diff -ur vtk-5.4.2~/Imaging/vtkGaussianSplatter.cxx vtk-5.4.2/Imaging/vtkGaussianSplatter.cxx
--- vtk-5.4.2~/Imaging/vtkGaussianSplatter.cxx	2008-01-15 06:26:18.000000000 +0900
+++ vtk-5.4.2/Imaging/vtkGaussianSplatter.cxx	2010-04-05 17:36:18.000000000 +0900
@@ -62,38 +62,15 @@
 //----------------------------------------------------------------------------
 int vtkGaussianSplatter::RequestInformation (
   vtkInformation * vtkNotUsed(request),
-  vtkInformationVector ** vtkNotUsed( inputVector ),
+  vtkInformationVector **inputVector,
   vtkInformationVector *outputVector)
 {
   // get the info objects
   vtkInformation* outInfo = outputVector->GetInformationObject(0);
-
-  // use model bounds if set
-  this->Origin[0] = 0;
-  this->Origin[1] = 0;
-  this->Origin[2] = 0;
-  if ( this->ModelBounds[0] < this->ModelBounds[1] &&
-       this->ModelBounds[2] < this->ModelBounds[3] &&
-       this->ModelBounds[4] < this->ModelBounds[5] )
-    {
-    this->Origin[0] = this->ModelBounds[0];
-    this->Origin[1] = this->ModelBounds[2];
-    this->Origin[2] = this->ModelBounds[4];
-    }
-
-  outInfo->Set(vtkDataObject::ORIGIN(), this->Origin, 3);
-
-  int i;  
-  for (i=0; i<3; i++)
-    {
-    this->Spacing[i] = (this->ModelBounds[2*i+1] - this->ModelBounds[2*i])
-      / (this->SampleDimensions[i] - 1);
-    if ( this->Spacing[i] <= 0.0 )
-      {
-      this->Spacing[i] = 1.0;
-      }
-    }
-  outInfo->Set(vtkDataObject::SPACING(),this->Spacing,3);
+  vtkInformation *inInfo = inputVector[0]->GetInformationObject(0);
+  vtkDataSet *input = vtkDataSet::SafeDownCast(
+    inInfo->Get(vtkDataObject::DATA_OBJECT()));
+  ComputeModelBounds(input, NULL, outInfo);
   
   outInfo->Set(vtkStreamingDemandDrivenPipeline::WHOLE_EXTENT(),
                0, this->SampleDimensions[0] - 1, 
@@ -162,7 +139,10 @@
     this->Visited[i] = 0;
     }
 
-  output->SetDimensions(this->GetSampleDimensions());
+  if ( output != NULL )
+    {
+    output->SetDimensions(this->GetSampleDimensions());
+    }
   this->ComputeModelBounds(input,output, outInfo);
 
   //  Set up function pointers to sample functions
@@ -320,7 +300,10 @@
                this->ModelBounds[0],this->ModelBounds[2],
                this->ModelBounds[4]);
   memcpy(this->Origin,outInfo->Get(vtkDataObject::ORIGIN()), sizeof(double)*3);
-  output->SetOrigin(this->Origin);
+  if ( output != NULL )
+    {
+    output->SetOrigin(this->Origin);
+    }
   
   for (i=0; i<3; i++)
     {
@@ -332,7 +315,10 @@
       }
     }
   outInfo->Set(vtkDataObject::SPACING(),this->Spacing,3);
-  output->SetSpacing(this->Spacing);
+  if ( output != NULL )
+    {
+    output->SetSpacing(this->Spacing);
+    }
   
   // Determine the splat propagation distance...used later
   for (i=0; i<3; i++)