OgreVolumeDualGridGenerator.h

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/*
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This source file is part of OGRE
(Object-oriented Graphics Rendering Engine)
For the latest info, see http://www.ogre3d.org/

Copyright (c) 2000-2014 Torus Knot Software Ltd

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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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*/
#ifndef __Ogre_Volume_DualGridGenerator_H__
#define __Ogre_Volume_DualGridGenerator_H__

#include <vector>

#include "OgreSceneManager.h"

#include "OgreVolumeOctreeNode.h"
#include "OgreVolumePrerequisites.h"
#include "OgreVolumeIsoSurface.h"

namespace Ogre {
namespace Volume {

    typedef struct _OgreVolumeExport DualCell
    {
    public:
        Vector3 mC0;
        Vector3 mC1;
        Vector3 mC2;
        Vector3 mC3;
        Vector3 mC4;
        Vector3 mC5;
        Vector3 mC6;
        Vector3 mC7;
        DualCell(const Vector3 &c0, const Vector3 &c1, const Vector3 &c2, const Vector3 &c3, const Vector3 &c4, const Vector3 &c5, const Vector3 &c6, const Vector3 &c7) :
            mC0(c0), mC1(c1), mC2(c2), mC3(c3), mC4(c4), mC5(c5), mC6(c6), mC7(c7)
        {
        }
    } DualCell;
    
    typedef vector<DualCell>::type VecDualCell;

    class _OgreVolumeExport DualGridGenerator : public UtilityAlloc
    {
    protected:
        
        static size_t mDualGridI;
        
        Entity* mDualGrid;
        
        OctreeNode const* mRoot;
        
        VecDualCell mDualCells;

        bool mSaveDualCells;

        IsoSurface *mIs;

        MeshBuilder *mMb;

        Real mMaxMSDistance;

        Vector3 mTotalFrom;

        Vector3 mTotalTo;

        inline void addDualCell(const Vector3 &c0, const Vector3 &c1, const Vector3 &c2, const Vector3 &c3, const Vector3 &c4, const Vector3 &c5, const Vector3 &c6, const Vector3 &c7)
        {
            addDualCell(c0, c1, c2, c3, c4, c5, c6, c7, 0);
        }
        
        inline void addDualCell(const Vector3 &c0, const Vector3 &c1, const Vector3 &c2, const Vector3 &c3, const Vector3 &c4, const Vector3 &c5, const Vector3 &c6, const Vector3 &c7,
            Vector4 *values)
        {

            if (mSaveDualCells)
            {
                mDualCells.push_back(DualCell(c0, c1, c2, c3, c4, c5, c6, c7));
            }

            Vector3 corners[8];
            corners[0] = c0;
            corners[1] = c1;
            corners[2] = c2;
            corners[3] = c3;
            corners[4] = c4;
            corners[5] = c5;
            corners[6] = c6;
            corners[7] = c7;
            mIs->addMarchingCubesTriangles(corners, values, mMb);
            Vector3 from = mRoot->getFrom();
            Vector3 to = mRoot->getTo();
            if (corners[0].z == from.z && corners[0].z != mTotalFrom.z)
            {
                mIs->addMarchingSquaresTriangles(corners, values, IsoSurface::MS_CORNERS_BACK, mMaxMSDistance, mMb);
            }
            if (corners[2].z == to.z && corners[2].z != mTotalTo.z)
            {
                mIs->addMarchingSquaresTriangles(corners, values, IsoSurface::MS_CORNERS_FRONT, mMaxMSDistance, mMb);
            }
            if (corners[0].x == from.x && corners[0].x != mTotalFrom.x)
            {
                mIs->addMarchingSquaresTriangles(corners, values, IsoSurface::MS_CORNERS_LEFT, mMaxMSDistance, mMb);
            }
            if (corners[1].x == to.x && corners[1].x != mTotalTo.x)
            {
                mIs->addMarchingSquaresTriangles(corners, values, IsoSurface::MS_CORNERS_RIGHT, mMaxMSDistance, mMb);
            }
            if (corners[5].y == to.y && corners[5].y != mTotalTo.y)
            {
                mIs->addMarchingSquaresTriangles(corners, values, IsoSurface::MS_CORNERS_TOP, mMaxMSDistance, mMb);
            }
            if (corners[0].y == from.y && corners[0].y != mTotalFrom.y)
            {
                mIs->addMarchingSquaresTriangles(corners, values, IsoSurface::MS_CORNERS_BOTTOM, mMaxMSDistance, mMb);
            }
        }

        /* Startpoint for the creation recursion.
        @param n
            The node to start with.
        */
        void nodeProc(const OctreeNode *n);

        /* faceProc with variing X and Y of the nodes, see the paper for faceProc().
            Direction of parameters: Z+ (n0 and n3 for example of parent cell)
        @param n0
            The first node.
        @param n1
            The second node.
        */
        void faceProcXY(const OctreeNode *n0, const OctreeNode *n1);

        /* faceProc with variing Z and Y of the nodes, see the paper for faceProc().
            Direction of parameters: X+ (n0 and n1 for example of parent cell)
        @param n0
            The first node.
        @param n1
            The second node.
        */
        void faceProcZY(const OctreeNode *n0, const OctreeNode *n1);

        /* faceProc with variing X and Z of the nodes, see the paper for faceProc().
            Direction of parameters: Y- (n4 and n0 for example of parent cell)
        @param n0
            The first node.
        @param n1
            The second node.
        */
        void faceProcXZ(const OctreeNode *n0, const OctreeNode *n1);

        void edgeProcX(const OctreeNode *n0, const OctreeNode *n1, const OctreeNode *n2, const OctreeNode *n3);

        void edgeProcY(const OctreeNode *n0, const OctreeNode *n1, const OctreeNode *n2, const OctreeNode *n3);

        void edgeProcZ(const OctreeNode *n0, const OctreeNode *n1, const OctreeNode *n2, const OctreeNode *n3);

        /* vertProc of the nodes, see the paper for vertProc. Difference to the paper: The cells to the
            octree border are already created here and not with another traversion.
        @param n0
            The first node.
        @param n1
            The second node.
        @param n3
            The third node.
        @param n4
            The fourth node.
        @param n5
            The fifth node.
        @param n6
            The sixth node.
        @param n7
            The seventh node.
        */
        void vertProc(const OctreeNode *n0, const OctreeNode *n1, const OctreeNode *n2, const OctreeNode *n3, const OctreeNode *n4, const OctreeNode *n5, const OctreeNode *n6, const OctreeNode *n7);
        
        /* Creates the bordercells.
        @param n0
            The first node.
        @param n1
            The second node.
        @param n3
            The third node.
        @param n4
            The fourth node.
        @param n5
            The fifth node.
        @param n6
            The sixth node.
        @param n7
            The seventh node.
        */
        void createBorderCells(const OctreeNode *n0, const OctreeNode *n1, const OctreeNode *n2, const OctreeNode *n3, const OctreeNode *n4, const OctreeNode *n5, const OctreeNode *n6, const OctreeNode *n7);

   public:

        DualGridGenerator(void);

        void generateDualGrid(const OctreeNode *root, IsoSurface *is, MeshBuilder *mb, Real maxMSDistance, const Vector3 &totalFrom, const Vector3 &totalTo, bool saveDualCells);

        Entity* getDualGrid(SceneManager *sceneManager);

        inline size_t getDualCellCount(void) const
        {
            return mDualCells.size();
        }

        inline DualCell getDualCell(size_t i) const
        {
            return mDualCells[i];
        }
    };
}
}

#endif