| 1 | /* | 
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| 2 | ----------------------------------------------------------------------------- | 
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| 3 | This source file is part of OGRE | 
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| 4 | (Object-oriented Graphics Rendering Engine) | 
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| 5 | For the latest info, see http://www.ogre3d.org/ | 
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| 6 |  | 
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| 7 | Copyright (c) 2000-2006 Torus Knot Software Ltd | 
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| 8 | Also see acknowledgements in Readme.html | 
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| 9 |  | 
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| 10 | This program is free software; you can redistribute it and/or modify it under | 
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| 11 | the terms of the GNU Lesser General Public License as published by the Free Software | 
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| 12 | Foundation; either version 2 of the License, or (at your option) any later | 
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| 13 | version. | 
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| 14 |  | 
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| 15 | This program is distributed in the hope that it will be useful, but WITHOUT | 
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| 16 | ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS | 
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| 17 | FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. | 
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| 18 |  | 
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| 19 | You should have received a copy of the GNU Lesser General Public License along with | 
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| 20 | this program; if not, write to the Free Software Foundation, Inc., 59 Temple | 
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| 21 | Place - Suite 330, Boston, MA 02111-1307, USA, or go to | 
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| 22 | http://www.gnu.org/copyleft/lesser.txt. | 
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| 23 |  | 
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| 24 | You may alternatively use this source under the terms of a specific version of | 
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| 25 | the OGRE Unrestricted License provided you have obtained such a license from | 
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| 26 | Torus Knot Software Ltd. | 
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| 27 | ----------------------------------------------------------------------------- | 
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| 28 | */ | 
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| 29 | #ifndef __Math_H__ | 
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| 30 | #define __Math_H__ | 
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| 31 |  | 
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| 32 | #include "OgrePrerequisites.h" | 
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| 33 |  | 
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| 34 | namespace Ogre | 
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| 35 | { | 
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| 36 | /** Wrapper class which indicates a given angle value is in Radians. | 
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| 37 | @remarks | 
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| 38 | Radian values are interchangeable with Degree values, and conversions | 
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| 39 | will be done automatically between them. | 
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| 40 | */ | 
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| 41 | class Radian | 
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| 42 | { | 
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| 43 | Real mRad; | 
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| 44 |  | 
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| 45 | public: | 
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| 46 | explicit Radian ( Real r=0 ) : mRad(r) {} | 
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| 47 | Radian ( const Degree& d ); | 
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| 48 | Radian& operator = ( const Real& f ) { mRad = f; return *this; } | 
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| 49 | Radian& operator = ( const Radian& r ) { mRad = r.mRad; return *this; } | 
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| 50 | Radian& operator = ( const Degree& d ); | 
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| 51 |  | 
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| 52 | Real valueDegrees() const; // see bottom of this file | 
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| 53 | Real valueRadians() const { return mRad; } | 
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| 54 | Real valueAngleUnits() const; | 
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| 55 |  | 
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| 56 | const Radian& operator + () const { return *this; } | 
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| 57 | Radian operator + ( const Radian& r ) const { return Radian ( mRad + r.mRad ); } | 
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| 58 | Radian operator + ( const Degree& d ) const; | 
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| 59 | Radian& operator += ( const Radian& r ) { mRad += r.mRad; return *this; } | 
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| 60 | Radian& operator += ( const Degree& d ); | 
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| 61 | Radian operator - () const { return Radian(-mRad); } | 
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| 62 | Radian operator - ( const Radian& r ) const { return Radian ( mRad - r.mRad ); } | 
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| 63 | Radian operator - ( const Degree& d ) const; | 
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| 64 | Radian& operator -= ( const Radian& r ) { mRad -= r.mRad; return *this; } | 
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| 65 | Radian& operator -= ( const Degree& d ); | 
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| 66 | Radian operator * ( Real f ) const { return Radian ( mRad * f ); } | 
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| 67 | Radian operator * ( const Radian& f ) const { return Radian ( mRad * f.mRad ); } | 
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| 68 | Radian& operator *= ( Real f ) { mRad *= f; return *this; } | 
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| 69 | Radian operator / ( Real f ) const { return Radian ( mRad / f ); } | 
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| 70 | Radian& operator /= ( Real f ) { mRad /= f; return *this; } | 
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| 71 |  | 
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| 72 | bool operator <  ( const Radian& r ) const { return mRad <  r.mRad; } | 
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| 73 | bool operator <= ( const Radian& r ) const { return mRad <= r.mRad; } | 
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| 74 | bool operator == ( const Radian& r ) const { return mRad == r.mRad; } | 
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| 75 | bool operator != ( const Radian& r ) const { return mRad != r.mRad; } | 
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| 76 | bool operator >= ( const Radian& r ) const { return mRad >= r.mRad; } | 
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| 77 | bool operator >  ( const Radian& r ) const { return mRad >  r.mRad; } | 
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| 78 | }; | 
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| 79 |  | 
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| 80 | /** Wrapper class which indicates a given angle value is in Degrees. | 
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| 81 | @remarks | 
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| 82 | Degree values are interchangeable with Radian values, and conversions | 
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| 83 | will be done automatically between them. | 
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| 84 | */ | 
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| 85 | class Degree | 
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| 86 | { | 
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| 87 | Real mDeg; // if you get an error here - make sure to define/typedef 'Real' first | 
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| 88 |  | 
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| 89 | public: | 
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| 90 | explicit Degree ( Real d=0 ) : mDeg(d) {} | 
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| 91 | Degree ( const Radian& r ) : mDeg(r.valueDegrees()) {} | 
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| 92 | Degree& operator = ( const Real& f ) { mDeg = f; return *this; } | 
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| 93 | Degree& operator = ( const Degree& d ) { mDeg = d.mDeg; return *this; } | 
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| 94 | Degree& operator = ( const Radian& r ) { mDeg = r.valueDegrees(); return *this; } | 
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| 95 |  | 
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| 96 | Real valueDegrees() const { return mDeg; } | 
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| 97 | Real valueRadians() const; // see bottom of this file | 
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| 98 | Real valueAngleUnits() const; | 
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| 99 |  | 
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| 100 | const Degree& operator + () const { return *this; } | 
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| 101 | Degree operator + ( const Degree& d ) const { return Degree ( mDeg + d.mDeg ); } | 
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| 102 | Degree operator + ( const Radian& r ) const { return Degree ( mDeg + r.valueDegrees() ); } | 
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| 103 | Degree& operator += ( const Degree& d ) { mDeg += d.mDeg; return *this; } | 
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| 104 | Degree& operator += ( const Radian& r ) { mDeg += r.valueDegrees(); return *this; } | 
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| 105 | Degree operator - () const { return Degree(-mDeg); } | 
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| 106 | Degree operator - ( const Degree& d ) const { return Degree ( mDeg - d.mDeg ); } | 
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| 107 | Degree operator - ( const Radian& r ) const { return Degree ( mDeg - r.valueDegrees() ); } | 
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| 108 | Degree& operator -= ( const Degree& d ) { mDeg -= d.mDeg; return *this; } | 
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| 109 | Degree& operator -= ( const Radian& r ) { mDeg -= r.valueDegrees(); return *this; } | 
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| 110 | Degree operator * ( Real f ) const { return Degree ( mDeg * f ); } | 
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| 111 | Degree operator * ( const Degree& f ) const { return Degree ( mDeg * f.mDeg ); } | 
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| 112 | Degree& operator *= ( Real f ) { mDeg *= f; return *this; } | 
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| 113 | Degree operator / ( Real f ) const { return Degree ( mDeg / f ); } | 
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| 114 | Degree& operator /= ( Real f ) { mDeg /= f; return *this; } | 
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| 115 |  | 
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| 116 | bool operator <  ( const Degree& d ) const { return mDeg <  d.mDeg; } | 
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| 117 | bool operator <= ( const Degree& d ) const { return mDeg <= d.mDeg; } | 
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| 118 | bool operator == ( const Degree& d ) const { return mDeg == d.mDeg; } | 
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| 119 | bool operator != ( const Degree& d ) const { return mDeg != d.mDeg; } | 
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| 120 | bool operator >= ( const Degree& d ) const { return mDeg >= d.mDeg; } | 
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| 121 | bool operator >  ( const Degree& d ) const { return mDeg >  d.mDeg; } | 
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| 122 | }; | 
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| 123 |  | 
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| 124 | /** Wrapper class which identifies a value as the currently default angle | 
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| 125 | type, as defined by Math::setAngleUnit. | 
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| 126 | @remarks | 
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| 127 | Angle values will be automatically converted between radians and degrees, | 
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| 128 | as appropriate. | 
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| 129 | */ | 
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| 130 | class Angle | 
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| 131 | { | 
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| 132 | Real mAngle; | 
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| 133 | public: | 
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| 134 | explicit Angle ( Real angle ) : mAngle(angle) {} | 
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| 135 | operator Radian() const; | 
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| 136 | operator Degree() const; | 
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| 137 | }; | 
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| 138 |  | 
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| 139 | // these functions could not be defined within the class definition of class | 
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| 140 | // Radian because they required class Degree to be defined | 
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| 141 | inline Radian::Radian ( const Degree& d ) : mRad(d.valueRadians()) { | 
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| 142 | } | 
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| 143 | inline Radian& Radian::operator = ( const Degree& d ) { | 
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| 144 | mRad = d.valueRadians(); return *this; | 
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| 145 | } | 
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| 146 | inline Radian Radian::operator + ( const Degree& d ) const { | 
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| 147 | return Radian ( mRad + d.valueRadians() ); | 
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| 148 | } | 
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| 149 | inline Radian& Radian::operator += ( const Degree& d ) { | 
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| 150 | mRad += d.valueRadians(); | 
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| 151 | return *this; | 
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| 152 | } | 
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| 153 | inline Radian Radian::operator - ( const Degree& d ) const { | 
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| 154 | return Radian ( mRad - d.valueRadians() ); | 
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| 155 | } | 
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| 156 | inline Radian& Radian::operator -= ( const Degree& d ) { | 
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| 157 | mRad -= d.valueRadians(); | 
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| 158 | return *this; | 
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| 159 | } | 
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| 160 |  | 
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| 161 | /** Class to provide access to common mathematical functions. | 
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| 162 | @remarks | 
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| 163 | Most of the maths functions are aliased versions of the C runtime | 
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| 164 | library functions. They are aliased here to provide future | 
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| 165 | optimisation opportunities, either from faster RTLs or custom | 
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| 166 | math approximations. | 
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| 167 | @note | 
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| 168 | <br>This is based on MgcMath.h from | 
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| 169 | <a href="http://www.geometrictools.com/">Wild Magic</a>. | 
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| 170 | */ | 
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| 171 | class _OgreExport Math | 
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| 172 | { | 
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| 173 | public: | 
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| 174 | /** The angular units used by the API. This functionality is now deprecated in favor | 
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| 175 | of discreet angular unit types ( see Degree and Radian above ). The only place | 
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| 176 | this functionality is actually still used is when parsing files. Search for | 
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| 177 | usage of the Angle class for those instances | 
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| 178 | */ | 
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| 179 | enum AngleUnit | 
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| 180 | { | 
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| 181 | AU_DEGREE, | 
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| 182 | AU_RADIAN | 
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| 183 | }; | 
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| 184 |  | 
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| 185 | protected: | 
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| 186 | // angle units used by the api | 
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| 187 | static AngleUnit msAngleUnit; | 
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| 188 |  | 
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| 189 | /// Size of the trig tables as determined by constructor. | 
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| 190 | static int mTrigTableSize; | 
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| 191 |  | 
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| 192 | /// Radian -> index factor value ( mTrigTableSize / 2 * PI ) | 
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| 193 | static Real mTrigTableFactor; | 
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| 194 | static Real* mSinTable; | 
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| 195 | static Real* mTanTable; | 
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| 196 |  | 
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| 197 | /** Private function to build trig tables. | 
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| 198 | */ | 
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| 199 | void buildTrigTables(); | 
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| 200 |  | 
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| 201 | static Real SinTable (Real fValue); | 
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| 202 | static Real TanTable (Real fValue); | 
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| 203 | public: | 
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| 204 | /** Default constructor. | 
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| 205 | @param | 
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| 206 | trigTableSize Optional parameter to set the size of the | 
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| 207 | tables used to implement Sin, Cos, Tan | 
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| 208 | */ | 
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| 209 | Math(unsigned int trigTableSize = 4096); | 
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| 210 |  | 
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| 211 | /** Default destructor. | 
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| 212 | */ | 
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| 213 | ~Math(); | 
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| 214 |  | 
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| 215 | static inline int IAbs (int iValue) { return ( iValue >= 0 ? iValue : -iValue ); } | 
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| 216 | static inline int ICeil (float fValue) { return int(ceil(fValue)); } | 
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| 217 | static inline int IFloor (float fValue) { return int(floor(fValue)); } | 
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| 218 | static int ISign (int iValue); | 
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| 219 |  | 
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| 220 | static inline Real Abs (Real fValue) { return Real(fabs(fValue)); } | 
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| 221 | static inline Degree Abs (const Degree& dValue) { return Degree(fabs(dValue.valueDegrees())); } | 
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| 222 | static inline Radian Abs (const Radian& rValue) { return Radian(fabs(rValue.valueRadians())); } | 
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| 223 | static Radian ACos (Real fValue); | 
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| 224 | static Radian ASin (Real fValue); | 
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| 225 | static inline Radian ATan (Real fValue) { return Radian(atan(fValue)); } | 
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| 226 | static inline Radian ATan2 (Real fY, Real fX) { return Radian(atan2(fY,fX)); } | 
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| 227 | static inline Real Ceil (Real fValue) { return Real(ceil(fValue)); } | 
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| 228 |  | 
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| 229 | /** Cosine function. | 
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| 230 | @param | 
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| 231 | fValue Angle in radians | 
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| 232 | @param | 
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| 233 | useTables If true, uses lookup tables rather than | 
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| 234 | calculation - faster but less accurate. | 
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| 235 | */ | 
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| 236 | static inline Real Cos (const Radian& fValue, bool useTables = false) { | 
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| 237 | return (!useTables) ? Real(cos(fValue.valueRadians())) : SinTable(fValue.valueRadians() + HALF_PI); | 
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| 238 | } | 
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| 239 | /** Cosine function. | 
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| 240 | @param | 
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| 241 | fValue Angle in radians | 
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| 242 | @param | 
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| 243 | useTables If true, uses lookup tables rather than | 
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| 244 | calculation - faster but less accurate. | 
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| 245 | */ | 
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| 246 | static inline Real Cos (Real fValue, bool useTables = false) { | 
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| 247 | return (!useTables) ? Real(cos(fValue)) : SinTable(fValue + HALF_PI); | 
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| 248 | } | 
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| 249 |  | 
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| 250 | static inline Real Exp (Real fValue) { return Real(exp(fValue)); } | 
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| 251 |  | 
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| 252 | static inline Real Floor (Real fValue) { return Real(floor(fValue)); } | 
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| 253 |  | 
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| 254 | static inline Real Log (Real fValue) { return Real(log(fValue)); } | 
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| 255 |  | 
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| 256 | static inline Real Pow (Real fBase, Real fExponent) { return Real(pow(fBase,fExponent)); } | 
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| 257 |  | 
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| 258 | static Real Sign (Real fValue); | 
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| 259 | static inline Radian Sign ( const Radian& rValue ) | 
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| 260 | { | 
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| 261 | return Radian(Sign(rValue.valueRadians())); | 
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| 262 | } | 
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| 263 | static inline Degree Sign ( const Degree& dValue ) | 
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| 264 | { | 
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| 265 | return Degree(Sign(dValue.valueDegrees())); | 
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| 266 | } | 
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| 267 |  | 
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| 268 | /** Sine function. | 
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| 269 | @param | 
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| 270 | fValue Angle in radians | 
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| 271 | @param | 
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| 272 | useTables If true, uses lookup tables rather than | 
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| 273 | calculation - faster but less accurate. | 
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| 274 | */ | 
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| 275 | static inline Real Sin (const Radian& fValue, bool useTables = false) { | 
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| 276 | return (!useTables) ? Real(sin(fValue.valueRadians())) : SinTable(fValue.valueRadians()); | 
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| 277 | } | 
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| 278 | /** Sine function. | 
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| 279 | @param | 
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| 280 | fValue Angle in radians | 
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| 281 | @param | 
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| 282 | useTables If true, uses lookup tables rather than | 
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| 283 | calculation - faster but less accurate. | 
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| 284 | */ | 
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| 285 | static inline Real Sin (Real fValue, bool useTables = false) { | 
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| 286 | return (!useTables) ? Real(sin(fValue)) : SinTable(fValue); | 
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| 287 | } | 
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| 288 |  | 
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| 289 | static inline Real Sqr (Real fValue) { return fValue*fValue; } | 
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| 290 |  | 
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| 291 | static inline Real Sqrt (Real fValue) { return Real(sqrt(fValue)); } | 
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| 292 |  | 
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| 293 | static inline Radian Sqrt (const Radian& fValue) { return Radian(sqrt(fValue.valueRadians())); } | 
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| 294 |  | 
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| 295 | static inline Degree Sqrt (const Degree& fValue) { return Degree(sqrt(fValue.valueDegrees())); } | 
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| 296 |  | 
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| 297 | /** Inverse square root i.e. 1 / Sqrt(x), good for vector | 
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| 298 | normalisation. | 
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| 299 | */ | 
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| 300 | static Real InvSqrt(Real fValue); | 
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| 301 |  | 
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| 302 | static Real UnitRandom ();  // in [0,1] | 
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| 303 |  | 
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| 304 | static Real RangeRandom (Real fLow, Real fHigh);  // in [fLow,fHigh] | 
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| 305 |  | 
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| 306 | static Real SymmetricRandom ();  // in [-1,1] | 
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| 307 |  | 
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| 308 | /** Tangent function. | 
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| 309 | @param | 
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| 310 | fValue Angle in radians | 
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| 311 | @param | 
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| 312 | useTables If true, uses lookup tables rather than | 
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| 313 | calculation - faster but less accurate. | 
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| 314 | */ | 
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| 315 | static inline Real Tan (const Radian& fValue, bool useTables = false) { | 
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| 316 | return (!useTables) ? Real(tan(fValue.valueRadians())) : TanTable(fValue.valueRadians()); | 
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| 317 | } | 
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| 318 | /** Tangent function. | 
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| 319 | @param | 
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| 320 | fValue Angle in radians | 
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| 321 | @param | 
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| 322 | useTables If true, uses lookup tables rather than | 
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| 323 | calculation - faster but less accurate. | 
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| 324 | */ | 
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| 325 | static inline Real Tan (Real fValue, bool useTables = false) { | 
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| 326 | return (!useTables) ? Real(tan(fValue)) : TanTable(fValue); | 
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| 327 | } | 
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| 328 |  | 
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| 329 | static inline Real DegreesToRadians(Real degrees) { return degrees * fDeg2Rad; } | 
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| 330 | static inline Real RadiansToDegrees(Real radians) { return radians * fRad2Deg; } | 
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| 331 |  | 
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| 332 | /** These functions used to set the assumed angle units (radians or degrees) | 
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| 333 | expected when using the Angle type. | 
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| 334 | @par | 
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| 335 | You can set this directly after creating a new Root, and also before/after resource creation, | 
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| 336 | depending on whether you want the change to affect resource files. | 
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| 337 | */ | 
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| 338 | static void setAngleUnit(AngleUnit unit); | 
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| 339 | /** Get the unit being used for angles. */ | 
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| 340 | static AngleUnit getAngleUnit(void); | 
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| 341 |  | 
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| 342 | /** Convert from the current AngleUnit to radians. */ | 
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| 343 | static Real AngleUnitsToRadians(Real units); | 
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| 344 | /** Convert from radians to the current AngleUnit . */ | 
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| 345 | static Real RadiansToAngleUnits(Real radians); | 
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| 346 | /** Convert from the current AngleUnit to degrees. */ | 
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| 347 | static Real AngleUnitsToDegrees(Real units); | 
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| 348 | /** Convert from degrees to the current AngleUnit. */ | 
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| 349 | static Real DegreesToAngleUnits(Real degrees); | 
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| 350 |  | 
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| 351 | /** Checks whether a given point is inside a triangle, in a | 
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| 352 | 2-dimensional (Cartesian) space. | 
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| 353 | @remarks | 
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| 354 | The vertices of the triangle must be given in either | 
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| 355 | trigonometrical (anticlockwise) or inverse trigonometrical | 
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| 356 | (clockwise) order. | 
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| 357 | @param | 
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| 358 | p The point. | 
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| 359 | @param | 
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| 360 | a The triangle's first vertex. | 
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| 361 | @param | 
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| 362 | b The triangle's second vertex. | 
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| 363 | @param | 
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| 364 | c The triangle's third vertex. | 
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| 365 | @returns | 
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| 366 | If the point resides in the triangle, <b>true</b> is | 
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| 367 | returned. | 
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| 368 | @par | 
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| 369 | If the point is outside the triangle, <b>false</b> is | 
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| 370 | returned. | 
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| 371 | */ | 
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| 372 | static bool pointInTri2D(const Vector2& p, const Vector2& a, | 
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| 373 | const Vector2& b, const Vector2& c); | 
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| 374 |  | 
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| 375 | /** Checks whether a given 3D point is inside a triangle. | 
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| 376 | @remarks | 
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| 377 | The vertices of the triangle must be given in either | 
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| 378 | trigonometrical (anticlockwise) or inverse trigonometrical | 
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| 379 | (clockwise) order, and the point must be guaranteed to be in the | 
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| 380 | same plane as the triangle | 
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| 381 | @param | 
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| 382 | p The point. | 
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| 383 | @param | 
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| 384 | a The triangle's first vertex. | 
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| 385 | @param | 
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| 386 | b The triangle's second vertex. | 
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| 387 | @param | 
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| 388 | c The triangle's third vertex. | 
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| 389 | @param | 
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| 390 | normal The triangle plane's normal (passed in rather than calculated | 
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| 391 | on demand since the callermay already have it) | 
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| 392 | @returns | 
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| 393 | If the point resides in the triangle, <b>true</b> is | 
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| 394 | returned. | 
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| 395 | @par | 
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| 396 | If the point is outside the triangle, <b>false</b> is | 
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| 397 | returned. | 
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| 398 | */ | 
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| 399 | static bool pointInTri3D(const Vector3& p, const Vector3& a, | 
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| 400 | const Vector3& b, const Vector3& c, const Vector3& normal); | 
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| 401 | /** Ray / plane intersection, returns boolean result and distance. */ | 
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| 402 | static std::pair<bool, Real> intersects(const Ray& ray, const Plane& plane); | 
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| 403 |  | 
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| 404 | /** Ray / sphere intersection, returns boolean result and distance. */ | 
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| 405 | static std::pair<bool, Real> intersects(const Ray& ray, const Sphere& sphere, | 
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| 406 | bool discardInside = true); | 
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| 407 |  | 
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| 408 | /** Ray / box intersection, returns boolean result and distance. */ | 
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| 409 | static std::pair<bool, Real> intersects(const Ray& ray, const AxisAlignedBox& box); | 
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| 410 |  | 
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| 411 | /** Ray / box intersection, returns boolean result and two intersection distance. | 
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| 412 | @param | 
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| 413 | ray The ray. | 
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| 414 | @param | 
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| 415 | box The box. | 
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| 416 | @param | 
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| 417 | d1 A real pointer to retrieve the near intersection distance | 
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| 418 | from the ray origin, maybe <b>null</b> which means don't care | 
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| 419 | about the near intersection distance. | 
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| 420 | @param | 
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| 421 | d2 A real pointer to retrieve the far intersection distance | 
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| 422 | from the ray origin, maybe <b>null</b> which means don't care | 
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| 423 | about the far intersection distance. | 
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| 424 | @returns | 
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| 425 | If the ray is intersects the box, <b>true</b> is returned, and | 
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| 426 | the near intersection distance is return by <i>d1</i>, the | 
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| 427 | far intersection distance is return by <i>d2</i>. Guarantee | 
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| 428 | <b>0</b> <= <i>d1</i> <= <i>d2</i>. | 
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| 429 | @par | 
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| 430 | If the ray isn't intersects the box, <b>false</b> is returned, and | 
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| 431 | <i>d1</i> and <i>d2</i> is unmodified. | 
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| 432 | */ | 
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| 433 | static bool intersects(const Ray& ray, const AxisAlignedBox& box, | 
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| 434 | Real* d1, Real* d2); | 
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| 435 |  | 
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| 436 | /** Ray / triangle intersection, returns boolean result and distance. | 
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| 437 | @param | 
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| 438 | ray The ray. | 
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| 439 | @param | 
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| 440 | a The triangle's first vertex. | 
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| 441 | @param | 
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| 442 | b The triangle's second vertex. | 
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| 443 | @param | 
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| 444 | c The triangle's third vertex. | 
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| 445 | @param | 
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| 446 | normal The triangle plane's normal (passed in rather than calculated | 
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| 447 | on demand since the callermay already have it), doesn't need | 
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| 448 | normalised since we don't care. | 
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| 449 | @param | 
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| 450 | positiveSide Intersect with "positive side" of the triangle | 
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| 451 | @param | 
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| 452 | negativeSide Intersect with "negative side" of the triangle | 
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| 453 | @returns | 
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| 454 | If the ray is intersects the triangle, a pair of <b>true</b> and the | 
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| 455 | distance between intersection point and ray origin returned. | 
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| 456 | @par | 
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| 457 | If the ray isn't intersects the triangle, a pair of <b>false</b> and | 
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| 458 | <b>0</b> returned. | 
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| 459 | */ | 
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| 460 | static std::pair<bool, Real> intersects(const Ray& ray, const Vector3& a, | 
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| 461 | const Vector3& b, const Vector3& c, const Vector3& normal, | 
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| 462 | bool positiveSide = true, bool negativeSide = true); | 
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| 463 |  | 
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| 464 | /** Ray / triangle intersection, returns boolean result and distance. | 
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| 465 | @param | 
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| 466 | ray The ray. | 
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| 467 | @param | 
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| 468 | a The triangle's first vertex. | 
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| 469 | @param | 
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| 470 | b The triangle's second vertex. | 
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| 471 | @param | 
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| 472 | c The triangle's third vertex. | 
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| 473 | @param | 
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| 474 | positiveSide Intersect with "positive side" of the triangle | 
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| 475 | @param | 
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| 476 | negativeSide Intersect with "negative side" of the triangle | 
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| 477 | @returns | 
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| 478 | If the ray is intersects the triangle, a pair of <b>true</b> and the | 
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| 479 | distance between intersection point and ray origin returned. | 
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| 480 | @par | 
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| 481 | If the ray isn't intersects the triangle, a pair of <b>false</b> and | 
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| 482 | <b>0</b> returned. | 
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| 483 | */ | 
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| 484 | static std::pair<bool, Real> intersects(const Ray& ray, const Vector3& a, | 
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| 485 | const Vector3& b, const Vector3& c, | 
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| 486 | bool positiveSide = true, bool negativeSide = true); | 
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| 487 |  | 
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| 488 | /** Sphere / box intersection test. */ | 
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| 489 | static bool intersects(const Sphere& sphere, const AxisAlignedBox& box); | 
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| 490 |  | 
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| 491 | /** Plane / box intersection test. */ | 
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| 492 | static bool intersects(const Plane& plane, const AxisAlignedBox& box); | 
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| 493 |  | 
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| 494 | /** Ray / convex plane list intersection test. | 
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| 495 | @param ray The ray to test with | 
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| 496 | @param plaeList List of planes which form a convex volume | 
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| 497 | @param normalIsOutside Does the normal point outside the volume | 
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| 498 | */ | 
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| 499 | static std::pair<bool, Real> intersects( | 
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| 500 | const Ray& ray, const std::vector<Plane>& planeList, | 
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| 501 | bool normalIsOutside); | 
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| 502 | /** Ray / convex plane list intersection test. | 
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| 503 | @param ray The ray to test with | 
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| 504 | @param plaeList List of planes which form a convex volume | 
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| 505 | @param normalIsOutside Does the normal point outside the volume | 
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| 506 | */ | 
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| 507 | static std::pair<bool, Real> intersects( | 
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| 508 | const Ray& ray, const std::list<Plane>& planeList, | 
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| 509 | bool normalIsOutside); | 
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| 510 |  | 
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| 511 | /** Sphere / plane intersection test. | 
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| 512 | @remarks NB just do a plane.getDistance(sphere.getCenter()) for more detail! | 
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| 513 | */ | 
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| 514 | static bool intersects(const Sphere& sphere, const Plane& plane); | 
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| 515 |  | 
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| 516 | /** Compare 2 reals, using tolerance for inaccuracies. | 
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| 517 | */ | 
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| 518 | static bool RealEqual(Real a, Real b, | 
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| 519 | Real tolerance = std::numeric_limits<Real>::epsilon()); | 
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| 520 |  | 
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| 521 | /** Calculates the tangent space vector for a given set of positions / texture coords. */ | 
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| 522 | static Vector3 calculateTangentSpaceVector( | 
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| 523 | const Vector3& position1, const Vector3& position2, const Vector3& position3, | 
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| 524 | Real u1, Real v1, Real u2, Real v2, Real u3, Real v3); | 
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| 525 |  | 
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| 526 | /** Build a reflection matrix for the passed in plane. */ | 
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| 527 | static Matrix4 buildReflectionMatrix(const Plane& p); | 
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| 528 | /** Calculate a face normal, including the w component which is the offset from the origin. */ | 
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| 529 | static Vector4 calculateFaceNormal(const Vector3& v1, const Vector3& v2, const Vector3& v3); | 
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| 530 | /** Calculate a face normal, no w-information. */ | 
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| 531 | static Vector3 calculateBasicFaceNormal(const Vector3& v1, const Vector3& v2, const Vector3& v3); | 
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| 532 | /** Calculate a face normal without normalize, including the w component which is the offset from the origin. */ | 
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| 533 | static Vector4 calculateFaceNormalWithoutNormalize(const Vector3& v1, const Vector3& v2, const Vector3& v3); | 
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| 534 | /** Calculate a face normal without normalize, no w-information. */ | 
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| 535 | static Vector3 calculateBasicFaceNormalWithoutNormalize(const Vector3& v1, const Vector3& v2, const Vector3& v3); | 
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| 536 |  | 
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| 537 | /** Generates a value based on the gaussian (normal) distribution function | 
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| 538 | with the given offset and scale parameters. | 
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| 539 | */ | 
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| 540 | static Real gaussianDistribution(Real x, Real offset = 0.0f, Real scale = 1.0f); | 
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| 541 |  | 
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| 542 | static const Real POS_INFINITY; | 
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| 543 | static const Real NEG_INFINITY; | 
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| 544 | static const Real PI; | 
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| 545 | static const Real TWO_PI; | 
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| 546 | static const Real HALF_PI; | 
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| 547 | static const Real fDeg2Rad; | 
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| 548 | static const Real fRad2Deg; | 
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| 549 |  | 
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| 550 | }; | 
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| 551 |  | 
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| 552 | // these functions must be defined down here, because they rely on the | 
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| 553 | // angle unit conversion functions in class Math: | 
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| 554 |  | 
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| 555 | inline Real Radian::valueDegrees() const | 
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| 556 | { | 
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| 557 | return Math::RadiansToDegrees ( mRad ); | 
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| 558 | } | 
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| 559 |  | 
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| 560 | inline Real Radian::valueAngleUnits() const | 
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| 561 | { | 
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| 562 | return Math::RadiansToAngleUnits ( mRad ); | 
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| 563 | } | 
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| 564 |  | 
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| 565 | inline Real Degree::valueRadians() const | 
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| 566 | { | 
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| 567 | return Math::DegreesToRadians ( mDeg ); | 
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| 568 | } | 
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| 569 |  | 
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| 570 | inline Real Degree::valueAngleUnits() const | 
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| 571 | { | 
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| 572 | return Math::DegreesToAngleUnits ( mDeg ); | 
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| 573 | } | 
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| 574 |  | 
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| 575 | inline Angle::operator Radian() const | 
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| 576 | { | 
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| 577 | return Radian(Math::AngleUnitsToRadians(mAngle)); | 
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| 578 | } | 
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| 579 |  | 
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| 580 | inline Angle::operator Degree() const | 
|---|
| 581 | { | 
|---|
| 582 | return Degree(Math::AngleUnitsToDegrees(mAngle)); | 
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| 583 | } | 
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| 584 |  | 
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| 585 | inline Radian operator * ( Real a, const Radian& b ) | 
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| 586 | { | 
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| 587 | return Radian ( a * b.valueRadians() ); | 
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| 588 | } | 
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| 589 |  | 
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| 590 | inline Radian operator / ( Real a, const Radian& b ) | 
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| 591 | { | 
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| 592 | return Radian ( a / b.valueRadians() ); | 
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| 593 | } | 
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| 594 |  | 
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| 595 | inline Degree operator * ( Real a, const Degree& b ) | 
|---|
| 596 | { | 
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| 597 | return Degree ( a * b.valueDegrees() ); | 
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| 598 | } | 
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| 599 |  | 
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| 600 | inline Degree operator / ( Real a, const Degree& b ) | 
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| 601 | { | 
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| 602 | return Degree ( a / b.valueDegrees() ); | 
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| 603 | } | 
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| 604 |  | 
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| 605 | } | 
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| 606 | #endif | 
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