Horde3D

        //...
        H3DNode rigNode= h3dAddNodes( H3DRootNode, MyRigResource );

        std::string MyCustomJointName="..."

        //retrieves all joints
   int countNodes=h3dFindNodes( rigNode, "", H3DNodeTypes::Joint);

   for(int index=0 ; index<countNodes ; ++index)
   {
      H3DNode joint=h3dGetNodeFindResult( index );
               
                // find a way to compare the horde3D joint name with my custom joints data
                if ( h3dGetNodeParamStr(joint,MyCustomJointName) )
                  {
                float x = h3dGetNodeParamF(joint,H3DGeoRes::GeoVertPosStream,0);
                float y = h3dGetNodeParamF(joint,H3DGeoRes::GeoVertPosStream,1);
                float z = h3dGetNodeParamF(joint,H3DGeoRes::GeoVertPosStream,2);

                           h3dSetNodeParamF(joint,H3DGeoRes::GeoVertPosStream,x*2.0);
                 h3dSetNodeParamF(joint,H3DGeoRes::GeoVertPosStream,y*2.5);
                 h3dSetNodeParamF(joint,H3DGeoRes::GeoVertPosStream,z*1.5);
                  }
   }