From d13bfb522b37343d2f3cb9ccb3dd1bacfaf5478e Mon Sep 17 00:00:00 2001
From: Robert Osfield <robert@openscenegraph.com>
Date: Fri, 11 Nov 2011 10:25:20 +0000
Subject: [PATCH] Enabled blending for the iso surface rendering to enable fade
 in/fade out of volume.

---
 src/osgVolume/RayTracedTechnique.cpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/osgVolume/RayTracedTechnique.cpp b/src/osgVolume/RayTracedTechnique.cpp
index 752c210c9..ab0fac8de 100644
--- a/src/osgVolume/RayTracedTechnique.cpp
+++ b/src/osgVolume/RayTracedTechnique.cpp
@@ -319,6 +319,8 @@ void RayTracedTechnique::init()
         else if (shadingModel==Isosurface)
         {
 
+            enableBlending = true;
+
             stateset->addUniform(cpv._isoProperty->getUniform());
 
             if (tf)