[CHANGE] - final TF construction example. Will be done by a GUI later.

src/modules/directVolumeRendering/WMDirectVolumeRendering.cpp

@@ -31,6 +31,7 @@
 #include <osg/ShapeDrawable>
 #include <osg/StateAttribute>
 #include <osgDB/ReadFile>
+#include <osgDB/WriteFile>
 
 #include "../../common/WColor.h"
 #include "../../common/WPropertyHelper.h"

src/modules/directVolumeRendering/shaders/WMDirectVolumeRendering-fragment.glsl

@@ -29,7 +29,7 @@
 #endif
 
 // This is needed if the modulo operator % is required
-// #extension GL_EXT_gpu_shader4 : enable
+#extension GL_EXT_gpu_shader4 : enable
 
 #include "WGEUtils.glsl"
 
@@ -130,34 +130,25 @@ vec4 transferFunction( float value )
 #ifdef TRANSFERFUNCTION_ENABLED
     return texture1D( u_transferFunctionSampler, value );
 #else
-    if ( isZero( value - 0.5, 0.01 ) )   // if not TF has been specified, at least show something
-    {
-        return vec4( 1.0, 0.0, 0.0, 0.1 );
-    }
-    else
-    {
-        return vec4( 0.0 );
-    }
     // Example TF
-    /*if ( isZero( value - 0.5, 0.005  ) )
+    if ( isZero( value - 0.5, 0.00005  ) )
         return vec4( 0.0 );
     vec4 c = vec4( 0.0 );
-    if ( value >= 0.5 )
+    if ( value <= 0.5 )
     {
-        c = vec4( 1.0, 0.34, 0.34, 2.0 * ( value - 0.5 ) );
+        c = vec4( 0.0, 0.37, 1.0, 2.0 * ( 0.5 - value ) );
     }
     else
     {
         vec4 cols[2];
-        cols[1] = vec4( 0.0, 0.37, 1.0, 0.1 );
-        cols[0] = vec4( 0.0, 1.0, 1.0, 0.1 );
+        cols[0] = vec4( 1.0, 0.34, 0.34, 0.25 );
+        cols[1] = vec4( 1.0, 0.75, 0.0, 0.25 );
 
-        int i = int(2.0 * value * 2.0 * 15.0);
+        int i = int( 2.0 * ( value - 0.5 ) * 2.0 * 15.0);
         int imod = i % 2;
         c = cols[ imod ];
     }
     return c;
-    */
 #endif
 }