From b0ca6de657adeb9793466a4f1f297070ce3d0d19 Mon Sep 17 00:00:00 2001
From: Robert Osfield <robert@openscenegraph.com>
Date: Fri, 3 Jun 2011 15:58:36 +0000
Subject: [PATCH] Added support for --tf-255 transfer function files

---
 examples/osgvolume/osgvolume.cpp | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/examples/osgvolume/osgvolume.cpp b/examples/osgvolume/osgvolume.cpp
index 4a1a6a71d..b28214d7d 100644
--- a/examples/osgvolume/osgvolume.cpp
+++ b/examples/osgvolume/osgvolume.cpp
@@ -842,7 +842,7 @@ osg::Image* doColourSpaceConversion(ColourSpaceOperation op, osg::Image* image,
 }
 
 
-osg::TransferFunction1D* readTransferFunctionFile(const std::string& filename)
+osg::TransferFunction1D* readTransferFunctionFile(const std::string& filename, float colorScale=1.0f)
 {
     std::string foundFile = osgDB::findDataFile(filename);
     if (foundFile.empty())
@@ -862,7 +862,7 @@ osg::TransferFunction1D* readTransferFunctionFile(const std::string& filename)
         if (fin)
         {
             std::cout<<"value = "<<value<<" ("<<red<<", "<<green<<", "<<blue<<", "<<alpha<<")"<<std::endl;
-            colorMap[value] = osg::Vec4(red,green,blue,alpha);
+            colorMap[value] = osg::Vec4(red*colorScale,green*colorScale,blue*colorScale,alpha*colorScale);
         }
     }
 
@@ -1051,6 +1051,10 @@ int main( int argc, char **argv )
     {
         transferFunction = readTransferFunctionFile(tranferFunctionFile);
     }
+    while (arguments.read("--tf-255",tranferFunctionFile))
+    {
+        transferFunction = readTransferFunctionFile(tranferFunctionFile,1.0f/255.0f);
+    }
 
     while(arguments.read("--test"))
     {