[FIX #453] initialize slice slider correctly

src/modules/teemGlyphs/WMTeemGlyphs.cpp

@@ -224,6 +224,14 @@ void WMTeemGlyphs::moduleMain()
         }
         if( m_input->getData().get() )
         {
+            bool dataChanged = false;
+            if( m_dataSet != m_input->getData() )
+            {
+                // acquire data from the input connector
+                m_dataSet = m_input->getData();
+                dataChanged = true;
+            }
+
             boost::shared_ptr< WGridRegular3D > gridReg = boost::shared_dynamic_cast< WGridRegular3D >( m_input->getData().get()->getGrid() );
             switch( m_sliceOrientationSelection->get( true ).getItemIndexOfSelected( 0 ) )
             {
@@ -238,6 +246,11 @@ void WMTeemGlyphs::moduleMain()
                     break;
             }
 
+            if( dataChanged )
+            {
+                m_sliceIdProp->set( m_sliceIdProp->getMax()->getMax() / 2 );
+            }
+
             boost::shared_ptr< WDataSetScalar > gfa = m_inputGFA->getData();
             if( gfa )
             {

src/modules/teemGlyphs/WMTeemGlyphs.h

@@ -129,6 +129,8 @@ private:
      */
     void renderSlice( size_t sliceId );
 
+    boost::shared_ptr< WDataSetSphericalHarmonics > m_dataSet; //!< Pointer to the treated data set.
+
     boost::shared_ptr< WModuleInputData< WDataSetScalar > > m_inputGFA; //!< The input for the GFA.
     osg::ref_ptr< WShader > m_shader; //!< The shader used for the glyph surfaces
     boost::shared_ptr< WItemSelection > m_sliceOrientations; //!< A list of the selectable slice orientations, i.e  x, y and z.