From 9bf3d2b7cee83952d53d7b5778394a69b7fad208 Mon Sep 17 00:00:00 2001
From: Robert Osfield <robert@openscenegraph.com>
Date: Sat, 9 Dec 2017 11:12:35 +0000
Subject: [PATCH] Pushed background image away from eye point a small amount to
 prevent z fighting with text on the image plane.

---
 src/osgPresentation/SlideShowConstructor.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/osgPresentation/SlideShowConstructor.cpp b/src/osgPresentation/SlideShowConstructor.cpp
index 2ab07cedd..450c67b1a 100644
--- a/src/osgPresentation/SlideShowConstructor.cpp
+++ b/src/osgPresentation/SlideShowConstructor.cpp
@@ -484,7 +484,8 @@ void SlideShowConstructor::addLayer(bool inheritPreviousLayers, bool defineAsBas
             bool useTextureRectangle = true;
             float s = useTextureRectangle ? image->s() : 1.0;
             float t = useTextureRectangle ? image->t() : 1.0;
-            osg::Geometry* backgroundQuad = osg::createTexturedQuadGeometry(_slideOrigin,
+            osg::Vec3 backgroundShift(0.0f, _slideWidth*0.0001f, 0.0f);
+            osg::Geometry* backgroundQuad = osg::createTexturedQuadGeometry(_slideOrigin+backgroundShift,
                                                             osg::Vec3(_slideWidth,0.0f,0.0f),
                                                             osg::Vec3(0.0f,0.0f,_slideHeight),
                                                             s, t);