From 3ce01d3e5dd94a96f249fd81c6b37717b702d37d Mon Sep 17 00:00:00 2001
From: rnv <rnv@opencascade.com>
Date: Fri, 2 Apr 2021 05:28:59 +0300
Subject: [PATCH] [CEA 24030] ParaView 5.9: fixing a problem with Viewer
 background transparency

---
 src/VTKViewer/VTKViewer_OpenGLRenderer.cxx | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/VTKViewer/VTKViewer_OpenGLRenderer.cxx b/src/VTKViewer/VTKViewer_OpenGLRenderer.cxx
index f0af96f50..d6eb0e78a 100644
--- a/src/VTKViewer/VTKViewer_OpenGLRenderer.cxx
+++ b/src/VTKViewer/VTKViewer_OpenGLRenderer.cxx
@@ -112,7 +112,7 @@ void VTKViewer_OpenGLRenderer::Clear(void)
     glClearColor( static_cast<GLclampf>(this->Background[0]),
                   static_cast<GLclampf>(this->Background[1]),
                   static_cast<GLclampf>(this->Background[2]),
-                  static_cast<GLclampf>(0.0));
+                  static_cast<GLclampf>(1.0));
     clear_mask |= GL_COLOR_BUFFER_BIT;
   }
 
-- 
2.39.2