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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