DtOsgIntersector.h

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/******************************************************************************
** Copyright (c) 2022 MAK Technologies, Inc.
** All rights reserved.
******************************************************************************/


#pragma once

#include <vrvOsg/vrvOsg.h>
#include <vrvOsg/DtOsgIntersectorResult.h>
#include <vrvOsg/DtOsgNodeTraversalFlags.h>
#include <vrvOsg/DtOsgRenderer.h>

#include <vrvCore/DtIntersector.h>
#include <vrvCore/DtIntersectorCreator.h>

#include <osgUtil/LineSegmentIntersector>
#include <osgUtil/IntersectVisitor>

#include <osg/Node>

#include <matrix/vlVector.h>

#include <vector>

namespace osgUtil
{
   class Hit;
}

namespace osgViewer
{
   class View;
}

namespace makVrv
{
   class DtOsgRenderer;
   class DtOsgIntersectionVisitor;
   class DtIntersectorManager;

   class DT_DLL_VRVOSG DtOsgItersectorExclusions
   {
   public:
      std::list<DtUniqueID> myExcludeIds;
      std::list<osg::Node*> myExcludeNodes;
   };



   class DT_DLL_VRVOSG DtOsgIntersector : public DtIntersector
   {
   public:
         
      // Abstract DtIntersector Implementation for OSG
       
      DtOsgIntersector( DtDe& de, int modelSet );
      
      virtual ~DtOsgIntersector();
      
      DtOsgIntersector() = delete;
      DtOsgIntersector( const DtOsgIntersector& rhs ) = delete;
      DtOsgIntersector& operator=( const DtOsgIntersector& rhs ) = delete;

      virtual bool findNearestIntersectionToPoint(double x, double y, double z,
         double vx, double vy, double vz,
         DtIntersectorResult& intersection,
         IntersectProperties properties=AllNodes, 
         std::vector<DtElementID>* ignoreList=0,
         bool returnTriangle=false,
         double maxIsectorLength=-1., bool useHighLod=false ) override;
                 
      virtual bool findAllIntersectionsThroughPoint( double x, double y, double z,
         double vx, double vy, double vz, DtIntersections& intersections, 
         IntersectProperties properties=AllNodes, 
         std::vector<DtElementID>* ignoreList=0, bool sort=true, bool useHighLod=false ) override;
          
      virtual bool findFirstIntersectWithLineSegment( 
         double x, double y, double z, double end_x, double end_y, double end_z,
         DtIntersectorResult& intersection, 
         IntersectProperties properties=AllNodes, 
         std::vector<DtElementID>* ignoreList=0, bool useHighLod=false) override;
          
      virtual bool findAllIntersectWithLineSegment( 
         double x, double y, double z, double end_x, double end_y, double end_z,
         DtIntersections& intersections, 
         IntersectProperties properties=AllNodes, 
         std::vector<DtElementID>* ignoreList=0, bool sort=true, bool useHighLod=false ) override;
                 
      virtual bool pick( DtChannel& channel, double mx, double my, 
         DtIntersectorResult& intersection, 
         IntersectProperties properties=AllNodes, 
         std::vector<DtElementID>* ignoreList=0) override;
         
      virtual bool pickAll( DtChannel* channel, double mx, double my, 
         DtIntersections& intersections, IntersectProperties properties=AllNodes, 
         std::vector<DtElementID>* ignoreList=0) override;
         
   public:
   
      // OSG-specific Interface


  
      typedef std::vector<DtOsgIntersectorResult> DtOsgIntersections;
      
         

      virtual bool findNearestIntersection(double x, double y, double z,
         double vx, double vy, double vz, DtOsgIntersectorResult& intersection,
         const DtSceneRootList& intersectionRoots, 
         osg::Node::NodeMask mask=DtOsgNodeFlags::FlagAllOn,
         DtOsgItersectorExclusions* excludeNodeList=0, bool returnHitTriangle=false, 
         double maxIsectorLength=-1.0, bool useHighLod=false );
      
      virtual bool findIntersectionsThroughPoint(double x, double y, double z,
         double vx, double vy, double vz, 
         DtOsgIntersector::DtOsgIntersections& intersections,
         const DtSceneRootList& intersectionRoots,
         osg::Node::NodeMask mask=DtOsgNodeFlags::FlagAllOn, 
         DtOsgItersectorExclusions* exclusions=0, bool returnHitTriangle=false, 
         double maxIsectorLength=-1.0, bool sort=true, bool useHighLod=false );
 
      virtual bool intersectLineSegmentWithScene( double x, double y, double z,
         double end_x, double end_y, double end_z,
         DtOsgIntersectorResult& intersection, 
         const DtSceneRootList& intersectionRoots,
         osg::Node::NodeMask mask=DtOsgNodeFlags::FlagAllOn, 
         DtOsgItersectorExclusions* excludeNodeList=0,
         bool returnHitTriangle=false, bool useHighLod=false );
 
      virtual bool intersectLineSegmentWithScene( double x, double y, double z,
         double end_x, double end_y, double end_z,
         DtOsgIntersector::DtOsgIntersections& intersections, 
         const DtSceneRootList& intersectionRoots,
         osg::Node::NodeMask mask=DtOsgNodeFlags::FlagAllOn, 
         DtOsgItersectorExclusions* excludeNodeList=0,
         bool returnHitTriangle=false, bool sort=true, bool useHighLod=false );
         
      virtual bool pick(const osgViewer::View& view, double mx, double my,
         DtOsgIntersectorResult& intersection,
         osg::Node::NodeMask mask=DtOsgNodeFlags::FlagAllOn,
         DtOsgItersectorExclusions* excludeNodeList=0,
         bool returnHitTriangle=false );
         
      virtual bool pick(const osgViewer::View& view, double mx, double my,
         DtOsgIntersector::DtOsgIntersections& intersections,
         osg::Node::NodeMask mask=DtOsgNodeFlags::FlagAllOn,
         DtOsgItersectorExclusions* excludeNodeList=0,
         bool returnHitTriangle=false );  

   public:
      
      static osg::Node::NodeMask nodeMaskFromIntersectProperties(
         IntersectProperties properties );
     
      static bool anyNodeInNodePath(std::list<osg::Node*>* n, 
         osg::NodePath const& path);    
        
   protected:

      virtual float distanceToResult2(double x, double y, double z, DtOsgIntersectorResult& result);

      virtual bool calcEndpointsFromDirectionAndLength( double x, double y, 
         double z, double vx, double vy, double vz, double length, 
         const DtSceneRootList& intersectionRoots, DtVector& startPoint, 
         DtVector& endPoint ) const;

      virtual void calculateStartEnd(DtVector& start, DtVector& end
         , const osgViewer::View& view, double mx, double my) const;

      virtual void calculateStartEnd(DtVector& start, DtVector& end
         , const osg::Camera* osgCamera, double mx, double my) const;
         
      virtual const osg::Camera * getActiveCamera(const osgViewer::View& view) const;
          
      void getExcludeNodesFromIgnoreList( std::vector<DtUniqueID>* ignoreList,
         DtOsgItersectorExclusions& exclusions );   
     
      osg::Vec3d worldIntersectPoint( const osgUtil::Hit& hit ); 
      
      osg::Vec3d worldIntersectPoint( 
         const osgUtil::LineSegmentIntersector::Intersection& hit ); 
         
      osg::Vec3d localToWorld( const osg::Vec3& local, const osg::Matrix& localToWorld ); 
   
      bool findIdFromNodePath( const osg::NodePath& nodePath, DtUniqueID& id );

      void updateInstanceIntersectElementId(DtOsgIntersectorResult &result);
         
      bool fillResultFromHit(DtOsgIntersectorResult& result,  
         const osgUtil::LineSegmentIntersector::Intersection& hit, 
         bool returnHitTriangle ) ;
      
      void doLineSegmentIntersections(
         osgUtil::IntersectionVisitor& collisionVisitor, 
         const DtSceneRootList& intersectionRoots, osg::Node::NodeMask mask);
         
      bool processLineSegmentIntersection( 
         osgUtil::LineSegmentIntersector::Intersections& hitList,
         DtOsgItersectorExclusions* excludeNodeList, bool returnHitTriangle, 
         DtOsgIntersectorResult& intersection );
         
       bool processLineSegmentIntersection( const osg::Vec3d& testPoint,
         osgUtil::LineSegmentIntersector::Intersections& hitList,
         DtOsgItersectorExclusions* excludeNodeList, bool returnHitTriangle, 
         DtOsgIntersectorResult& intersection );
     
      bool processLineSegmentIntersection( const osg::Vec3d& testPoint, 
         osgUtil::LineSegmentIntersector::Intersections& hitList,
         DtOsgItersectorExclusions* excludeNodeList, bool returnHitTriangle, 
         DtOsgIntersector::DtOsgIntersections& intersections, bool sort );
      
      bool processPickIntersection( 
         osgUtil::LineSegmentIntersector::Intersections& hitList,
         DtOsgItersectorExclusions* excludeNodeList, bool returnHitTriangle, 
         DtOsgIntersectorResult& intersection );
         
      bool processPickIntersection( 
         osgUtil::LineSegmentIntersector::Intersections& hitList,
         DtOsgItersectorExclusions* excludeNodeList, bool returnHitTriangle, 
         DtOsgIntersector::DtOsgIntersections& intersections );

      void setupCollisionVisitor( bool useHighLod, DtOsgIntersectionVisitor& visitor );

      bool shouldInstanceIntersect(osg::Node::NodeMask nodeMask);
   };

   class DtOsgIntersectorSorter
   {
   public:
      DtOsgIntersectorSorter( const osg::Vec3d& reference )
      : myReference( reference ) {}
      
      inline bool operator() ( const DtOsgIntersectorResult& a, 
         const DtOsgIntersectorResult& b )
      {
         osg::Vec3d diffA = osg::Vec3d(a.x, a.y, a.z) - myReference;
         osg::Vec3d diffB = osg::Vec3d(b.x, b.y, b.z) - myReference;
         return diffA.length2() < diffB.length2();
      }
   protected:
      osg::Vec3d myReference;
   };
   
   class DT_DLL_VRVOSG DtOsgIntersectorCreator : public DtIntersectorCreator
   {
   public:   
      virtual DtIntersector* create(DtDe& de, int modelSet );
   };
}