| 1 | /* | 
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| 2 | Bullet Continuous Collision Detection and Physics Library | 
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| 3 | Copyright (c) 2003-2006 Erwin Coumans  http://continuousphysics.com/Bullet/ | 
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| 4 |  | 
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| 5 | This software is provided 'as-is', without any express or implied warranty. | 
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| 6 | In no event will the authors be held liable for any damages arising from the use of this software. | 
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| 7 | Permission is granted to anyone to use this software for any purpose, | 
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| 8 | including commercial applications, and to alter it and redistribute it freely, | 
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| 9 | subject to the following restrictions: | 
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| 10 |  | 
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| 11 | 1. The origin of this software must not be misrepresented; you must not claim that you wrote the original software. If you use this software in a product, an acknowledgment in the product documentation would be appreciated but is not required. | 
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| 12 | 2. Altered source versions must be plainly marked as such, and must not be misrepresented as being the original software. | 
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| 13 | 3. This notice may not be removed or altered from any source distribution. | 
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| 14 | */ | 
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| 15 |  | 
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| 16 | #ifndef BT_OBB_BOX_2D_SHAPE_H | 
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| 17 | #define BT_OBB_BOX_2D_SHAPE_H | 
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| 18 |  | 
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| 19 | #include "BulletCollision/CollisionShapes/btPolyhedralConvexShape.h" | 
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| 20 | #include "BulletCollision/CollisionShapes/btCollisionMargin.h" | 
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| 21 | #include "BulletCollision/BroadphaseCollision/btBroadphaseProxy.h" | 
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| 22 | #include "LinearMath/btVector3.h" | 
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| 23 | #include "LinearMath/btMinMax.h" | 
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| 24 |  | 
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| 25 | ///The btBox2dShape is a box primitive around the origin, its sides axis aligned with length specified by half extents, in local shape coordinates. When used as part of a btCollisionObject or btRigidBody it will be an oriented box in world space. | 
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| 26 | class btBox2dShape: public btPolyhedralConvexShape | 
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| 27 | { | 
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| 28 |  | 
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| 29 | //btVector3     m_boxHalfExtents1; //use m_implicitShapeDimensions instead | 
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| 30 |  | 
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| 31 | btVector3 m_centroid; | 
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| 32 | btVector3 m_vertices[4]; | 
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| 33 | btVector3 m_normals[4]; | 
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| 34 |  | 
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| 35 | public: | 
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| 36 |  | 
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| 37 | btVector3 getHalfExtentsWithMargin() const | 
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| 38 | { | 
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| 39 | btVector3 halfExtents = getHalfExtentsWithoutMargin(); | 
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| 40 | btVector3 margin(getMargin(),getMargin(),getMargin()); | 
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| 41 | halfExtents += margin; | 
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| 42 | return halfExtents; | 
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| 43 | } | 
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| 44 |  | 
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| 45 | const btVector3& getHalfExtentsWithoutMargin() const | 
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| 46 | { | 
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| 47 | return m_implicitShapeDimensions;//changed in Bullet 2.63: assume the scaling and margin are included | 
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| 48 | } | 
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| 49 |  | 
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| 50 |  | 
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| 51 | virtual btVector3       localGetSupportingVertex(const btVector3& vec) const | 
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| 52 | { | 
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| 53 | btVector3 halfExtents = getHalfExtentsWithoutMargin(); | 
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| 54 | btVector3 margin(getMargin(),getMargin(),getMargin()); | 
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| 55 | halfExtents += margin; | 
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| 56 |  | 
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| 57 | return btVector3(btFsels(vec.x(), halfExtents.x(), -halfExtents.x()), | 
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| 58 | btFsels(vec.y(), halfExtents.y(), -halfExtents.y()), | 
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| 59 | btFsels(vec.z(), halfExtents.z(), -halfExtents.z())); | 
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| 60 | } | 
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| 61 |  | 
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| 62 | SIMD_FORCE_INLINE  btVector3    localGetSupportingVertexWithoutMargin(const btVector3& vec)const | 
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| 63 | { | 
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| 64 | const btVector3& halfExtents = getHalfExtentsWithoutMargin(); | 
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| 65 |  | 
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| 66 | return btVector3(btFsels(vec.x(), halfExtents.x(), -halfExtents.x()), | 
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| 67 | btFsels(vec.y(), halfExtents.y(), -halfExtents.y()), | 
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| 68 | btFsels(vec.z(), halfExtents.z(), -halfExtents.z())); | 
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| 69 | } | 
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| 70 |  | 
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| 71 | virtual void    batchedUnitVectorGetSupportingVertexWithoutMargin(const btVector3* vectors,btVector3* supportVerticesOut,int numVectors) const | 
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| 72 | { | 
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| 73 | const btVector3& halfExtents = getHalfExtentsWithoutMargin(); | 
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| 74 |  | 
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| 75 | for (int i=0;i<numVectors;i++) | 
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| 76 | { | 
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| 77 | const btVector3& vec = vectors[i]; | 
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| 78 | supportVerticesOut[i].setValue(btFsels(vec.x(), halfExtents.x(), -halfExtents.x()), | 
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| 79 | btFsels(vec.y(), halfExtents.y(), -halfExtents.y()), | 
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| 80 | btFsels(vec.z(), halfExtents.z(), -halfExtents.z())); | 
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| 81 | } | 
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| 82 |  | 
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| 83 | } | 
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| 84 |  | 
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| 85 |  | 
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| 86 | btBox2dShape( const btVector3& boxHalfExtents) | 
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| 87 | : btPolyhedralConvexShape(), | 
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| 88 | m_centroid(0,0,0) | 
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| 89 | { | 
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| 90 | m_vertices[0].setValue(-boxHalfExtents.getX(),-boxHalfExtents.getY(),0); | 
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| 91 | m_vertices[1].setValue(boxHalfExtents.getX(),-boxHalfExtents.getY(),0); | 
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| 92 | m_vertices[2].setValue(boxHalfExtents.getX(),boxHalfExtents.getY(),0); | 
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| 93 | m_vertices[3].setValue(-boxHalfExtents.getX(),boxHalfExtents.getY(),0); | 
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| 94 |  | 
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| 95 | m_normals[0].setValue(0,-1,0); | 
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| 96 | m_normals[1].setValue(1,0,0); | 
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| 97 | m_normals[2].setValue(0,1,0); | 
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| 98 | m_normals[3].setValue(-1,0,0); | 
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| 99 |  | 
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| 100 | m_shapeType = BOX_2D_SHAPE_PROXYTYPE; | 
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| 101 | btVector3 margin(getMargin(),getMargin(),getMargin()); | 
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| 102 | m_implicitShapeDimensions = (boxHalfExtents * m_localScaling) - margin; | 
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| 103 | }; | 
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| 104 |  | 
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| 105 | virtual void setMargin(btScalar collisionMargin) | 
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| 106 | { | 
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| 107 | //correct the m_implicitShapeDimensions for the margin | 
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| 108 | btVector3 oldMargin(getMargin(),getMargin(),getMargin()); | 
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| 109 | btVector3 implicitShapeDimensionsWithMargin = m_implicitShapeDimensions+oldMargin; | 
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| 110 |  | 
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| 111 | btConvexInternalShape::setMargin(collisionMargin); | 
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| 112 | btVector3 newMargin(getMargin(),getMargin(),getMargin()); | 
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| 113 | m_implicitShapeDimensions = implicitShapeDimensionsWithMargin - newMargin; | 
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| 114 |  | 
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| 115 | } | 
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| 116 | virtual void    setLocalScaling(const btVector3& scaling) | 
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| 117 | { | 
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| 118 | btVector3 oldMargin(getMargin(),getMargin(),getMargin()); | 
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| 119 | btVector3 implicitShapeDimensionsWithMargin = m_implicitShapeDimensions+oldMargin; | 
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| 120 | btVector3 unScaledImplicitShapeDimensionsWithMargin = implicitShapeDimensionsWithMargin / m_localScaling; | 
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| 121 |  | 
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| 122 | btConvexInternalShape::setLocalScaling(scaling); | 
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| 123 |  | 
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| 124 | m_implicitShapeDimensions = (unScaledImplicitShapeDimensionsWithMargin * m_localScaling) - oldMargin; | 
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| 125 |  | 
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| 126 | } | 
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| 127 |  | 
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| 128 | virtual void getAabb(const btTransform& t,btVector3& aabbMin,btVector3& aabbMax) const; | 
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| 129 |  | 
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| 130 |  | 
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| 131 |  | 
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| 132 | virtual void    calculateLocalInertia(btScalar mass,btVector3& inertia) const; | 
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| 133 |  | 
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| 134 |  | 
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| 135 |  | 
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| 136 |  | 
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| 137 |  | 
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| 138 | int     getVertexCount() const | 
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| 139 | { | 
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| 140 | return 4; | 
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| 141 | } | 
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| 142 |  | 
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| 143 | virtual int getNumVertices()const | 
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| 144 | { | 
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| 145 | return 4; | 
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| 146 | } | 
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| 147 |  | 
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| 148 | const btVector3* getVertices() const | 
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| 149 | { | 
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| 150 | return &m_vertices[0]; | 
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| 151 | } | 
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| 152 |  | 
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| 153 | const btVector3* getNormals() const | 
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| 154 | { | 
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| 155 | return &m_normals[0]; | 
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| 156 | } | 
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| 157 |  | 
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| 158 |  | 
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| 159 |  | 
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| 160 |  | 
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| 161 |  | 
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| 162 |  | 
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| 163 |  | 
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| 164 | virtual void getPlane(btVector3& planeNormal,btVector3& planeSupport,int i ) const | 
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| 165 | { | 
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| 166 | //this plane might not be aligned... | 
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| 167 | btVector4 plane ; | 
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| 168 | getPlaneEquation(plane,i); | 
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| 169 | planeNormal = btVector3(plane.getX(),plane.getY(),plane.getZ()); | 
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| 170 | planeSupport = localGetSupportingVertex(-planeNormal); | 
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| 171 | } | 
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| 172 |  | 
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| 173 |  | 
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| 174 | const btVector3& getCentroid() const | 
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| 175 | { | 
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| 176 | return m_centroid; | 
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| 177 | } | 
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| 178 |  | 
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| 179 | virtual int getNumPlanes() const | 
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| 180 | { | 
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| 181 | return 6; | 
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| 182 | } | 
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| 183 |  | 
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| 184 |  | 
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| 185 |  | 
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| 186 | virtual int getNumEdges() const | 
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| 187 | { | 
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| 188 | return 12; | 
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| 189 | } | 
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| 190 |  | 
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| 191 |  | 
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| 192 | virtual void getVertex(int i,btVector3& vtx) const | 
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| 193 | { | 
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| 194 | btVector3 halfExtents = getHalfExtentsWithoutMargin(); | 
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| 195 |  | 
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| 196 | vtx = btVector3( | 
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| 197 | halfExtents.x() * (1-(i&1)) - halfExtents.x() * (i&1), | 
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| 198 | halfExtents.y() * (1-((i&2)>>1)) - halfExtents.y() * ((i&2)>>1), | 
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| 199 | halfExtents.z() * (1-((i&4)>>2)) - halfExtents.z() * ((i&4)>>2)); | 
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| 200 | } | 
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| 201 |  | 
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| 202 |  | 
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| 203 | virtual void    getPlaneEquation(btVector4& plane,int i) const | 
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| 204 | { | 
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| 205 | btVector3 halfExtents = getHalfExtentsWithoutMargin(); | 
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| 206 |  | 
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| 207 | switch (i) | 
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| 208 | { | 
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| 209 | case 0: | 
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| 210 | plane.setValue(btScalar(1.),btScalar(0.),btScalar(0.),-halfExtents.x()); | 
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| 211 | break; | 
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| 212 | case 1: | 
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| 213 | plane.setValue(btScalar(-1.),btScalar(0.),btScalar(0.),-halfExtents.x()); | 
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| 214 | break; | 
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| 215 | case 2: | 
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| 216 | plane.setValue(btScalar(0.),btScalar(1.),btScalar(0.),-halfExtents.y()); | 
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| 217 | break; | 
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| 218 | case 3: | 
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| 219 | plane.setValue(btScalar(0.),btScalar(-1.),btScalar(0.),-halfExtents.y()); | 
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| 220 | break; | 
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| 221 | case 4: | 
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| 222 | plane.setValue(btScalar(0.),btScalar(0.),btScalar(1.),-halfExtents.z()); | 
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| 223 | break; | 
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| 224 | case 5: | 
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| 225 | plane.setValue(btScalar(0.),btScalar(0.),btScalar(-1.),-halfExtents.z()); | 
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| 226 | break; | 
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| 227 | default: | 
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| 228 | btAssert(0); | 
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| 229 | } | 
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| 230 | } | 
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| 231 |  | 
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| 232 |  | 
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| 233 | virtual void getEdge(int i,btVector3& pa,btVector3& pb) const | 
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| 234 | //virtual void getEdge(int i,Edge& edge) const | 
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| 235 | { | 
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| 236 | int edgeVert0 = 0; | 
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| 237 | int edgeVert1 = 0; | 
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| 238 |  | 
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| 239 | switch (i) | 
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| 240 | { | 
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| 241 | case 0: | 
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| 242 | edgeVert0 = 0; | 
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| 243 | edgeVert1 = 1; | 
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| 244 | break; | 
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| 245 | case 1: | 
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| 246 | edgeVert0 = 0; | 
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| 247 | edgeVert1 = 2; | 
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| 248 | break; | 
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| 249 | case 2: | 
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| 250 | edgeVert0 = 1; | 
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| 251 | edgeVert1 = 3; | 
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| 252 |  | 
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| 253 | break; | 
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| 254 | case 3: | 
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| 255 | edgeVert0 = 2; | 
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| 256 | edgeVert1 = 3; | 
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| 257 | break; | 
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| 258 | case 4: | 
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| 259 | edgeVert0 = 0; | 
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| 260 | edgeVert1 = 4; | 
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| 261 | break; | 
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| 262 | case 5: | 
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| 263 | edgeVert0 = 1; | 
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| 264 | edgeVert1 = 5; | 
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| 265 |  | 
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| 266 | break; | 
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| 267 | case 6: | 
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| 268 | edgeVert0 = 2; | 
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| 269 | edgeVert1 = 6; | 
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| 270 | break; | 
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| 271 | case 7: | 
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| 272 | edgeVert0 = 3; | 
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| 273 | edgeVert1 = 7; | 
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| 274 | break; | 
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| 275 | case 8: | 
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| 276 | edgeVert0 = 4; | 
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| 277 | edgeVert1 = 5; | 
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| 278 | break; | 
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| 279 | case 9: | 
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| 280 | edgeVert0 = 4; | 
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| 281 | edgeVert1 = 6; | 
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| 282 | break; | 
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| 283 | case 10: | 
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| 284 | edgeVert0 = 5; | 
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| 285 | edgeVert1 = 7; | 
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| 286 | break; | 
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| 287 | case 11: | 
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| 288 | edgeVert0 = 6; | 
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| 289 | edgeVert1 = 7; | 
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| 290 | break; | 
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| 291 | default: | 
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| 292 | btAssert(0); | 
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| 293 |  | 
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| 294 | } | 
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| 295 |  | 
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| 296 | getVertex(edgeVert0,pa ); | 
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| 297 | getVertex(edgeVert1,pb ); | 
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| 298 | } | 
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| 299 |  | 
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| 300 |  | 
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| 301 |  | 
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| 302 |  | 
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| 303 |  | 
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| 304 | virtual bool isInside(const btVector3& pt,btScalar tolerance) const | 
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| 305 | { | 
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| 306 | btVector3 halfExtents = getHalfExtentsWithoutMargin(); | 
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| 307 |  | 
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| 308 | //btScalar minDist = 2*tolerance; | 
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| 309 |  | 
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| 310 | bool result =   (pt.x() <= (halfExtents.x()+tolerance)) && | 
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| 311 | (pt.x() >= (-halfExtents.x()-tolerance)) && | 
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| 312 | (pt.y() <= (halfExtents.y()+tolerance)) && | 
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| 313 | (pt.y() >= (-halfExtents.y()-tolerance)) && | 
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| 314 | (pt.z() <= (halfExtents.z()+tolerance)) && | 
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| 315 | (pt.z() >= (-halfExtents.z()-tolerance)); | 
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| 316 |  | 
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| 317 | return result; | 
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| 318 | } | 
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| 319 |  | 
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| 320 |  | 
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| 321 | //debugging | 
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| 322 | virtual const char*     getName()const | 
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| 323 | { | 
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| 324 | return "Box2d"; | 
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| 325 | } | 
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| 326 |  | 
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| 327 | virtual int             getNumPreferredPenetrationDirections() const | 
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| 328 | { | 
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| 329 | return 6; | 
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| 330 | } | 
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| 331 |  | 
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| 332 | virtual void    getPreferredPenetrationDirection(int index, btVector3& penetrationVector) const | 
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| 333 | { | 
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| 334 | switch (index) | 
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| 335 | { | 
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| 336 | case 0: | 
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| 337 | penetrationVector.setValue(btScalar(1.),btScalar(0.),btScalar(0.)); | 
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| 338 | break; | 
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| 339 | case 1: | 
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| 340 | penetrationVector.setValue(btScalar(-1.),btScalar(0.),btScalar(0.)); | 
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| 341 | break; | 
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| 342 | case 2: | 
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| 343 | penetrationVector.setValue(btScalar(0.),btScalar(1.),btScalar(0.)); | 
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| 344 | break; | 
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| 345 | case 3: | 
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| 346 | penetrationVector.setValue(btScalar(0.),btScalar(-1.),btScalar(0.)); | 
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| 347 | break; | 
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| 348 | case 4: | 
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| 349 | penetrationVector.setValue(btScalar(0.),btScalar(0.),btScalar(1.)); | 
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| 350 | break; | 
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| 351 | case 5: | 
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| 352 | penetrationVector.setValue(btScalar(0.),btScalar(0.),btScalar(-1.)); | 
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| 353 | break; | 
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| 354 | default: | 
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| 355 | btAssert(0); | 
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| 356 | } | 
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| 357 | } | 
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| 358 |  | 
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| 359 | }; | 
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| 360 |  | 
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| 361 | #endif //BT_OBB_BOX_2D_SHAPE_H | 
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| 362 |  | 
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| 363 |  | 
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