From e34a7746ec0b9f82124e344edc79e348bb0278d2 Mon Sep 17 00:00:00 2001
From: srit <srit>
Date: Tue, 15 Mar 2011 15:37:39 +0000
Subject: [PATCH] Return nan when quering scalar value outside whole extent

---
 vv/vvSlicer.cxx | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/vv/vvSlicer.cxx b/vv/vvSlicer.cxx
index 24a552b..86824a2 100644
--- a/vv/vvSlicer.cxx
+++ b/vv/vvSlicer.cxx
@@ -1214,6 +1214,14 @@ double vvSlicer::GetScalarComponentAsDouble(vtkImageData *image, int X, double Y
   ix = lrint(X);
   iy = lrint(Y);
   iz = lrint(Z);
+  if (ix < image->GetWholeExtent()[0] ||
+      ix > image->GetWholeExtent()[1] ||
+      iy < image->GetWholeExtent()[2] ||
+      iy > image->GetWholeExtent()[3] ||
+      iz < image->GetWholeExtent()[4] ||
+      iz > image->GetWholeExtent()[5] )
+    return sqrt(-1);
+
   image->SetUpdateExtent(ix, ix, iy, iy, iz, iz);
   image->Update();
   return image->GetScalarComponentAsDouble(ix, iy, iz, component);
-- 
2.45.2