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 | #include "btMinkowskiPenetrationDepthSolver.h" |
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17 | #include "BulletCollision/NarrowPhaseCollision/btSubSimplexConvexCast.h" |
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18 | #include "BulletCollision/NarrowPhaseCollision/btVoronoiSimplexSolver.h" |
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19 | #include "BulletCollision/NarrowPhaseCollision/btGjkPairDetector.h" |
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20 | #include "BulletCollision/CollisionShapes/btConvexShape.h" |
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21 | |
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22 | #define NUM_UNITSPHERE_POINTS 42 |
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23 | |
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24 | |
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25 | bool btMinkowskiPenetrationDepthSolver::calcPenDepth(btSimplexSolverInterface& simplexSolver, |
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26 | const btConvexShape* convexA,const btConvexShape* convexB, |
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27 | const btTransform& transA,const btTransform& transB, |
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28 | btVector3& v, btVector3& pa, btVector3& pb, |
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29 | class btIDebugDraw* debugDraw,btStackAlloc* stackAlloc |
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30 | ) |
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31 | { |
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32 | |
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33 | (void)stackAlloc; |
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34 | (void)v; |
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35 | |
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36 | bool check2d= convexA->isConvex2d() && convexB->isConvex2d(); |
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37 | |
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38 | struct btIntermediateResult : public btDiscreteCollisionDetectorInterface::Result |
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39 | { |
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40 | |
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41 | btIntermediateResult():m_hasResult(false) |
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42 | { |
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43 | } |
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44 | |
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45 | btVector3 m_normalOnBInWorld; |
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46 | btVector3 m_pointInWorld; |
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47 | btScalar m_depth; |
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48 | bool m_hasResult; |
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49 | |
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50 | virtual void setShapeIdentifiersA(int partId0,int index0) |
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51 | { |
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52 | (void)partId0; |
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53 | (void)index0; |
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54 | } |
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55 | virtual void setShapeIdentifiersB(int partId1,int index1) |
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56 | { |
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57 | (void)partId1; |
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58 | (void)index1; |
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59 | } |
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60 | void addContactPoint(const btVector3& normalOnBInWorld,const btVector3& pointInWorld,btScalar depth) |
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61 | { |
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62 | m_normalOnBInWorld = normalOnBInWorld; |
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63 | m_pointInWorld = pointInWorld; |
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64 | m_depth = depth; |
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65 | m_hasResult = true; |
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66 | } |
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67 | }; |
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68 | |
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69 | //just take fixed number of orientation, and sample the penetration depth in that direction |
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70 | btScalar minProj = btScalar(BT_LARGE_FLOAT); |
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71 | btVector3 minNorm(btScalar(0.), btScalar(0.), btScalar(0.)); |
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72 | btVector3 minA,minB; |
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73 | btVector3 seperatingAxisInA,seperatingAxisInB; |
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74 | btVector3 pInA,qInB,pWorld,qWorld,w; |
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75 | |
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76 | #ifndef __SPU__ |
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77 | #define USE_BATCHED_SUPPORT 1 |
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78 | #endif |
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79 | #ifdef USE_BATCHED_SUPPORT |
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80 | |
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81 | btVector3 supportVerticesABatch[NUM_UNITSPHERE_POINTS+MAX_PREFERRED_PENETRATION_DIRECTIONS*2]; |
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82 | btVector3 supportVerticesBBatch[NUM_UNITSPHERE_POINTS+MAX_PREFERRED_PENETRATION_DIRECTIONS*2]; |
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83 | btVector3 seperatingAxisInABatch[NUM_UNITSPHERE_POINTS+MAX_PREFERRED_PENETRATION_DIRECTIONS*2]; |
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84 | btVector3 seperatingAxisInBBatch[NUM_UNITSPHERE_POINTS+MAX_PREFERRED_PENETRATION_DIRECTIONS*2]; |
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85 | int i; |
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86 | |
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87 | int numSampleDirections = NUM_UNITSPHERE_POINTS; |
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88 | |
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89 | for (i=0;i<numSampleDirections;i++) |
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90 | { |
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91 | btVector3 norm = getPenetrationDirections()[i]; |
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92 | seperatingAxisInABatch[i] = (-norm) * transA.getBasis() ; |
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93 | seperatingAxisInBBatch[i] = norm * transB.getBasis() ; |
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94 | } |
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95 | |
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96 | { |
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97 | int numPDA = convexA->getNumPreferredPenetrationDirections(); |
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98 | if (numPDA) |
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99 | { |
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100 | for (int i=0;i<numPDA;i++) |
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101 | { |
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102 | btVector3 norm; |
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103 | convexA->getPreferredPenetrationDirection(i,norm); |
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104 | norm = transA.getBasis() * norm; |
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105 | getPenetrationDirections()[numSampleDirections] = norm; |
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106 | seperatingAxisInABatch[numSampleDirections] = (-norm) * transA.getBasis(); |
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107 | seperatingAxisInBBatch[numSampleDirections] = norm * transB.getBasis(); |
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108 | numSampleDirections++; |
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109 | } |
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110 | } |
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111 | } |
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112 | |
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113 | { |
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114 | int numPDB = convexB->getNumPreferredPenetrationDirections(); |
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115 | if (numPDB) |
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116 | { |
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117 | for (int i=0;i<numPDB;i++) |
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118 | { |
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119 | btVector3 norm; |
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120 | convexB->getPreferredPenetrationDirection(i,norm); |
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121 | norm = transB.getBasis() * norm; |
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122 | getPenetrationDirections()[numSampleDirections] = norm; |
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123 | seperatingAxisInABatch[numSampleDirections] = (-norm) * transA.getBasis(); |
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124 | seperatingAxisInBBatch[numSampleDirections] = norm * transB.getBasis(); |
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125 | numSampleDirections++; |
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126 | } |
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127 | } |
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128 | } |
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129 | |
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130 | |
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131 | |
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132 | |
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133 | convexA->batchedUnitVectorGetSupportingVertexWithoutMargin(seperatingAxisInABatch,supportVerticesABatch,numSampleDirections); |
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134 | convexB->batchedUnitVectorGetSupportingVertexWithoutMargin(seperatingAxisInBBatch,supportVerticesBBatch,numSampleDirections); |
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135 | |
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136 | for (i=0;i<numSampleDirections;i++) |
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137 | { |
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138 | btVector3 norm = getPenetrationDirections()[i]; |
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139 | if (check2d) |
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140 | { |
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141 | norm[2] = 0.f; |
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142 | } |
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143 | if (norm.length2()>0.01) |
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144 | { |
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145 | |
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146 | seperatingAxisInA = seperatingAxisInABatch[i]; |
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147 | seperatingAxisInB = seperatingAxisInBBatch[i]; |
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148 | |
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149 | pInA = supportVerticesABatch[i]; |
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150 | qInB = supportVerticesBBatch[i]; |
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151 | |
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152 | pWorld = transA(pInA); |
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153 | qWorld = transB(qInB); |
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154 | if (check2d) |
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155 | { |
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156 | pWorld[2] = 0.f; |
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157 | qWorld[2] = 0.f; |
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158 | } |
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159 | |
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160 | w = qWorld - pWorld; |
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161 | btScalar delta = norm.dot(w); |
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162 | //find smallest delta |
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163 | if (delta < minProj) |
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164 | { |
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165 | minProj = delta; |
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166 | minNorm = norm; |
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167 | minA = pWorld; |
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168 | minB = qWorld; |
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169 | } |
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170 | } |
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171 | } |
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172 | #else |
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173 | |
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174 | int numSampleDirections = NUM_UNITSPHERE_POINTS; |
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175 | |
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176 | #ifndef __SPU__ |
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177 | { |
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178 | int numPDA = convexA->getNumPreferredPenetrationDirections(); |
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179 | if (numPDA) |
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180 | { |
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181 | for (int i=0;i<numPDA;i++) |
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182 | { |
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183 | btVector3 norm; |
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184 | convexA->getPreferredPenetrationDirection(i,norm); |
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185 | norm = transA.getBasis() * norm; |
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186 | getPenetrationDirections()[numSampleDirections] = norm; |
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187 | numSampleDirections++; |
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188 | } |
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189 | } |
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190 | } |
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191 | |
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192 | { |
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193 | int numPDB = convexB->getNumPreferredPenetrationDirections(); |
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194 | if (numPDB) |
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195 | { |
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196 | for (int i=0;i<numPDB;i++) |
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197 | { |
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198 | btVector3 norm; |
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199 | convexB->getPreferredPenetrationDirection(i,norm); |
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200 | norm = transB.getBasis() * norm; |
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201 | getPenetrationDirections()[numSampleDirections] = norm; |
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202 | numSampleDirections++; |
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203 | } |
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204 | } |
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205 | } |
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206 | #endif // __SPU__ |
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207 | |
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208 | for (int i=0;i<numSampleDirections;i++) |
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209 | { |
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210 | const btVector3& norm = getPenetrationDirections()[i]; |
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211 | seperatingAxisInA = (-norm)* transA.getBasis(); |
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212 | seperatingAxisInB = norm* transB.getBasis(); |
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213 | pInA = convexA->localGetSupportVertexWithoutMarginNonVirtual(seperatingAxisInA); |
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214 | qInB = convexB->localGetSupportVertexWithoutMarginNonVirtual(seperatingAxisInB); |
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215 | pWorld = transA(pInA); |
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216 | qWorld = transB(qInB); |
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217 | w = qWorld - pWorld; |
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218 | btScalar delta = norm.dot(w); |
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219 | //find smallest delta |
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220 | if (delta < minProj) |
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221 | { |
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222 | minProj = delta; |
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223 | minNorm = norm; |
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224 | minA = pWorld; |
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225 | minB = qWorld; |
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226 | } |
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227 | } |
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228 | #endif //USE_BATCHED_SUPPORT |
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229 | |
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230 | //add the margins |
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231 | |
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232 | minA += minNorm*convexA->getMarginNonVirtual(); |
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233 | minB -= minNorm*convexB->getMarginNonVirtual(); |
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234 | //no penetration |
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235 | if (minProj < btScalar(0.)) |
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236 | return false; |
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237 | |
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238 | btScalar extraSeparation = 0.5f;///scale dependent |
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239 | minProj += extraSeparation+(convexA->getMarginNonVirtual() + convexB->getMarginNonVirtual()); |
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240 | |
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241 | |
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242 | |
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243 | |
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244 | |
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245 | //#define DEBUG_DRAW 1 |
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246 | #ifdef DEBUG_DRAW |
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247 | if (debugDraw) |
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248 | { |
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249 | btVector3 color(0,1,0); |
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250 | debugDraw->drawLine(minA,minB,color); |
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251 | color = btVector3 (1,1,1); |
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252 | btVector3 vec = minB-minA; |
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253 | btScalar prj2 = minNorm.dot(vec); |
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254 | debugDraw->drawLine(minA,minA+(minNorm*minProj),color); |
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255 | |
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256 | } |
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257 | #endif //DEBUG_DRAW |
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258 | |
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259 | |
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260 | |
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261 | btGjkPairDetector gjkdet(convexA,convexB,&simplexSolver,0); |
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262 | |
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263 | btScalar offsetDist = minProj; |
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264 | btVector3 offset = minNorm * offsetDist; |
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265 | |
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266 | |
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267 | |
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268 | btGjkPairDetector::ClosestPointInput input; |
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269 | |
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270 | btVector3 newOrg = transA.getOrigin() + offset; |
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271 | |
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272 | btTransform displacedTrans = transA; |
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273 | displacedTrans.setOrigin(newOrg); |
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274 | |
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275 | input.m_transformA = displacedTrans; |
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276 | input.m_transformB = transB; |
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277 | input.m_maximumDistanceSquared = btScalar(BT_LARGE_FLOAT);//minProj; |
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278 | |
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279 | btIntermediateResult res; |
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280 | gjkdet.setCachedSeperatingAxis(-minNorm); |
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281 | gjkdet.getClosestPoints(input,res,debugDraw); |
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282 | |
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283 | btScalar correctedMinNorm = minProj - res.m_depth; |
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284 | |
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285 | |
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286 | //the penetration depth is over-estimated, relax it |
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287 | btScalar penetration_relaxation= btScalar(1.); |
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288 | minNorm*=penetration_relaxation; |
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289 | |
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290 | |
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291 | if (res.m_hasResult) |
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292 | { |
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293 | |
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294 | pa = res.m_pointInWorld - minNorm * correctedMinNorm; |
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295 | pb = res.m_pointInWorld; |
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296 | v = minNorm; |
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297 | |
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298 | #ifdef DEBUG_DRAW |
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299 | if (debugDraw) |
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300 | { |
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301 | btVector3 color(1,0,0); |
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302 | debugDraw->drawLine(pa,pb,color); |
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303 | } |
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304 | #endif//DEBUG_DRAW |
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305 | |
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306 | |
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307 | } |
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308 | return res.m_hasResult; |
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309 | } |
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310 | |
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311 | btVector3* btMinkowskiPenetrationDepthSolver::getPenetrationDirections() |
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312 | { |
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313 | static btVector3 sPenetrationDirections[NUM_UNITSPHERE_POINTS+MAX_PREFERRED_PENETRATION_DIRECTIONS*2] = |
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314 | { |
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315 | btVector3(btScalar(0.000000) , btScalar(-0.000000),btScalar(-1.000000)), |
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316 | btVector3(btScalar(0.723608) , btScalar(-0.525725),btScalar(-0.447219)), |
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317 | btVector3(btScalar(-0.276388) , btScalar(-0.850649),btScalar(-0.447219)), |
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318 | btVector3(btScalar(-0.894426) , btScalar(-0.000000),btScalar(-0.447216)), |
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319 | btVector3(btScalar(-0.276388) , btScalar(0.850649),btScalar(-0.447220)), |
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320 | btVector3(btScalar(0.723608) , btScalar(0.525725),btScalar(-0.447219)), |
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321 | btVector3(btScalar(0.276388) , btScalar(-0.850649),btScalar(0.447220)), |
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322 | btVector3(btScalar(-0.723608) , btScalar(-0.525725),btScalar(0.447219)), |
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323 | btVector3(btScalar(-0.723608) , btScalar(0.525725),btScalar(0.447219)), |
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324 | btVector3(btScalar(0.276388) , btScalar(0.850649),btScalar(0.447219)), |
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325 | btVector3(btScalar(0.894426) , btScalar(0.000000),btScalar(0.447216)), |
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326 | btVector3(btScalar(-0.000000) , btScalar(0.000000),btScalar(1.000000)), |
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327 | btVector3(btScalar(0.425323) , btScalar(-0.309011),btScalar(-0.850654)), |
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328 | btVector3(btScalar(-0.162456) , btScalar(-0.499995),btScalar(-0.850654)), |
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329 | btVector3(btScalar(0.262869) , btScalar(-0.809012),btScalar(-0.525738)), |
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330 | btVector3(btScalar(0.425323) , btScalar(0.309011),btScalar(-0.850654)), |
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331 | btVector3(btScalar(0.850648) , btScalar(-0.000000),btScalar(-0.525736)), |
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332 | btVector3(btScalar(-0.525730) , btScalar(-0.000000),btScalar(-0.850652)), |
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333 | btVector3(btScalar(-0.688190) , btScalar(-0.499997),btScalar(-0.525736)), |
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334 | btVector3(btScalar(-0.162456) , btScalar(0.499995),btScalar(-0.850654)), |
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335 | btVector3(btScalar(-0.688190) , btScalar(0.499997),btScalar(-0.525736)), |
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336 | btVector3(btScalar(0.262869) , btScalar(0.809012),btScalar(-0.525738)), |
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337 | btVector3(btScalar(0.951058) , btScalar(0.309013),btScalar(0.000000)), |
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338 | btVector3(btScalar(0.951058) , btScalar(-0.309013),btScalar(0.000000)), |
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339 | btVector3(btScalar(0.587786) , btScalar(-0.809017),btScalar(0.000000)), |
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340 | btVector3(btScalar(0.000000) , btScalar(-1.000000),btScalar(0.000000)), |
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341 | btVector3(btScalar(-0.587786) , btScalar(-0.809017),btScalar(0.000000)), |
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342 | btVector3(btScalar(-0.951058) , btScalar(-0.309013),btScalar(-0.000000)), |
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343 | btVector3(btScalar(-0.951058) , btScalar(0.309013),btScalar(-0.000000)), |
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344 | btVector3(btScalar(-0.587786) , btScalar(0.809017),btScalar(-0.000000)), |
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345 | btVector3(btScalar(-0.000000) , btScalar(1.000000),btScalar(-0.000000)), |
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346 | btVector3(btScalar(0.587786) , btScalar(0.809017),btScalar(-0.000000)), |
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347 | btVector3(btScalar(0.688190) , btScalar(-0.499997),btScalar(0.525736)), |
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348 | btVector3(btScalar(-0.262869) , btScalar(-0.809012),btScalar(0.525738)), |
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349 | btVector3(btScalar(-0.850648) , btScalar(0.000000),btScalar(0.525736)), |
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350 | btVector3(btScalar(-0.262869) , btScalar(0.809012),btScalar(0.525738)), |
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351 | btVector3(btScalar(0.688190) , btScalar(0.499997),btScalar(0.525736)), |
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352 | btVector3(btScalar(0.525730) , btScalar(0.000000),btScalar(0.850652)), |
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353 | btVector3(btScalar(0.162456) , btScalar(-0.499995),btScalar(0.850654)), |
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354 | btVector3(btScalar(-0.425323) , btScalar(-0.309011),btScalar(0.850654)), |
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355 | btVector3(btScalar(-0.425323) , btScalar(0.309011),btScalar(0.850654)), |
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356 | btVector3(btScalar(0.162456) , btScalar(0.499995),btScalar(0.850654)) |
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357 | }; |
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358 | |
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359 | return sPenetrationDirections; |
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360 | } |
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361 | |
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362 | |
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