BSpline separation

ObjectTypes/BSplineCurve/BSplineCurve.hh

+/*===========================================================================*\
+*                                                                            *
+*                              OpenFlipper                                   *
+ *           Copyright (c) 2001-2015, RWTH-Aachen University                 *
+ *           Department of Computer Graphics and Multimedia                  *
+ *                          All rights reserved.                             *
+ *                            www.openflipper.org                            *
+ *                                                                           *
+ *---------------------------------------------------------------------------*
+ * This file is part of OpenFlipper.                                         *
+ *---------------------------------------------------------------------------*
+ *                                                                           *
+ * Redistribution and use in source and binary forms, with or without        *
+ * modification, are permitted provided that the following conditions        *
+ * are met:                                                                  *
+ *                                                                           *
+ * 1. Redistributions of source code must retain the above copyright notice, *
+ *    this list of conditions and the following disclaimer.                  *
+ *                                                                           *
+ * 2. Redistributions in binary form must reproduce the above copyright      *
+ *    notice, this list of conditions and the following disclaimer in the    *
+ *    documentation and/or other materials provided with the distribution.   *
+ *                                                                           *
+ * 3. Neither the name of the copyright holder nor the names of its          *
+ *    contributors may be used to endorse or promote products derived from   *
+ *    this software without specific prior written permission.               *
+ *                                                                           *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS       *
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED *
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A           *
+ * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER *
+ * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,  *
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,       *
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR        *
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF    *
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING      *
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS        *
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.              *
+*                                                                            *
+\*===========================================================================*/
+
+/*===========================================================================*\
+*                                                                            *
+*   $Revision$                                                       *
+*   $LastChangedBy$                                                *
+*   $Date$                     *
+*                                                                            *
+\*===========================================================================*/
+
+
+//=============================================================================
+//
+// BSPlineCurveIncludes
+// Author:  Ellen Dekkers <dekkers@cs.rwth-aachen.de>
+//
+//=============================================================================
+
+
+/**
+ * \file BSplineCurve.hh
+ * This File contains all required includes for BSpline Curves
+*/
+
+#ifndef BSPLINECURVE_INCLUDE_HH
+#define BSPLINECURVE_INCLUDE_HH
+
+
+//== INCLUDES =================================================================
+
+/** \def DATA_BSPLINE_CURVE
+ * Use this macro to reference B-Spline curves
+ */
+#define DATA_BSPLINE_CURVE typeId("BSplineCurve")
+
+#include <ObjectTypes/BSplineCurve/BSplineCurveT.hh>
+#include <ObjectTypes/BSplineCurve/BSplineCurveObject.hh>
+#include <ObjectTypes/BSplineCurve/PluginFunctionsBSplineCurve.hh>
+#include <ObjectTypes/BSplineCurve/BSplineCurveTypes.hh>
+
+
+//=============================================================================
+#endif // BSPLINECURVE_INCLUDE_HH defined
+//=============================================================================

ObjectTypes/BSplineCurve/BSplineCurveNodeT.hh

+/*===========================================================================*\
+*                                                                            *
+*                              OpenFlipper                                   *
+ *           Copyright (c) 2001-2015, RWTH-Aachen University                 *
+ *           Department of Computer Graphics and Multimedia                  *
+ *                          All rights reserved.                             *
+ *                            www.openflipper.org                            *
+ *                                                                           *
+ *---------------------------------------------------------------------------*
+ * This file is part of OpenFlipper.                                         *
+ *---------------------------------------------------------------------------*
+ *                                                                           *
+ * Redistribution and use in source and binary forms, with or without        *
+ * modification, are permitted provided that the following conditions        *
+ * are met:                                                                  *
+ *                                                                           *
+ * 1. Redistributions of source code must retain the above copyright notice, *
+ *    this list of conditions and the following disclaimer.                  *
+ *                                                                           *
+ * 2. Redistributions in binary form must reproduce the above copyright      *
+ *    notice, this list of conditions and the following disclaimer in the    *
+ *    documentation and/or other materials provided with the distribution.   *
+ *                                                                           *
+ * 3. Neither the name of the copyright holder nor the names of its          *
+ *    contributors may be used to endorse or promote products derived from   *
+ *    this software without specific prior written permission.               *
+ *                                                                           *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS       *
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED *
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A           *
+ * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER *
+ * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,  *
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,       *
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR        *
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF    *
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING      *
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS        *
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.              *
+*                                                                            *
+\*===========================================================================*/
+
+/*===========================================================================*\
+*                                                                            *
+*   $Revision$                                                       *
+*   $LastChangedBy$                                                *
+*   $Date$                     *
+*                                                                            *
+\*===========================================================================*/
+
+
+//=============================================================================
+//
+// CLASS BSplineCurveNodeT
+// Author:  Ellen Dekkers <dekkers@cs.rwth-aachen.de>
+//
+//=============================================================================
+
+
+#ifndef ACG_BSPLINECURVENODET_HH
+#define ACG_BSPLINECURVENODET_HH
+
+
+//== INCLUDES =================================================================
+
+#include <ACG/Scenegraph/BaseNode.hh>
+#include <ACG/Scenegraph/DrawModes.hh>
+
+#include <QGLWidget>
+
+#include <ACG/GL/globjects.hh>
+#include <ACG/GL/VertexDeclaration.hh>
+
+
+//== FORWARDDECLARATIONS ======================================================
+
+//== NAMESPACES ===============================================================
+
+namespace ACG {
+namespace SceneGraph {
+
+//== CLASS DEFINITION =========================================================
+
+/** \class BSPlineCurveNodeT BSplineCurveNodeT.hh <ObjectTypes/BSplineCurve/BSplineCurveNodeT.hh>
+
+    Brief Description.
+
+    A more elaborate description follows.
+*/
+
+template <class BSplineCurve>
+class BSplineCurveNodeT : public BaseNode
+{
+public:
+
+  // typedefs for easy access
+  typedef typename BSplineCurve::Point Point;
+
+  /// Constructor
+  BSplineCurveNodeT(BSplineCurve& _bsc,
+		    BaseNode*    _parent=0,
+		    std::string  _name="<BSplineCurveNode>" ) :
+    BaseNode(_parent, _name),
+    bsplineCurve_(_bsc),
+    pick_radius_(0.1),
+    resolution_(16),
+    polygon_color_( Vec4f(34.f/255.f, 139.f/255.f, 34.f/255.f, 1.f) ),
+    polygon_highlight_color_( Vec4f(1.f, 1.f, 0.f, 1.f) ),
+    curve_color_( Vec4f(178.f/255.f, 34.f/255.f, 34.f/255.f, 1.f) ),
+    curve_highlight_color_( Vec4f(1.f, 1.f, 1.f, 1.f) ),
+    render_control_polygon_(true),
+    render_bspline_curve_(true),
+    bspline_draw_mode_(NORMAL),
+    bspline_selection_draw_mode_(NONE),
+    pick_texture_idx_(0),
+    pick_texture_res_(256),
+    pick_texture_baseidx_(0),
+    cp_selection_texture_idx_(0),
+    cp_selection_texture_res_(256),
+    knot_selection_texture_idx_(0),
+    knot_selection_texture_res_(256),
+    controlPointSelectionTexture_valid_(false),
+    knotVectorSelectionTexture_valid_(false),
+    curveLineVertices_(0),
+    invalidateCurveLine_(true),
+    controlPointSelCount_(0),
+    controlEdgeSelCount_(0),
+    invalidateControlPointVBO_(true),
+    invalidateControlPointSelIBO_(true),
+    invalidateControlEdgeSelIBO_(true)
+  {
+    drawMode(DrawModes::WIREFRAME | DrawModes::POINTS);
+
+    cylinder_    = new GLCylinder(16, 1, 1.0f, true, true);
+    sphere_      = new GLSphere(5, 5);
+    fancySphere_ = new GLSphere(16, 16);
+  }
+
+
+  /// Destructor
+  ~BSplineCurveNodeT()
+  {
+    if (cylinder_)
+      delete cylinder_;
+
+    if (sphere_)
+      delete sphere_;
+
+    if (fancySphere_)
+      delete fancySphere_;
+  }
+
+  
+  enum BSplineDrawMode {
+    NORMAL = 0,
+    FANCY = 1
+  };
+
+  enum BSplineSelectionDrawMode {
+    NONE = 0,
+    CONTROLPOINT = 1,
+    KNOTVECTOR = 2
+  };
+
+
+  BSplineCurve& bsplineCurve() { return bsplineCurve_; }
+
+  void set_pick_radius( double _pr) { pick_radius_ = _pr; }
+
+  /// static name of this class
+  ACG_CLASSNAME(BSplineCurveNodeT);
+
+  /// return available draw modes
+  DrawModes::DrawMode availableDrawModes() const;
+  
+  /// update bounding box
+  void boundingBox(Vec3d& _bbMin, Vec3d& _bbMax);
+
+  /// draw lines and normals
+  void draw(GLState& _state, const DrawModes::DrawMode& _drawMode);
+
+  /// picking
+  void pick(GLState& _state, PickTarget _target);
+
+  void set_rendering_resolution(int _res){resolution_ = _res;};
+
+  void render_control_polygon(bool _render) {render_control_polygon_ = _render;};
+  bool render_control_polygon() {return render_control_polygon_; };
+
+  void render_bspline_curve(bool _render) {render_bspline_curve_ = _render;};
+  bool render_bspline_curve() {return render_bspline_curve_; };
+
+  void set_selection_draw_mode(BSplineSelectionDrawMode _mode) {bspline_selection_draw_mode_ = _mode;};
+  
+  BSplineSelectionDrawMode get_selection_draw_mode() const { return bspline_selection_draw_mode_; }
+
+  void set_bspline_draw_mode(BSplineDrawMode _mode) {bspline_draw_mode_ = _mode;};
+
+  void updateGeometry();
+    
+  //! Should be a power of 2
+  int& pick_texture_res( ) { return pick_texture_res_; }
+  
+  void cpSelectionTextureValid  (bool _valid){controlPointSelectionTexture_valid_ = _valid;};
+  void knotSelectionTextureValid(bool _valid){knotVectorSelectionTexture_valid_   = _valid;};
+
+private:
+
+  void pick_vertices(GLState& _state);
+  void pick_spline( GLState& _state, unsigned int _offset );
+
+  void draw_cylinder( const Point& _p0, const Point& _axis, double _r, GLState& _state);
+  void draw_sphere  ( const Point& _p0, double _r, GLState& _state, GLSphere* _sphere);
+
+  /// Copy constructor (not used)
+  BSplineCurveNodeT(const BSplineCurveNodeT& _rhs);
+
+  /// Assignment operator (not used)
+  BSplineCurveNodeT& operator=(const BSplineCurveNodeT& _rhs);
+
+  
+  void render(GLState& _state, bool _fill, DrawModes::DrawMode _drawMode);
+  
+  void getRenderObjects(IRenderer* _renderer, GLState& _state , const DrawModes::DrawMode& _drawMode , const Material* _mat);
+
+  /// Renders the control polygon
+  void drawControlPolygon(DrawModes::DrawMode _drawMode, GLState& _state);
+  
+  /// Renders the control polygon using cylinders and spheres to include shading effects
+  void drawFancyControlPolygon(DrawModes::DrawMode _drawMode, GLState& _state);
+  
+  /// Renders the spline curve using gluNurbsRenderer
+  void drawCurve(GLState& _state);
+  
+  /// Renders the spline curve by sampling the curve and rendering cylinders in between the samples
+  void drawFancyCurve(GLState& _state);
+
+  /// renders a textured cuve using the gluNurbsRenderer to vilualize either the control point ot the knot vector selection
+  void drawTexturedCurve(GLState& _state, GLuint _texture_idx);
+  
+  /** spline curve picking */
+  /// generate index and setup texture parameters
+  void pick_init_texturing ( );
+  /// create texture image
+  void pick_create_texture( GLState& _state);
+ 
+  void updateControlPointSelectionTexture(GLState& _state);
+  
+  void updateKnotVectorSelectionTexture(GLState& _state);
+  
+  /// generate index and setup texture parameters for selection visualization
+  void selection_init_texturing(GLuint & _texture_idx);
+  
+  /// creates texture to put onto nurbs curve for visualization of control point selection
+  void create_cp_selection_texture(GLState& _state);
+  /// creates texture to put onto nurbs curve for visualization of knotvector selection
+  void create_knot_selection_texture(GLState& _state);
+  
+  /// draw textured nurbs patch
+  void draw_textured_nurbs( GLState& _state);
+  
+  /// generates a color to highlight the curve from the given color
+  ACG::Vec4f generateHighlightColor(ACG::Vec4f _color);
+
+  /// update curve line buffer for drawing
+  void updateCurveBuffer(int _numVertices = 50);
+
+  /// update control point buffer for visualization
+  void updateControlPointBuffer();
+
+  /// update control point selection buffer for visualization
+  void updateControlPointSelBuffer();
+
+  /// update control edge selection buffer for visualization
+  void updateControlEdgeSelBuffer();
+
+
+private:
+
+  BSplineCurve& bsplineCurve_;
+
+  double pick_radius_;
+
+  int resolution_;
+
+  Vec4f polygon_color_;
+  Vec4f polygon_highlight_color_;
+
+  Vec4f curve_color_;
+  Vec4f curve_highlight_color_;
+
+  bool render_control_polygon_;
+  bool render_bspline_curve_;
+
+  BSplineDrawMode bspline_draw_mode_;
+  
+  BSplineSelectionDrawMode bspline_selection_draw_mode_;
+
+  std::vector< std::pair< Vec3d, Vec4f > > curve_samples_;
+  
+  // texturing stuff for picking
+  QImage pick_texture_image_;
+  GLuint pick_texture_idx_;
+  int    pick_texture_res_;
+  // used to only re-create pick_texture_image_ if picking indices changed...
+  unsigned int pick_texture_baseidx_;
+  
+  
+  // texturing stuff for control point selection highlighting
+  QImage cp_selection_texture_image_;
+  GLuint cp_selection_texture_idx_;
+  int    cp_selection_texture_res_;
+
+  // texturing stuff for knot vector selection highlighting
+  QImage knot_selection_texture_image_;
+  GLuint knot_selection_texture_idx_;
+  int    knot_selection_texture_res_;
+
+  bool controlPointSelectionTexture_valid_;
+  bool knotVectorSelectionTexture_valid_;
+  
+  GLCylinder* cylinder_;
+  GLSphere* sphere_;
+  GLSphere* fancySphere_;
+
+
+  // curve line buffers
+  GeometryBuffer curveLineVBO_;
+  VertexDeclaration curveLineDecl_;
+  int curveLineVertices_;
+  bool invalidateCurveLine_; 
+
+
+  // control-point buffers
+  GeometryBuffer controlPointVBO_;
+  VertexDeclaration controlPointDecl_;
+  IndexBuffer controlPointSelIBO_;
+  int controlPointSelCount_;
+  IndexBuffer controlEdgeSelIBO_;
+  int controlEdgeSelCount_;
+  bool invalidateControlPointVBO_;
+  bool invalidateControlPointSelIBO_;
+  bool invalidateControlEdgeSelIBO_;
+};
+
+
+//=============================================================================
+} // namespace SceneGraph
+} // namespace ACG
+//=============================================================================
+#if defined(INCLUDE_TEMPLATES) && !defined(ACG_BSPLINECURVENODET_C)
+#define ACG_BSPLINECURVENODET_TEMPLATES
+#include "BSplineCurveNodeT.cc"
+#endif
+//=============================================================================
+#endif // ACG_BSPLINECURVENODET_HH defined
+//=============================================================================
+

ObjectTypes/BSplineCurve/BSplineCurveObject.cc

+/*===========================================================================*\
+*                                                                            *
+*                              OpenFlipper                                   *
+ *           Copyright (c) 2001-2015, RWTH-Aachen University                 *
+ *           Department of Computer Graphics and Multimedia                  *
+ *                          All rights reserved.                             *
+ *                            www.openflipper.org                            *
+ *                                                                           *
+ *---------------------------------------------------------------------------*
+ * This file is part of OpenFlipper.                                         *
+ *---------------------------------------------------------------------------*
+ *                                                                           *
+ * Redistribution and use in source and binary forms, with or without        *
+ * modification, are permitted provided that the following conditions        *
+ * are met:                                                                  *
+ *                                                                           *
+ * 1. Redistributions of source code must retain the above copyright notice, *
+ *    this list of conditions and the following disclaimer.                  *
+ *                                                                           *
+ * 2. Redistributions in binary form must reproduce the above copyright      *
+ *    notice, this list of conditions and the following disclaimer in the    *
+ *    documentation and/or other materials provided with the distribution.   *
+ *                                                                           *
+ * 3. Neither the name of the copyright holder nor the names of its          *
+ *    contributors may be used to endorse or promote products derived from   *
+ *    this software without specific prior written permission.               *
+ *                                                                           *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS       *
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED *
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A           *
+ * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER *
+ * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,  *
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,       *
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR        *
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF    *
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING      *
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS        *
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.              *
+*                                                                            *
+\*===========================================================================*/
+
+/*===========================================================================*\
+*                                                                            *
+*   $Revision$                                                       *
+*   $LastChangedBy$                                                *
+*   $Date$                     *
+*                                                                            *
+\*===========================================================================*/
+
+
+//=============================================================================
+//
+// BSplineCurve object type - Implementation
+// Author:  Ellen Dekkers <dekkers@cs.rwth-aachen.de>
+//
+//=============================================================================
+
+#define BSPLINECURVEOBJECT_C
+
+//== INCLUDES =================================================================
+
+#include <OpenFlipper/common/Types.hh>
+#include <OpenFlipper/BasePlugin/PluginFunctions.hh>
+#include "BSplineCurve.hh"
+
+//== DEFINES ==================================================================
+
+//== TYPEDEFS =================================================================
+
+//== CLASS DEFINITION =========================================================
+
+/** Constructor for BSpline Objects. This object class gets a Separator Node giving
+*  the root node to which it should be connected. The spline is generated internally
+*  and all nodes for visualization will be added below the scenegraph node.\n
+*  You dont need to create an object of this type manually. Use
+*  PluginFunctions::addBSplineCurve instead. ( see Types.hh::DataType )
+*/
+BSplineCurveObject::BSplineCurveObject() :
+  BaseObjectData(),
+  splineCurve_(NULL),
+  splineCurveNode_(NULL)
+{
+  setDataType(DATA_BSPLINE_CURVE);
+  init();
+}
+
+//-----------------------------------------------------------------------------
+
+/**
+ * Copy Constructor - generates a copy of the given object
+ */
+BSplineCurveObject::BSplineCurveObject(const BSplineCurveObject & _object) :
+BaseObjectData(_object)
+{
+  init(_object.splineCurve_);
+  setName( name() );
+}
+
+//-----------------------------------------------------------------------------
+
+/** Destructor for BSpline Objects. The destructor deletes the spline and all
+*  Scenegraph nodes associated with the spline or the object.
+*/
+BSplineCurveObject::~BSplineCurveObject()
+{
+  // Delete the data attached to this object ( this will remove all perObject data)
+  // Not the best way to do it but it will work.
+  // This is only necessary if people use references to the curve below and
+  // they do something with the splineCurve in the destructor of their
+  // perObjectData.
+  deleteData();
+
+  // Delete the Mesh only, if this object contains a mesh
+  if ( splineCurve_ != NULL)  {
+    delete splineCurve_;
+    splineCurve_ = NULL;
+  } else {
+    std::cerr << "Destructor error : Spline curve already deleted" << std::endl;
+  }
+
+  // No need to delete the scenegraph Nodes as this will be managed by baseplugin
+  splineCurveNode_    = NULL;
+}
+
+//-----------------------------------------------------------------------------
+
+/** Cleanup Function for spline Objects. Deletes the contents of the whole object and
+* calls BSplineObject::init afterwards.
+*/
+void BSplineCurveObject::cleanup()
+{
+  // Delete the spline only, if this object contains a spline
+  if ( splineCurve_ != NULL)  {
+    delete splineCurve_;
+    splineCurve_ = NULL;
+  } else {
+    std::cerr << "Cleanup error : Spline already deleted" << std::endl;
+  }
+
+  BaseObjectData::cleanup();
+
+  splineCurveNode_   = NULL;
+
+  setDataType(DATA_BSPLINE_CURVE);
+
+  init();
+
+}
+
+//-----------------------------------------------------------------------------
+
+/**
+ * Generate a copy
+ */
+BaseObject* BSplineCurveObject::copy()
+{
+  BSplineCurveObject* object = new BSplineCurveObject(*this);
+  return dynamic_cast< BaseObject* >(object);
+}
+
+//-----------------------------------------------------------------------------
+
+/** This function initalizes the spline object. It creates the scenegraph nodes,
+*  the spline.
+*/
+void BSplineCurveObject::init(BSplineCurve* _curve) {
+
+  if (_curve == 0)
+    splineCurve_ = new BSplineCurve();
+  else
+    splineCurve_ = new BSplineCurve(*_curve);
+
+  // request selection properties for control polygon
+  splineCurve()->request_controlpoint_selections();
+  splineCurve()->request_edge_selections();
+  // request selection property for knotvector
+  splineCurve()->get_knotvector_ref()->request_selections();
+
+  if ( materialNode() == NULL)
+