From 484d8e328a58d7677acc4fa955b3f979f78b1fd8 Mon Sep 17 00:00:00 2001
From: Robert Osfield <robert@openscenegraph.com>
Date: Thu, 16 Jul 2009 12:09:47 +0000
Subject: [PATCH] From Fabien Lavignotte,"When exporting some models to
 OpenFlight, i found a crash if the texture unit does not contain a TexEnv
 object. Here's the small fix, just a test on the pointer."

---
 .../OpenFlight/FltExportVisitor.cpp           | 37 ++++++++++---------
 1 file changed, 20 insertions(+), 17 deletions(-)

diff --git a/src/osgPlugins/OpenFlight/FltExportVisitor.cpp b/src/osgPlugins/OpenFlight/FltExportVisitor.cpp
index cb3b53a4c..47e0db85c 100644
--- a/src/osgPlugins/OpenFlight/FltExportVisitor.cpp
+++ b/src/osgPlugins/OpenFlight/FltExportVisitor.cpp
@@ -647,24 +647,27 @@ FltExportVisitor::writeATTRFile( int unit, const osg::Texture2D* texture ) const
         const osg::StateSet* ss = getCurrentStateSet();
         const osg::TexEnv* texenv = dynamic_cast<const osg::TexEnv*>(
             ss->getTextureAttribute( unit, osg::StateAttribute::TEXENV ) );
-        switch( texenv->getMode())
+        if (texenv)
         {
-        case osg::TexEnv::DECAL:
-            ad.texEnvMode = AttrData::TEXENV_DECAL;
-            break;
-        case osg::TexEnv::MODULATE:
-        default:
-            ad.texEnvMode = AttrData::TEXENV_MODULATE;
-            break;
-        case osg::TexEnv::BLEND:
-            ad.texEnvMode = AttrData::TEXENV_BLEND;
-            break;
-        case osg::TexEnv::REPLACE:
-            ad.texEnvMode = AttrData::TEXENV_COLOR;
-            break;
-        case osg::TexEnv::ADD:
-            ad.texEnvMode = AttrData::TEXENV_ADD;
-            break;
+            switch( texenv->getMode())
+            {
+            case osg::TexEnv::DECAL:
+                ad.texEnvMode = AttrData::TEXENV_DECAL;
+                break;
+            case osg::TexEnv::MODULATE:
+            default:
+                ad.texEnvMode = AttrData::TEXENV_MODULATE;
+                break;
+            case osg::TexEnv::BLEND:
+                ad.texEnvMode = AttrData::TEXENV_BLEND;
+                break;
+            case osg::TexEnv::REPLACE:
+                ad.texEnvMode = AttrData::TEXENV_COLOR;
+                break;
+            case osg::TexEnv::ADD:
+                ad.texEnvMode = AttrData::TEXENV_ADD;
+                break;
+            }
         }
 
         osgDB::writeObjectFile( ad, name, _fltOpt.get() );