From 30478f0fefa1a49ac532e0b5d9f513560b48d8af Mon Sep 17 00:00:00 2001
From: Robert Osfield <robert@openscenegraph.com>
Date: Mon, 19 Sep 2005 15:33:25 +0000
Subject: [PATCH] From Mike Weiblen: support for OSGHANGGLIDE_REVERSE_CONTROLS
 env which reverses the pitch and roll control to account from Mike's "unique"
 way of flying hang gliders :-)

---
 examples/osghangglide/GliderManipulator.cpp | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/examples/osghangglide/GliderManipulator.cpp b/examples/osghangglide/GliderManipulator.cpp
index 8db27bd3e..e0cfb68bc 100644
--- a/examples/osghangglide/GliderManipulator.cpp
+++ b/examples/osghangglide/GliderManipulator.cpp
@@ -260,6 +260,12 @@ bool GliderManipulator::calcMovement()
     float dx = _ga_t0->getXnormalized();
     float dy = _ga_t0->getYnormalized();
 
+    // mew - flag to reverse mouse-control mapping
+    if( getenv( "OSGHANGGLIDE_REVERSE_CONTROLS" ) )
+    {
+        dx = -dx;
+        dy = -dy;
+    }
 
     osg::Matrixd rotation_matrix;
     rotation_matrix.makeRotate(_rotation);