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//
// Filename : ViewMapBuilder.h
// Author(s) : Stephane Grabli
// Purpose : Class to build silhouette edges from a
// Winged-Edge structure
// Date of creation : 25/03/2002
//
///////////////////////////////////////////////////////////////////////////////
//
// Copyright (C) : Please refer to the COPYRIGHT file distributed
// with this source distribution.
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation; either version 2
// of the License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
//
///////////////////////////////////////////////////////////////////////////////
#ifndef VIEWMAPBUILDER_H
# define VIEWMAPBUILDER_H
# include <vector>
# include "../system/FreestyleConfig.h"
# include "../geometry/Geom.h"
# include "../scene_graph/NodeGroup.h"
# include "../winged_edge/WXEdge.h"
# include "Silhouette.h"
# include "../geometry/GeomUtils.h"
# include "../geometry/Grid.h"
# include "../system/ProgressBar.h"
# include "../geometry/SweepLine.h"
# include "ViewMap.h"
# include "SilhouetteGeomEngine.h"
# include "../scene_graph/TriangleRep.h"
# include "../winged_edge/WEdge.h"
# include "ViewEdgeXBuilder.h"
using namespace Geometry;
class LIB_VIEW_MAP_EXPORT ViewMapBuilder
{
private:
ViewMap * _ViewMap; // result
//SilhouetteGeomEngine _GeomEngine;
ProgressBar *_pProgressBar;
Vec3r _viewpoint;
Grid* _Grid;
ViewEdgeXBuilder *_pViewEdgeBuilder;
bool _EnableQI;
double _epsilon;
// tmp values:
int _currentId;
int _currentFId;
int _currentSVertexId;
public:
typedef enum {
sweep_line
} intersection_algo;
typedef enum {
ray_casting,
ray_casting_fast,
ray_casting_very_fast
} visibility_algo;
inline ViewMapBuilder()
{
_pProgressBar = 0;
_Grid = 0;
_currentId = 1;
_currentFId = 0;
_currentSVertexId = 0;
_pViewEdgeBuilder = new ViewEdgeXBuilder;
_EnableQI = true;
}
inline ~ViewMapBuilder()
{
if(_pViewEdgeBuilder){
delete _pViewEdgeBuilder;
_pViewEdgeBuilder = 0;
}
}
/*! Compute Shapes from a WingedEdge containing a list of WShapes */
void computeInitialViewEdges(WingedEdge&);
/*! Compute Cusps */
void computeCusps(ViewMap *ioViewMap);
/*! Detects cusps (for a single ViewEdge) among SVertices and builds a ViewVertex on top of
* each cusp SVertex
* We use a hysteresis approach to avoid noise.
*/
void DetectCusps(ViewEdge *ioEdge);
/*! Sets the current viewpoint */
inline void SetViewpoint(const Vec3r& ivp) {_viewpoint = ivp; SilhouetteGeomEngine::SetViewpoint(ivp);}
/*! Sets the current transformation
* iModelViewMatrix
* The 4x4 model view matrix, in column major order (openGL like).
* iProjection matrix
* The 4x4 projection matrix, in column major order (openGL like).
* iViewport
* The viewport. 4 real array: origin.x, origin.y, width, length
*/
inline void SetTransform(const real iModelViewMatrix[4][4],
const real iProjectionMatrix[4][4],
const int iViewport[4],
real iFocalLength,
real iAspect,
real iFovy) {
SilhouetteGeomEngine::SetTransform(iModelViewMatrix, iProjectionMatrix, iViewport, iFocalLength);
}
inline void SetFrustum(real iZnear, real iZfar) {
SilhouetteGeomEngine::SetFrustum(iZnear, iZfar);
}
/*! Builds the scene view map
* returns the list the view map
* it is up to the caller to delete this ViewMap
* iWRoot
* The root group node containing the WEdge structured scene
*/
ViewMap* BuildViewMap(WingedEdge& we, visibility_algo iAlgo = ray_casting, real epsilon=1e-06) ;
/*! computes the intersection between all 2D
* feature edges of the scene.
* ioViewMap
* The view map. It is modified by the method.
* The list of all features edges of the scene.
* Each time an intersection is found, the 2 intersecting
* edges are splitted (creating 2 new vertices)
* At the end, this list is updated with the adding
* of all new created edges (resulting from splitting).
* iAlgo
* The algo to use for computing the intersections
*/
void ComputeIntersections(ViewMap *ioViewMap, intersection_algo iAlgo = sweep_line, real epsilon=1e-06);
/*! Computes the 2D scene silhouette edges visibility
* iGrid
* For the Ray Casting algorithm.
*/
void ComputeEdgesVisibility(ViewMap *ioViewMap, visibility_algo iAlgo= ray_casting, Grid* iGrid = 0, real epsilon=1e-6);
void SetGrid(Grid *iGrid) {_Grid = iGrid;}
/*! accessors */
/*! Modifiers */
inline void SetProgressBar(ProgressBar *iProgressBar) {_pProgressBar = iProgressBar;}
inline void SetEnableQI(bool iBool) {_EnableQI = iBool;}
protected:
/*! Computes intersections on all edges of the scene using a sweep line
* algorithm*/
void ComputeSweepLineIntersections(ViewMap *ioViewMap, real epsilon = 1e-6);
/*! Computes the 2D scene silhouette edges visibility
* using a ray casting. On each edge, a ray is cast
* to check its quantitative invisibility. The list
* of occluders are each time stored in the tested edge.
* ioViewMap
* The view map.
* The 2D scene silhouette edges as FEdges.
* These edges have already been splitted at their intersections points.
* Thus, these edges do not intersect anymore.
* The visibility corresponding to each edge of ioScene is set is this
* edge.
*/
void ComputeRayCastingVisibility(ViewMap *ioViewMap, Grid *iGrid, real epsilon=1e-6);
void ComputeFastRayCastingVisibility(ViewMap *ioViewMap, Grid *iGrid, real epsilon=1e-6);
void ComputeVeryFastRayCastingVisibility(ViewMap *ioViewMap, Grid *iGrid, real epsilon=1e-6);
/*! Compute the visibility for the FEdge fe.
* The occluders are added to fe occluders list.
* fe
* The FEdge
* iGrid
* The grid used to compute the ray casting visibility
* epsilon
* The epsilon used for computation
* oShapeId
* fe is the border (in 2D) between 2 2D spaces.
* if fe is a silhouette,
* One of these 2D spaces is occupied by the shape
* to which fe belongs (on its left) and the other one is either occupied
* by another shape or empty or occupied by the same shape.
* We use this ray csating operation to determine which shape
* lies on fe's right.
* The result is the shape id stored in oShapeId
*/
int ComputeRayCastingVisibility(FEdge *fe, Grid* iGrid, real epsilon, set<ViewShape*>& oOccluders,
Polygon3r** oaPolygon, unsigned timestamp);
// FIXME
void FindOccludee(FEdge *fe, Grid* iGrid, real epsilon, Polygon3r** oaPolygon, unsigned timestamp);
void FindOccludee(FEdge *fe, Grid* iGrid, real epsilon, Polygon3r** oaPolygon, unsigned timestamp,
Vec3r& u, Vec3r& A, Vec3r& origin, Vec3r& edge, vector<WVertex*>& faceVertices);
};
#endif // VIEWMAPBUILDER_H
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