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# plane3d.h

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    00001 // Copyright (C) 2002-2010 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 __IRR_PLANE_3D_H_INCLUDED__
    00006 #define __IRR_PLANE_3D_H_INCLUDED__
    00007
    00008 #include "irrMath.h"
    00009 #include "vector3d.h"
    00010
    00011 namespace irr
    00012 {
    00013 namespace core
    00014 {
    00015
    00017 enum EIntersectionRelation3D
    00018 {
    00019         ISREL3D_FRONT = 0,
    00020         ISREL3D_BACK,
    00021         ISREL3D_PLANAR,
    00022         ISREL3D_SPANNING,
    00023         ISREL3D_CLIPPED
    00024 };
    00025
    00027 template <class T>
    00028 class plane3d
    00029 {
    00030         public:
    00031
    00032                 // Constructors
    00033
    00034                 plane3d(): Normal(0,1,0) { recalculateD(vector3d<T>(0,0,0)); }
    00035
    00036                 plane3d(const vector3d<T>& MPoint, const vector3d<T>& Normal) : Normal(Normal) { recalculateD(MPoint); }
    00037
    00038                 plane3d(T px, T py, T pz, T nx, T ny, T nz) : Normal(nx, ny, nz) { recalculateD(vector3d<T>(px, py, pz)); }
    00039
    00040                 plane3d(const vector3d<T>& point1, const vector3d<T>& point2, const vector3d<T>& point3)
    00041                 { setPlane(point1, point2, point3); }
    00042
    00043                 plane3d(const vector3d<T> & normal, const T d) : Normal(normal), D(d) { }
    00044
    00045                 // operators
    00046
    00047                 inline bool operator==(const plane3d<T>& other) const { return (equals(D, other.D) && Normal==other.Normal);}
    00048
    00049                 inline bool operator!=(const plane3d<T>& other) const { return !(*this == other);}
    00050
    00051                 // functions
    00052
    00053                 void setPlane(const vector3d<T>& point, const vector3d<T>& nvector)
    00054                 {
    00055                         Normal = nvector;
    00056                         recalculateD(point);
    00057                 }
    00058
    00059                 void setPlane(const vector3d<T>& nvect, T d)
    00060                 {
    00061                         Normal = nvect;
    00062                         D = d;
    00063                 }
    00064
    00065                 void setPlane(const vector3d<T>& point1, const vector3d<T>& point2, const vector3d<T>& point3)
    00066                 {
    00067                         // creates the plane from 3 memberpoints
    00068                         Normal = (point2 - point1).crossProduct(point3 - point1);
    00069                         Normal.normalize();
    00070
    00071                         recalculateD(point1);
    00072                 }
    00073
    00074
    00076
    00081                 bool getIntersectionWithLine(const vector3d<T>& linePoint,
    00082                                 const vector3d<T>& lineVect,
    00083                                 vector3d<T>& outIntersection) const
    00084                 {
    00085                         T t2 = Normal.dotProduct(lineVect);
    00086
    00087                         if (t2 == 0)
    00088                                 return false;
    00089
    00090                         T t =- (Normal.dotProduct(linePoint) + D) / t2;
    00091                         outIntersection = linePoint + (lineVect * t);
    00092                         return true;
    00093                 }
    00094
    00096
    00102                 f32 getKnownIntersectionWithLine(const vector3d<T>& linePoint1,
    00103                         const vector3d<T>& linePoint2) const
    00104                 {
    00105                         vector3d<T> vect = linePoint2 - linePoint1;
    00106                         T t2 = (f32)Normal.dotProduct(vect);
    00107                         return (f32)-((Normal.dotProduct(linePoint1) + D) / t2);
    00108                 }
    00109
    00111
    00116                 bool getIntersectionWithLimitedLine(
    00117                                 const vector3d<T>& linePoint1,
    00118                                 const vector3d<T>& linePoint2,
    00119                                 vector3d<T>& outIntersection) const
    00120                 {
    00121                         return (getIntersectionWithLine(linePoint1, linePoint2 - linePoint1, outIntersection) &&
    00122                                         outIntersection.isBetweenPoints(linePoint1, linePoint2));
    00123                 }
    00124
    00126
    00130                 EIntersectionRelation3D classifyPointRelation(const vector3d<T>& point) const
    00131                 {
    00132                         const T d = Normal.dotProduct(point) + D;
    00133
    00134                         if (d < -ROUNDING_ERROR_f32)
    00135                                 return ISREL3D_BACK;
    00136
    00137                         if (d > ROUNDING_ERROR_f32)
    00138                                 return ISREL3D_FRONT;
    00139
    00140                         return ISREL3D_PLANAR;
    00141                 }
    00142
    00144                 void recalculateD(const vector3d<T>& MPoint)
    00145                 {
    00146                         D = - MPoint.dotProduct(Normal);
    00147                 }
    00148
    00150                 vector3d<T> getMemberPoint() const
    00151                 {
    00152                         return Normal * -D;
    00153                 }
    00154
    00156
    00157                 bool existsIntersection(const plane3d<T>& other) const
    00158                 {
    00159                         vector3d<T> cross = other.Normal.crossProduct(Normal);
    00160                         return cross.getLength() > core::ROUNDING_ERROR_f32;
    00161                 }
    00162
    00164
    00168                 bool getIntersectionWithPlane(const plane3d<T>& other,
    00169                                 vector3d<T>& outLinePoint,
    00170                                 vector3d<T>& outLineVect) const
    00171                 {
    00172                         const T fn00 = Normal.getLength();
    00173                         const T fn01 = Normal.dotProduct(other.Normal);
    00174                         const T fn11 = other.Normal.getLength();
    00175                         const f64 det = fn00*fn11 - fn01*fn01;
    00176
    00177                         if (fabs(det) < ROUNDING_ERROR_f64 )
    00178                                 return false;
    00179
    00180                         const f64 invdet = 1.0 / det;
    00181                         const f64 fc0 = (fn11*-D + fn01*other.D) * invdet;
    00182                         const f64 fc1 = (fn00*-other.D + fn01*D) * invdet;
    00183
    00184                         outLineVect = Normal.crossProduct(other.Normal);
    00185                         outLinePoint = Normal*(T)fc0 + other.Normal*(T)fc1;
    00186                         return true;
    00187                 }
    00188
    00190                 bool getIntersectionWithPlanes(const plane3d<T>& o1,
    00191                                 const plane3d<T>& o2, vector3d<T>& outPoint) const
    00192                 {
    00193                         vector3d<T> linePoint, lineVect;
    00194                         if (getIntersectionWithPlane(o1, linePoint, lineVect))
    00195                                 return o2.getIntersectionWithLine(linePoint, lineVect, outPoint);
    00196
    00197                         return false;
    00198                 }
    00199
    00201
    00209                 bool isFrontFacing(const vector3d<T>& lookDirection) const
    00210                 {
    00211                         const f32 d = Normal.dotProduct(lookDirection);
    00212                         return F32_LOWER_EQUAL_0 ( d );
    00213                 }
    00214
    00216
    00217                 T getDistanceTo(const vector3d<T>& point) const
    00218                 {
    00219                         return point.dotProduct(Normal) + D;
    00220                 }
    00221
    00223                 vector3d<T> Normal;
    00224
    00226                 T D;
    00227 };
    00228
    00229
    00231 typedef plane3d<f32> plane3df;
    00232
    00234 typedef plane3d<s32> plane3di;
    00235
    00236 } // end namespace core
    00237 } // end namespace irr
    00238
    00239 #endif
    00240

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