From df8c01ae412d495c7be6f829cf6abd333b071fa5 Mon Sep 17 00:00:00 2001
From: Yogesh9000 <96904418+Yogesh9000@users.noreply.github.com>
Date: Fri, 27 Sep 2024 11:01:11 +0530
Subject: [PATCH] Improve Startup Performance (#1635)

---
 vtkext/private/module/vtkF3DGenericImporter.cxx | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/vtkext/private/module/vtkF3DGenericImporter.cxx b/vtkext/private/module/vtkF3DGenericImporter.cxx
index 8ba35b36ed..49c07d72b7 100644
--- a/vtkext/private/module/vtkF3DGenericImporter.cxx
+++ b/vtkext/private/module/vtkF3DGenericImporter.cxx
@@ -32,7 +32,6 @@ struct ReaderPipeline
   ReaderPipeline()
   {
     this->GeometryActor->GetProperty()->SetInterpolationToPBR();
-    this->VolumeMapper->SetRequestedRenderModeToGPU();
     this->PolyDataMapper->InterpolateScalarsBeforeMappingOn();
   }
 
@@ -47,7 +46,7 @@ struct ReaderPipeline
   vtkNew<vtkVolume> VolumeProp;
   vtkNew<vtkPolyDataMapper> PolyDataMapper;
   vtkNew<vtkPointGaussianMapper> PointGaussianMapper;
-  vtkNew<vtkSmartVolumeMapper> VolumeMapper;
+  vtkSmartPointer<vtkSmartVolumeMapper> VolumeMapper;
 
   vtkDataSet* Output = nullptr;
   vtkDataSetAttributes* PointDataForColoring = nullptr;
@@ -213,6 +212,12 @@ void vtkF3DGenericImporter::ImportActors(vtkRenderer* ren)
     // Add filter outputs to mapper inputs
     pipe.PolyDataMapper->SetInputConnection(pipe.PostPro->GetOutputPort(0));
     pipe.PointGaussianMapper->SetInputConnection(pipe.PostPro->GetOutputPort(1));
+
+    if (!pipe.VolumeMapper)
+    {
+      pipe.VolumeMapper = vtkSmartPointer<vtkSmartVolumeMapper>::New();
+      pipe.VolumeMapper->SetRequestedRenderModeToGPU();
+    }
     pipe.VolumeMapper->SetInputConnection(pipe.PostPro->GetOutputPort(2));
 
     // Set geometry actor default properties