[vtkusers] bug in vtkImageStack

[David Gobbi]

I've pushed the fix.  Here's the patch, if you are curious.

--- a/Rendering/vtkImageStack.cxx
+++ b/Rendering/vtkImageStack.cxx
@@ -332,8 +332,8 @@ int
vtkImageStack::RenderTranslucentPolygonalGeometry(vtkViewport* viewport)
    {
    // no multi-pass if only one image
    this->Images->InitTraversal(pit);
-    image->SetAllocatedRenderTime(renderTime, viewport);
    image = this->Images->GetNextImage(pit);
+    image->SetAllocatedRenderTime(renderTime, viewport);
    return image->RenderTranslucentPolygonalGeometry(viewport);
    }

@@ -377,8 +377,8 @@ int vtkImageStack::RenderOverlay(vtkViewport* viewport)
    {
    // no multi-pass if only one image
    this->Images->InitTraversal(pit);
-    image->SetAllocatedRenderTime(renderTime, viewport);
    image = this->Images->GetNextImage(pit);
+    image->SetAllocatedRenderTime(renderTime, viewport);
    return image->RenderOverlay(viewport);
    }
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