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# SViewFrustum.h

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    00001 // Copyright (C) 2002-2009 Nikolaus Gebhardt
    00002 // This file is part of the "Irrlicht Engine".
    00003 // For conditions of distribution and use, see copyright notice in irrlicht.h
    00004
    00005 #ifndef __S_VIEW_FRUSTUM_H_INCLUDED__
    00006 #define __S_VIEW_FRUSTUM_H_INCLUDED__
    00007
    00008 #include "plane3d.h"
    00009 #include "vector3d.h"
    00010 #include "line3d.h"
    00011 #include "aabbox3d.h"
    00012 #include "matrix4.h"
    00013 #include "IVideoDriver.h"
    00014
    00015 namespace irr
    00016 {
    00017 namespace scene
    00018 {
    00019
    00021
    00025         struct SViewFrustum
    00026         {
    00027                 enum VFPLANES
    00028                 {
    00030                         VF_FAR_PLANE = 0,
    00032                         VF_NEAR_PLANE,
    00034                         VF_LEFT_PLANE,
    00036                         VF_RIGHT_PLANE,
    00038                         VF_BOTTOM_PLANE,
    00040                         VF_TOP_PLANE,
    00041
    00043                         VF_PLANE_COUNT
    00044                 };
    00045
    00046
    00048                 SViewFrustum() {}
    00049
    00051                 SViewFrustum(const SViewFrustum& other);
    00052
    00054                 SViewFrustum(const core::matrix4& mat);
    00055
    00057                 inline void setFrom(const core::matrix4& mat);
    00058
    00060
    00061                 void transform(const core::matrix4& mat);
    00062
    00064                 core::vector3df getFarLeftUp() const;
    00065
    00067                 core::vector3df getFarLeftDown() const;
    00068
    00070                 core::vector3df getFarRightUp() const;
    00071
    00073                 core::vector3df getFarRightDown() const;
    00074
    00076                 const core::aabbox3d<f32> &getBoundingBox() const;
    00077
    00079                 inline void recalculateBoundingBox();
    00080
    00082                 core::matrix4& getTransform( video::E_TRANSFORMATION_STATE state);
    00083
    00085                 const core::matrix4& getTransform( video::E_TRANSFORMATION_STATE state) const;
    00086
    00088
    00089                 bool clipLine(core::line3d<f32>& line) const;
    00090
    00092                 core::vector3df cameraPosition;
    00093
    00095                 core::plane3d<f32> planes[VF_PLANE_COUNT];
    00096
    00098                 core::aabbox3d<f32> boundingBox;
    00099
    00100         private:
    00102                 enum E_TRANSFORMATION_STATE_FRUSTUM
    00103                 {
    00104                         ETS_VIEW = 0,
    00105                         ETS_PROJECTION = 1,
    00106                         ETS_COUNT_FRUSTUM
    00107                 };
    00108
    00110                 core::matrix4 Matrices[ETS_COUNT_FRUSTUM];
    00111         };
    00112
    00113
    00117         inline SViewFrustum::SViewFrustum(const SViewFrustum& other)
    00118         {
    00119                 cameraPosition=other.cameraPosition;
    00120                 boundingBox=other.boundingBox;
    00121
    00122                 u32 i;
    00123                 for (i=0; i<VF_PLANE_COUNT; ++i)
    00124                         planes[i]=other.planes[i];
    00125
    00126                 for (i=0; i<ETS_COUNT_FRUSTUM; ++i)
    00127                         Matrices[i]=other.Matrices[i];
    00128         }
    00129
    00130         inline SViewFrustum::SViewFrustum(const core::matrix4& mat)
    00131         {
    00132                 setFrom ( mat );
    00133         }
    00134
    00135
    00136         inline void SViewFrustum::transform(const core::matrix4& mat)
    00137         {
    00138                 for (u32 i=0; i<VF_PLANE_COUNT; ++i)
    00139                         mat.transformPlane(planes[i]);
    00140
    00141                 mat.transformVect(cameraPosition);
    00142                 recalculateBoundingBox();
    00143         }
    00144
    00145
    00146         inline core::vector3df SViewFrustum::getFarLeftUp() const
    00147         {
    00148                 core::vector3df p;
    00149                 planes[scene::SViewFrustum::VF_FAR_PLANE].getIntersectionWithPlanes(
    00150                         planes[scene::SViewFrustum::VF_TOP_PLANE],
    00151                         planes[scene::SViewFrustum::VF_LEFT_PLANE], p);
    00152
    00153                 return p;
    00154         }
    00155
    00156         inline core::vector3df SViewFrustum::getFarLeftDown() const
    00157         {
    00158                 core::vector3df p;
    00159                 planes[scene::SViewFrustum::VF_FAR_PLANE].getIntersectionWithPlanes(
    00160                         planes[scene::SViewFrustum::VF_BOTTOM_PLANE],
    00161                         planes[scene::SViewFrustum::VF_LEFT_PLANE], p);
    00162
    00163                 return p;
    00164         }
    00165
    00166         inline core::vector3df SViewFrustum::getFarRightUp() const
    00167         {
    00168                 core::vector3df p;
    00169                 planes[scene::SViewFrustum::VF_FAR_PLANE].getIntersectionWithPlanes(
    00170                         planes[scene::SViewFrustum::VF_TOP_PLANE],
    00171                         planes[scene::SViewFrustum::VF_RIGHT_PLANE], p);
    00172
    00173                 return p;
    00174         }
    00175
    00176         inline core::vector3df SViewFrustum::getFarRightDown() const
    00177         {
    00178                 core::vector3df p;
    00179                 planes[scene::SViewFrustum::VF_FAR_PLANE].getIntersectionWithPlanes(
    00180                         planes[scene::SViewFrustum::VF_BOTTOM_PLANE],
    00181                         planes[scene::SViewFrustum::VF_RIGHT_PLANE], p);
    00182
    00183                 return p;
    00184         }
    00185
    00186         inline const core::aabbox3d<f32> &SViewFrustum::getBoundingBox() const
    00187         {
    00188                 return boundingBox;
    00189         }
    00190
    00191         inline void SViewFrustum::recalculateBoundingBox()
    00192         {
    00193                 boundingBox.reset ( cameraPosition );
    00194
    00195                 boundingBox.addInternalPoint(getFarLeftUp());
    00196                 boundingBox.addInternalPoint(getFarRightUp());
    00197                 boundingBox.addInternalPoint(getFarLeftDown());
    00198                 boundingBox.addInternalPoint(getFarRightDown());
    00199         }
    00200
    00203         inline void SViewFrustum::setFrom(const core::matrix4& mat)
    00204         {
    00205                 // left clipping plane
    00206                 planes[VF_LEFT_PLANE].Normal.X = mat[3 ] + mat[0];
    00207                 planes[VF_LEFT_PLANE].Normal.Y = mat[7 ] + mat[4];
    00208                 planes[VF_LEFT_PLANE].Normal.Z = mat[11] + mat[8];
    00209                 planes[VF_LEFT_PLANE].D =        mat[15] + mat[12];
    00210
    00211                 // right clipping plane
    00212                 planes[VF_RIGHT_PLANE].Normal.X = mat[3 ] - mat[0];
    00213                 planes[VF_RIGHT_PLANE].Normal.Y = mat[7 ] - mat[4];
    00214                 planes[VF_RIGHT_PLANE].Normal.Z = mat[11] - mat[8];
    00215                 planes[VF_RIGHT_PLANE].D =        mat[15] - mat[12];
    00216
    00217                 // top clipping plane
    00218                 planes[VF_TOP_PLANE].Normal.X = mat[3 ] - mat[1];
    00219                 planes[VF_TOP_PLANE].Normal.Y = mat[7 ] - mat[5];
    00220                 planes[VF_TOP_PLANE].Normal.Z = mat[11] - mat[9];
    00221                 planes[VF_TOP_PLANE].D =        mat[15] - mat[13];
    00222
    00223                 // bottom clipping plane
    00224                 planes[VF_BOTTOM_PLANE].Normal.X = mat[3 ] + mat[1];
    00225                 planes[VF_BOTTOM_PLANE].Normal.Y = mat[7 ] + mat[5];
    00226                 planes[VF_BOTTOM_PLANE].Normal.Z = mat[11] + mat[9];
    00227                 planes[VF_BOTTOM_PLANE].D =        mat[15] + mat[13];
    00228
    00229                 // far clipping plane
    00230                 planes[VF_FAR_PLANE].Normal.X = mat[3 ] - mat[2];
    00231                 planes[VF_FAR_PLANE].Normal.Y = mat[7 ] - mat[6];
    00232                 planes[VF_FAR_PLANE].Normal.Z = mat[11] - mat[10];
    00233                 planes[VF_FAR_PLANE].D =        mat[15] - mat[14];
    00234
    00235                 // near clipping plane
    00236                 planes[VF_NEAR_PLANE].Normal.X = mat[2];
    00237                 planes[VF_NEAR_PLANE].Normal.Y = mat[6];
    00238                 planes[VF_NEAR_PLANE].Normal.Z = mat[10];
    00239                 planes[VF_NEAR_PLANE].D =        mat[14];
    00240
    00241                 // normalize normals
    00242                 u32 i;
    00243                 for ( i=0; i != VF_PLANE_COUNT; ++i)
    00244                 {
    00245                         const f32 len = -core::reciprocal_squareroot(
    00246                                         planes[i].Normal.getLengthSQ());
    00247                         planes[i].Normal *= len;
    00248                         planes[i].D *= len;
    00249                 }
    00250
    00251                 // make bounding box
    00252                 recalculateBoundingBox();
    00253         }
    00254
    00258         inline core::matrix4& SViewFrustum::getTransform(video::E_TRANSFORMATION_STATE state )
    00259         {
    00260                 u32 index = 0;
    00261                 switch ( state )
    00262                 {
    00263                         case video::ETS_PROJECTION:
    00264                                 index = SViewFrustum::ETS_PROJECTION; break;
    00265                         case video::ETS_VIEW:
    00266                                 index = SViewFrustum::ETS_VIEW; break;
    00267                         default:
    00268                                 break;
    00269                 }
    00270                 return Matrices [ index ];
    00271         }
    00272
    00276         inline const core::matrix4& SViewFrustum::getTransform(video::E_TRANSFORMATION_STATE state ) const
    00277         {
    00278                 u32 index = 0;
    00279                 switch ( state )
    00280                 {
    00281                         case video::ETS_PROJECTION:
    00282                                 index = SViewFrustum::ETS_PROJECTION; break;
    00283                         case video::ETS_VIEW:
    00284                                 index = SViewFrustum::ETS_VIEW; break;
    00285                         default:
    00286                                 break;
    00287                 }
    00288                 return Matrices [ index ];
    00289         }
    00290
    00292         inline bool SViewFrustum::clipLine(core::line3d<f32>& line) const
    00293         {
    00294                 bool wasClipped = false;
    00295                 for (u32 i=0; i < VF_PLANE_COUNT; ++i)
    00296                 {
    00297                         if (planes[i].classifyPointRelation(line.start) == core::ISREL3D_FRONT)
    00298                         {
    00299                                 line.start = line.start.getInterpolated(line.end,
    00300                                                 planes[i].getKnownIntersectionWithLine(line.start, line.end));
    00301                                 wasClipped = true;
    00302                         }
    00303                         if (planes[i].classifyPointRelation(line.end) == core::ISREL3D_FRONT)
    00304                         {
    00305                                 line.end = line.start.getInterpolated(line.end,
    00306                                                 planes[i].getKnownIntersectionWithLine(line.start, line.end));
    00307                                 wasClipped = true;
    00308                         }
    00309                 }
    00310                 return wasClipped;
    00311         }
    00312
    00313
    00314 } // end namespace scene
    00315 } // end namespace irr
    00316
    00317 #endif
    00318

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