016 12:30:39 +0300
Subject: [PATCH] 0027905: Visualization - randomly directed arrows on test v3d
 mesh B7

Behaviour of command meshvectors is stable now.
It shows default vector (0,0,1) for volume entity.
Test cases for issue CR27905
---
 src/XSDRAWSTLVRML/XSDRAWSTLVRML.cxx |  8 +++++---
 tests/bugs/demo/bug27905            | 24 ++++++++++++++++++++++++
 2 files changed, 29 insertions(+), 3 deletions(-)
 create mode 100755 tests/bugs/demo/bug27905

diff --git a/src/XSDRAWSTLVRML/XSDRAWSTLVRML.cxx b/src/XSDRAWSTLVRML/XSDRAWSTLVRML.cxx
index 43e5d31787..c7e9818cd2 100644
--- a/src/XSDRAWSTLVRML/XSDRAWSTLVRML.cxx
+++ b/src/XSDRAWSTLVRML/XSDRAWSTLVRML.cxx
@@ -965,9 +965,11 @@ static Standard_Integer meshvectors( Draw_Interpretor& di,
     for ( ; anIter.More(); anIter.Next() )
     {
       Standard_Boolean IsValidData = Standard_False; 
-      if (anIsElement)
-        IsValidData = aMesh->GetDataSource()->GetNormal(anIter.Key(), 3, aCoords.ChangeValue(1), aCoords.ChangeValue(2), aCoords.ChangeValue(3));
-      else
+      if (anIsElement) {
+        aMesh->GetDataSource()->GetGeomType(anIter.Key(), anIsElement, aEntType);
+        if (aEntType == MeshVS_ET_Face)
+          IsValidData = aMesh->GetDataSource()->GetNormal(anIter.Key(), 3, aCoords.ChangeValue(1), aCoords.ChangeValue(2), aCoords.ChangeValue(3));
+      } else
         IsValidData = aMesh->GetDataSource()->GetGeom(anIter.Key(), Standard_False, aCoords, aNbNodes, aEntType);
 
       gp_Vec aNorm;
diff --git a/tests/bugs/demo/bug27905 b/tests/bugs/demo/bug27905
new file mode 100755
index 0000000000..6565838f34
--- /dev/null
+++ b/tests/bugs/demo/bug27905
@@ -0,0 +1,24 @@
+puts "============"
+puts "CR27905"
+puts "============"
+puts ""
+##########################################################################################################
+# Visualization - randomly directed arrows on test v3d mesh B7
+##########################################################################################################
+
+pload XSDRAW
+
+vinit
+vclear
+
+mesh3delem m
+vsetdispmode m 5
+
+meshvectors m -mode elem -maxlen 10 -color green -arrowpart 0.5 -issipmle 0
+vdump ${imagedir}/${test_image}_1.png
+
+meshvectors m -mode elem -maxlen 10 -color green -arrowpart 0.5 -issipmle 0
+vdump ${imagedir}/${test_image}_2.png
+
+meshvectors m -mode elem -maxlen 10 -color green -arrowpart 0.5 -issipmle 0
+vdump ${imagedir}/${test_image}_3.png