| 1 | #include "btInternalEdgeUtility.h" |
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| 2 | |
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| 3 | #include "BulletCollision/CollisionShapes/btBvhTriangleMeshShape.h" |
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| 4 | #include "BulletCollision/CollisionShapes/btTriangleShape.h" |
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| 5 | #include "BulletCollision/CollisionDispatch/btCollisionObject.h" |
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| 6 | #include "BulletCollision/NarrowPhaseCollision/btManifoldPoint.h" |
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| 7 | #include "LinearMath/btIDebugDraw.h" |
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| 8 | |
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| 9 | |
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| 10 | //#define DEBUG_INTERNAL_EDGE |
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| 11 | |
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| 12 | |
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| 13 | #ifdef DEBUG_INTERNAL_EDGE |
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| 14 | #include <stdio.h> |
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| 15 | #endif //DEBUG_INTERNAL_EDGE |
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| 16 | |
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| 17 | |
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| 18 | #ifdef BT_INTERNAL_EDGE_DEBUG_DRAW |
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| 19 | static btIDebugDraw* gDebugDrawer = 0; |
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| 20 | |
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| 21 | void btSetDebugDrawer(btIDebugDraw* debugDrawer) |
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| 22 | { |
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| 23 | gDebugDrawer = debugDrawer; |
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| 24 | } |
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| 25 | |
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| 26 | static void btDebugDrawLine(const btVector3& from,const btVector3& to, const btVector3& color) |
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| 27 | { |
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| 28 | if (gDebugDrawer) |
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| 29 | gDebugDrawer->drawLine(from,to,color); |
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| 30 | } |
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| 31 | #endif //BT_INTERNAL_EDGE_DEBUG_DRAW |
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| 32 | |
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| 33 | |
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| 34 | static int btGetHash(int partId, int triangleIndex) |
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| 35 | { |
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| 36 | int hash = (partId<<(31-MAX_NUM_PARTS_IN_BITS)) | triangleIndex; |
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| 37 | return hash; |
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| 38 | } |
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| 39 | |
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| 40 | |
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| 41 | |
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| 42 | static btScalar btGetAngle(const btVector3& edgeA, const btVector3& normalA,const btVector3& normalB) |
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| 43 | { |
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| 44 | const btVector3 refAxis0 = edgeA; |
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| 45 | const btVector3 refAxis1 = normalA; |
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| 46 | const btVector3 swingAxis = normalB; |
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| 47 | btScalar angle = btAtan2(swingAxis.dot(refAxis0), swingAxis.dot(refAxis1)); |
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| 48 | return angle; |
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| 49 | } |
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| 50 | |
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| 51 | |
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| 52 | struct btConnectivityProcessor : public btTriangleCallback |
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| 53 | { |
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| 54 | int m_partIdA; |
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| 55 | int m_triangleIndexA; |
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| 56 | btVector3* m_triangleVerticesA; |
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| 57 | btTriangleInfoMap* m_triangleInfoMap; |
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| 58 | |
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| 59 | |
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| 60 | virtual void processTriangle(btVector3* triangle, int partId, int triangleIndex) |
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| 61 | { |
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| 62 | //skip self-collisions |
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| 63 | if ((m_partIdA == partId) && (m_triangleIndexA == triangleIndex)) |
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| 64 | return; |
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| 65 | |
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| 66 | //skip duplicates (disabled for now) |
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| 67 | //if ((m_partIdA <= partId) && (m_triangleIndexA <= triangleIndex)) |
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| 68 | // return; |
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| 69 | |
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| 70 | //search for shared vertices and edges |
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| 71 | int numshared = 0; |
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| 72 | int sharedVertsA[3]={-1,-1,-1}; |
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| 73 | int sharedVertsB[3]={-1,-1,-1}; |
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| 74 | |
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| 75 | ///skip degenerate triangles |
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| 76 | btScalar crossBSqr = ((triangle[1]-triangle[0]).cross(triangle[2]-triangle[0])).length2(); |
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| 77 | if (crossBSqr < m_triangleInfoMap->m_equalVertexThreshold) |
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| 78 | return; |
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| 79 | |
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| 80 | |
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| 81 | btScalar crossASqr = ((m_triangleVerticesA[1]-m_triangleVerticesA[0]).cross(m_triangleVerticesA[2]-m_triangleVerticesA[0])).length2(); |
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| 82 | ///skip degenerate triangles |
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| 83 | if (crossASqr< m_triangleInfoMap->m_equalVertexThreshold) |
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| 84 | return; |
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| 85 | |
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| 86 | #if 0 |
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| 87 | printf("triangle A[0] = (%f,%f,%f)\ntriangle A[1] = (%f,%f,%f)\ntriangle A[2] = (%f,%f,%f)\n", |
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| 88 | m_triangleVerticesA[0].getX(),m_triangleVerticesA[0].getY(),m_triangleVerticesA[0].getZ(), |
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| 89 | m_triangleVerticesA[1].getX(),m_triangleVerticesA[1].getY(),m_triangleVerticesA[1].getZ(), |
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| 90 | m_triangleVerticesA[2].getX(),m_triangleVerticesA[2].getY(),m_triangleVerticesA[2].getZ()); |
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| 91 | |
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| 92 | printf("partId=%d, triangleIndex=%d\n",partId,triangleIndex); |
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| 93 | printf("triangle B[0] = (%f,%f,%f)\ntriangle B[1] = (%f,%f,%f)\ntriangle B[2] = (%f,%f,%f)\n", |
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| 94 | triangle[0].getX(),triangle[0].getY(),triangle[0].getZ(), |
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| 95 | triangle[1].getX(),triangle[1].getY(),triangle[1].getZ(), |
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| 96 | triangle[2].getX(),triangle[2].getY(),triangle[2].getZ()); |
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| 97 | #endif |
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| 98 | |
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| 99 | for (int i=0;i<3;i++) |
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| 100 | { |
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| 101 | for (int j=0;j<3;j++) |
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| 102 | { |
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| 103 | if ( (m_triangleVerticesA[i]-triangle[j]).length2() < m_triangleInfoMap->m_equalVertexThreshold) |
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| 104 | { |
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| 105 | sharedVertsA[numshared] = i; |
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| 106 | sharedVertsB[numshared] = j; |
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| 107 | numshared++; |
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| 108 | ///degenerate case |
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| 109 | if(numshared >= 3) |
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| 110 | return; |
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| 111 | } |
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| 112 | } |
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| 113 | ///degenerate case |
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| 114 | if(numshared >= 3) |
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| 115 | return; |
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| 116 | } |
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| 117 | switch (numshared) |
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| 118 | { |
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| 119 | case 0: |
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| 120 | { |
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| 121 | break; |
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| 122 | } |
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| 123 | case 1: |
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| 124 | { |
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| 125 | //shared vertex |
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| 126 | break; |
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| 127 | } |
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| 128 | case 2: |
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| 129 | { |
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| 130 | //shared edge |
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| 131 | //we need to make sure the edge is in the order V2V0 and not V0V2 so that the signs are correct |
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| 132 | if (sharedVertsA[0] == 0 && sharedVertsA[1] == 2) |
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| 133 | { |
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| 134 | sharedVertsA[0] = 2; |
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| 135 | sharedVertsA[1] = 0; |
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| 136 | int tmp = sharedVertsB[1]; |
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| 137 | sharedVertsB[1] = sharedVertsB[0]; |
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| 138 | sharedVertsB[0] = tmp; |
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| 139 | } |
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| 140 | |
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| 141 | int hash = btGetHash(m_partIdA,m_triangleIndexA); |
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| 142 | |
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| 143 | btTriangleInfo* info = m_triangleInfoMap->find(hash); |
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| 144 | if (!info) |
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| 145 | { |
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| 146 | btTriangleInfo tmp; |
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| 147 | m_triangleInfoMap->insert(hash,tmp); |
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| 148 | info = m_triangleInfoMap->find(hash); |
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| 149 | } |
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| 150 | |
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| 151 | int sumvertsA = sharedVertsA[0]+sharedVertsA[1]; |
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| 152 | int otherIndexA = 3-sumvertsA; |
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| 153 | |
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| 154 | |
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| 155 | btVector3 edge(m_triangleVerticesA[sharedVertsA[1]]-m_triangleVerticesA[sharedVertsA[0]]); |
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| 156 | |
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| 157 | btTriangleShape tA(m_triangleVerticesA[0],m_triangleVerticesA[1],m_triangleVerticesA[2]); |
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| 158 | int otherIndexB = 3-(sharedVertsB[0]+sharedVertsB[1]); |
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| 159 | |
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| 160 | btTriangleShape tB(triangle[sharedVertsB[1]],triangle[sharedVertsB[0]],triangle[otherIndexB]); |
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| 161 | //btTriangleShape tB(triangle[0],triangle[1],triangle[2]); |
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| 162 | |
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| 163 | btVector3 normalA; |
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| 164 | btVector3 normalB; |
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| 165 | tA.calcNormal(normalA); |
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| 166 | tB.calcNormal(normalB); |
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| 167 | edge.normalize(); |
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| 168 | btVector3 edgeCrossA = edge.cross(normalA).normalize(); |
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| 169 | |
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| 170 | { |
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| 171 | btVector3 tmp = m_triangleVerticesA[otherIndexA]-m_triangleVerticesA[sharedVertsA[0]]; |
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| 172 | if (edgeCrossA.dot(tmp) < 0) |
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| 173 | { |
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| 174 | edgeCrossA*=-1; |
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| 175 | } |
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| 176 | } |
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| 177 | |
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| 178 | btVector3 edgeCrossB = edge.cross(normalB).normalize(); |
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| 179 | |
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| 180 | { |
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| 181 | btVector3 tmp = triangle[otherIndexB]-triangle[sharedVertsB[0]]; |
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| 182 | if (edgeCrossB.dot(tmp) < 0) |
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| 183 | { |
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| 184 | edgeCrossB*=-1; |
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| 185 | } |
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| 186 | } |
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| 187 | |
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| 188 | btScalar angle2 = 0; |
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| 189 | btScalar ang4 = 0.f; |
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| 190 | |
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| 191 | |
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| 192 | btVector3 calculatedEdge = edgeCrossA.cross(edgeCrossB); |
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| 193 | btScalar len2 = calculatedEdge.length2(); |
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| 194 | |
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| 195 | btScalar correctedAngle(0); |
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| 196 | btVector3 calculatedNormalB = normalA; |
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| 197 | bool isConvex = false; |
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| 198 | |
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| 199 | if (len2<m_triangleInfoMap->m_planarEpsilon) |
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| 200 | { |
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| 201 | angle2 = 0.f; |
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| 202 | ang4 = 0.f; |
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| 203 | } else |
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| 204 | { |
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| 205 | |
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| 206 | calculatedEdge.normalize(); |
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| 207 | btVector3 calculatedNormalA = calculatedEdge.cross(edgeCrossA); |
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| 208 | calculatedNormalA.normalize(); |
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| 209 | angle2 = btGetAngle(calculatedNormalA,edgeCrossA,edgeCrossB); |
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| 210 | ang4 = SIMD_PI-angle2; |
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| 211 | btScalar dotA = normalA.dot(edgeCrossB); |
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| 212 | ///@todo: check if we need some epsilon, due to floating point imprecision |
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| 213 | isConvex = (dotA<0.); |
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| 214 | |
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| 215 | correctedAngle = isConvex ? ang4 : -ang4; |
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| 216 | btQuaternion orn2(calculatedEdge,-correctedAngle); |
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| 217 | calculatedNormalB = btMatrix3x3(orn2)*normalA; |
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| 218 | |
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| 219 | |
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| 220 | } |
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| 221 | |
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| 222 | |
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| 223 | |
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| 224 | |
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| 225 | |
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| 226 | //alternatively use |
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| 227 | //btVector3 calculatedNormalB2 = quatRotate(orn,normalA); |
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| 228 | |
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| 229 | |
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| 230 | switch (sumvertsA) |
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| 231 | { |
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| 232 | case 1: |
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| 233 | { |
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| 234 | btVector3 edge = m_triangleVerticesA[0]-m_triangleVerticesA[1]; |
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| 235 | btQuaternion orn(edge,-correctedAngle); |
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| 236 | btVector3 computedNormalB = quatRotate(orn,normalA); |
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| 237 | btScalar bla = computedNormalB.dot(normalB); |
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| 238 | if (bla<0) |
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| 239 | { |
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| 240 | computedNormalB*=-1; |
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| 241 | info->m_flags |= TRI_INFO_V0V1_SWAP_NORMALB; |
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| 242 | } |
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| 243 | #ifdef DEBUG_INTERNAL_EDGE |
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| 244 | if ((computedNormalB-normalB).length()>0.0001) |
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| 245 | { |
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| 246 | printf("warning: normals not identical\n"); |
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| 247 | } |
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| 248 | #endif//DEBUG_INTERNAL_EDGE |
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| 249 | |
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| 250 | info->m_edgeV0V1Angle = -correctedAngle; |
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| 251 | |
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| 252 | if (isConvex) |
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| 253 | info->m_flags |= TRI_INFO_V0V1_CONVEX; |
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| 254 | break; |
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| 255 | } |
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| 256 | case 2: |
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| 257 | { |
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| 258 | btVector3 edge = m_triangleVerticesA[2]-m_triangleVerticesA[0]; |
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| 259 | btQuaternion orn(edge,-correctedAngle); |
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| 260 | btVector3 computedNormalB = quatRotate(orn,normalA); |
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| 261 | if (computedNormalB.dot(normalB)<0) |
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| 262 | { |
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| 263 | computedNormalB*=-1; |
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| 264 | info->m_flags |= TRI_INFO_V2V0_SWAP_NORMALB; |
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| 265 | } |
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| 266 | |
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| 267 | #ifdef DEBUG_INTERNAL_EDGE |
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| 268 | if ((computedNormalB-normalB).length()>0.0001) |
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| 269 | { |
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| 270 | printf("warning: normals not identical\n"); |
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| 271 | } |
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| 272 | #endif //DEBUG_INTERNAL_EDGE |
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| 273 | info->m_edgeV2V0Angle = -correctedAngle; |
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| 274 | if (isConvex) |
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| 275 | info->m_flags |= TRI_INFO_V2V0_CONVEX; |
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| 276 | break; |
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| 277 | } |
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| 278 | case 3: |
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| 279 | { |
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| 280 | btVector3 edge = m_triangleVerticesA[1]-m_triangleVerticesA[2]; |
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| 281 | btQuaternion orn(edge,-correctedAngle); |
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| 282 | btVector3 computedNormalB = quatRotate(orn,normalA); |
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| 283 | if (computedNormalB.dot(normalB)<0) |
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| 284 | { |
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| 285 | info->m_flags |= TRI_INFO_V1V2_SWAP_NORMALB; |
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| 286 | computedNormalB*=-1; |
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| 287 | } |
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| 288 | #ifdef DEBUG_INTERNAL_EDGE |
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| 289 | if ((computedNormalB-normalB).length()>0.0001) |
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| 290 | { |
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| 291 | printf("warning: normals not identical\n"); |
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| 292 | } |
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| 293 | #endif //DEBUG_INTERNAL_EDGE |
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| 294 | info->m_edgeV1V2Angle = -correctedAngle; |
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| 295 | |
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| 296 | if (isConvex) |
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| 297 | info->m_flags |= TRI_INFO_V1V2_CONVEX; |
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| 298 | break; |
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| 299 | } |
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| 300 | } |
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| 301 | |
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| 302 | break; |
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| 303 | } |
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| 304 | default: |
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| 305 | { |
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| 306 | // printf("warning: duplicate triangle\n"); |
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| 307 | } |
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| 308 | |
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| 309 | } |
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| 310 | } |
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| 311 | }; |
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| 312 | ///////////////////////////////////////////////////////// |
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| 313 | ///////////////////////////////////////////////////////// |
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| 314 | |
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| 315 | void btGenerateInternalEdgeInfo (btBvhTriangleMeshShape*trimeshShape, btTriangleInfoMap* triangleInfoMap) |
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| 316 | { |
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| 317 | //the user pointer shouldn't already be used for other purposes, we intend to store connectivity info there! |
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| 318 | if (trimeshShape->getTriangleInfoMap()) |
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| 319 | return; |
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| 320 | |
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| 321 | trimeshShape->setTriangleInfoMap(triangleInfoMap); |
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| 322 | |
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| 323 | btStridingMeshInterface* meshInterface = trimeshShape->getMeshInterface(); |
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| 324 | const btVector3& meshScaling = meshInterface->getScaling(); |
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| 325 | |
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| 326 | for (int partId = 0; partId< meshInterface->getNumSubParts();partId++) |
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| 327 | { |
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| 328 | const unsigned char *vertexbase = 0; |
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| 329 | int numverts = 0; |
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| 330 | PHY_ScalarType type = PHY_INTEGER; |
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| 331 | int stride = 0; |
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| 332 | const unsigned char *indexbase = 0; |
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| 333 | int indexstride = 0; |
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| 334 | int numfaces = 0; |
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| 335 | PHY_ScalarType indicestype = PHY_INTEGER; |
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| 336 | //PHY_ScalarType indexType=0; |
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| 337 | |
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| 338 | btVector3 triangleVerts[3]; |
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| 339 | meshInterface->getLockedReadOnlyVertexIndexBase(&vertexbase,numverts, type,stride,&indexbase,indexstride,numfaces,indicestype,partId); |
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| 340 | btVector3 aabbMin,aabbMax; |
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| 341 | |
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| 342 | for (int triangleIndex = 0 ; triangleIndex < numfaces;triangleIndex++) |
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| 343 | { |
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| 344 | unsigned int* gfxbase = (unsigned int*)(indexbase+triangleIndex*indexstride); |
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| 345 | |
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| 346 | for (int j=2;j>=0;j--) |
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| 347 | { |
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| 348 | |
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| 349 | int graphicsindex = indicestype==PHY_SHORT?((unsigned short*)gfxbase)[j]:gfxbase[j]; |
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| 350 | if (type == PHY_FLOAT) |
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| 351 | { |
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| 352 | float* graphicsbase = (float*)(vertexbase+graphicsindex*stride); |
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| 353 | triangleVerts[j] = btVector3( |
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| 354 | graphicsbase[0]*meshScaling.getX(), |
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| 355 | graphicsbase[1]*meshScaling.getY(), |
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| 356 | graphicsbase[2]*meshScaling.getZ()); |
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| 357 | } |
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| 358 | else |
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| 359 | { |
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| 360 | double* graphicsbase = (double*)(vertexbase+graphicsindex*stride); |
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| 361 | triangleVerts[j] = btVector3( btScalar(graphicsbase[0]*meshScaling.getX()), btScalar(graphicsbase[1]*meshScaling.getY()), btScalar(graphicsbase[2]*meshScaling.getZ())); |
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| 362 | } |
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| 363 | } |
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| 364 | aabbMin.setValue(btScalar(BT_LARGE_FLOAT),btScalar(BT_LARGE_FLOAT),btScalar(BT_LARGE_FLOAT)); |
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| 365 | aabbMax.setValue(btScalar(-BT_LARGE_FLOAT),btScalar(-BT_LARGE_FLOAT),btScalar(-BT_LARGE_FLOAT)); |
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| 366 | aabbMin.setMin(triangleVerts[0]); |
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| 367 | aabbMax.setMax(triangleVerts[0]); |
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| 368 | aabbMin.setMin(triangleVerts[1]); |
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| 369 | aabbMax.setMax(triangleVerts[1]); |
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| 370 | aabbMin.setMin(triangleVerts[2]); |
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| 371 | aabbMax.setMax(triangleVerts[2]); |
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| 372 | |
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| 373 | btConnectivityProcessor connectivityProcessor; |
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| 374 | connectivityProcessor.m_partIdA = partId; |
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| 375 | connectivityProcessor.m_triangleIndexA = triangleIndex; |
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| 376 | connectivityProcessor.m_triangleVerticesA = &triangleVerts[0]; |
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| 377 | connectivityProcessor.m_triangleInfoMap = triangleInfoMap; |
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| 378 | |
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| 379 | trimeshShape->processAllTriangles(&connectivityProcessor,aabbMin,aabbMax); |
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| 380 | } |
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| 381 | |
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| 382 | } |
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| 383 | |
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| 384 | } |
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| 385 | |
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| 386 | |
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| 387 | |
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| 388 | |
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| 389 | // Given a point and a line segment (defined by two points), compute the closest point |
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| 390 | // in the line. Cap the point at the endpoints of the line segment. |
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| 391 | void btNearestPointInLineSegment(const btVector3 &point, const btVector3& line0, const btVector3& line1, btVector3& nearestPoint) |
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| 392 | { |
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| 393 | btVector3 lineDelta = line1 - line0; |
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| 394 | |
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| 395 | // Handle degenerate lines |
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| 396 | if ( lineDelta.fuzzyZero()) |
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| 397 | { |
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| 398 | nearestPoint = line0; |
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| 399 | } |
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| 400 | else |
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| 401 | { |
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| 402 | btScalar delta = (point-line0).dot(lineDelta) / (lineDelta).dot(lineDelta); |
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| 403 | |
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| 404 | // Clamp the point to conform to the segment's endpoints |
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| 405 | if ( delta < 0 ) |
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| 406 | delta = 0; |
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| 407 | else if ( delta > 1 ) |
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| 408 | delta = 1; |
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| 409 | |
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| 410 | nearestPoint = line0 + lineDelta*delta; |
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| 411 | } |
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| 412 | } |
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| 413 | |
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| 414 | |
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| 415 | |
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| 416 | |
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| 417 | bool btClampNormal(const btVector3& edge,const btVector3& tri_normal_org,const btVector3& localContactNormalOnB, btScalar correctedEdgeAngle, btVector3 & clampedLocalNormal) |
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| 418 | { |
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| 419 | btVector3 tri_normal = tri_normal_org; |
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| 420 | //we only have a local triangle normal, not a local contact normal -> only normal in world space... |
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| 421 | //either compute the current angle all in local space, or all in world space |
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| 422 | |
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| 423 | btVector3 edgeCross = edge.cross(tri_normal).normalize(); |
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| 424 | btScalar curAngle = btGetAngle(edgeCross,tri_normal,localContactNormalOnB); |
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| 425 | |
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| 426 | if (correctedEdgeAngle<0) |
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| 427 | { |
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| 428 | if (curAngle < correctedEdgeAngle) |
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| 429 | { |
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| 430 | btScalar diffAngle = correctedEdgeAngle-curAngle; |
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| 431 | btQuaternion rotation(edge,diffAngle ); |
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| 432 | clampedLocalNormal = btMatrix3x3(rotation)*localContactNormalOnB; |
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| 433 | return true; |
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| 434 | } |
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| 435 | } |
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| 436 | |
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| 437 | if (correctedEdgeAngle>=0) |
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| 438 | { |
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| 439 | if (curAngle > correctedEdgeAngle) |
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| 440 | { |
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| 441 | btScalar diffAngle = correctedEdgeAngle-curAngle; |
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| 442 | btQuaternion rotation(edge,diffAngle ); |
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| 443 | clampedLocalNormal = btMatrix3x3(rotation)*localContactNormalOnB; |
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| 444 | return true; |
|---|
| 445 | } |
|---|
| 446 | } |
|---|
| 447 | return false; |
|---|
| 448 | } |
|---|
| 449 | |
|---|
| 450 | |
|---|
| 451 | |
|---|
| 452 | /// Changes a btManifoldPoint collision normal to the normal from the mesh. |
|---|
| 453 | void btAdjustInternalEdgeContacts(btManifoldPoint& cp, const btCollisionObject* colObj0,const btCollisionObject* colObj1, int partId0, int index0, int normalAdjustFlags) |
|---|
| 454 | { |
|---|
| 455 | //btAssert(colObj0->getCollisionShape()->getShapeType() == TRIANGLE_SHAPE_PROXYTYPE); |
|---|
| 456 | if (colObj0->getCollisionShape()->getShapeType() != TRIANGLE_SHAPE_PROXYTYPE) |
|---|
| 457 | return; |
|---|
| 458 | |
|---|
| 459 | btBvhTriangleMeshShape* trimesh = (btBvhTriangleMeshShape*)colObj0->getRootCollisionShape(); |
|---|
| 460 | btTriangleInfoMap* triangleInfoMapPtr = (btTriangleInfoMap*) trimesh->getTriangleInfoMap(); |
|---|
| 461 | if (!triangleInfoMapPtr) |
|---|
| 462 | return; |
|---|
| 463 | |
|---|
| 464 | int hash = btGetHash(partId0,index0); |
|---|
| 465 | |
|---|
| 466 | |
|---|
| 467 | btTriangleInfo* info = triangleInfoMapPtr->find(hash); |
|---|
| 468 | if (!info) |
|---|
| 469 | return; |
|---|
| 470 | |
|---|
| 471 | btScalar frontFacing = (normalAdjustFlags & BT_TRIANGLE_CONVEX_BACKFACE_MODE)==0? 1.f : -1.f; |
|---|
| 472 | |
|---|
| 473 | const btTriangleShape* tri_shape = static_cast<const btTriangleShape*>(colObj0->getCollisionShape()); |
|---|
| 474 | btVector3 v0,v1,v2; |
|---|
| 475 | tri_shape->getVertex(0,v0); |
|---|
| 476 | tri_shape->getVertex(1,v1); |
|---|
| 477 | tri_shape->getVertex(2,v2); |
|---|
| 478 | |
|---|
| 479 | btVector3 center = (v0+v1+v2)*btScalar(1./3.); |
|---|
| 480 | |
|---|
| 481 | btVector3 red(1,0,0), green(0,1,0),blue(0,0,1),white(1,1,1),black(0,0,0); |
|---|
| 482 | btVector3 tri_normal; |
|---|
| 483 | tri_shape->calcNormal(tri_normal); |
|---|
| 484 | |
|---|
| 485 | //btScalar dot = tri_normal.dot(cp.m_normalWorldOnB); |
|---|
| 486 | btVector3 nearest; |
|---|
| 487 | btNearestPointInLineSegment(cp.m_localPointB,v0,v1,nearest); |
|---|
| 488 | |
|---|
| 489 | btVector3 contact = cp.m_localPointB; |
|---|
| 490 | #ifdef BT_INTERNAL_EDGE_DEBUG_DRAW |
|---|
| 491 | const btTransform& tr = colObj0->getWorldTransform(); |
|---|
| 492 | btDebugDrawLine(tr*nearest,tr*cp.m_localPointB,red); |
|---|
| 493 | #endif //BT_INTERNAL_EDGE_DEBUG_DRAW |
|---|
| 494 | |
|---|
| 495 | |
|---|
| 496 | |
|---|
| 497 | bool isNearEdge = false; |
|---|
| 498 | |
|---|
| 499 | int numConcaveEdgeHits = 0; |
|---|
| 500 | int numConvexEdgeHits = 0; |
|---|
| 501 | |
|---|
| 502 | btVector3 localContactNormalOnB = colObj0->getWorldTransform().getBasis().transpose() * cp.m_normalWorldOnB; |
|---|
| 503 | localContactNormalOnB.normalize();//is this necessary? |
|---|
| 504 | |
|---|
| 505 | if ((info->m_edgeV0V1Angle)< SIMD_2_PI) |
|---|
| 506 | { |
|---|
| 507 | #ifdef BT_INTERNAL_EDGE_DEBUG_DRAW |
|---|
| 508 | btDebugDrawLine(tr*contact,tr*(contact+cp.m_normalWorldOnB*10),black); |
|---|
| 509 | #endif |
|---|
| 510 | btScalar len = (contact-nearest).length(); |
|---|
| 511 | if(len<triangleInfoMapPtr->m_edgeDistanceThreshold) |
|---|
| 512 | { |
|---|
| 513 | btVector3 edge(v0-v1); |
|---|
| 514 | isNearEdge = true; |
|---|
| 515 | |
|---|
| 516 | if (info->m_edgeV0V1Angle==btScalar(0)) |
|---|
| 517 | { |
|---|
| 518 | numConcaveEdgeHits++; |
|---|
| 519 | } else |
|---|
| 520 | { |
|---|
| 521 | |
|---|
| 522 | bool isEdgeConvex = (info->m_flags & TRI_INFO_V0V1_CONVEX); |
|---|
| 523 | btScalar swapFactor = isEdgeConvex ? btScalar(1) : btScalar(-1); |
|---|
| 524 | #ifdef BT_INTERNAL_EDGE_DEBUG_DRAW |
|---|
| 525 | btDebugDrawLine(tr*nearest,tr*(nearest+swapFactor*tri_normal*10),white); |
|---|
| 526 | #endif //BT_INTERNAL_EDGE_DEBUG_DRAW |
|---|
| 527 | |
|---|
| 528 | btVector3 nA = swapFactor * tri_normal; |
|---|
| 529 | |
|---|
| 530 | btQuaternion orn(edge,info->m_edgeV0V1Angle); |
|---|
| 531 | btVector3 computedNormalB = quatRotate(orn,tri_normal); |
|---|
| 532 | if (info->m_flags & TRI_INFO_V0V1_SWAP_NORMALB) |
|---|
| 533 | computedNormalB*=-1; |
|---|
| 534 | btVector3 nB = swapFactor*computedNormalB; |
|---|
| 535 | |
|---|
| 536 | btScalar NdotA = localContactNormalOnB.dot(nA); |
|---|
| 537 | btScalar NdotB = localContactNormalOnB.dot(nB); |
|---|
| 538 | bool backFacingNormal = (NdotA< triangleInfoMapPtr->m_convexEpsilon) && (NdotB<triangleInfoMapPtr->m_convexEpsilon); |
|---|
| 539 | |
|---|
| 540 | #ifdef DEBUG_INTERNAL_EDGE |
|---|
| 541 | { |
|---|
| 542 | |
|---|
| 543 | btDebugDrawLine(cp.getPositionWorldOnB(),cp.getPositionWorldOnB()+tr.getBasis()*(nB*20),red); |
|---|
| 544 | } |
|---|
| 545 | #endif //DEBUG_INTERNAL_EDGE |
|---|
| 546 | |
|---|
| 547 | |
|---|
| 548 | if (backFacingNormal) |
|---|
| 549 | { |
|---|
| 550 | numConcaveEdgeHits++; |
|---|
| 551 | } |
|---|
| 552 | else |
|---|
| 553 | { |
|---|
| 554 | numConvexEdgeHits++; |
|---|
| 555 | btVector3 clampedLocalNormal; |
|---|
| 556 | bool isClamped = btClampNormal(edge,swapFactor*tri_normal,localContactNormalOnB, info->m_edgeV0V1Angle,clampedLocalNormal); |
|---|
| 557 | if (isClamped) |
|---|
| 558 | { |
|---|
| 559 | if (((normalAdjustFlags & BT_TRIANGLE_CONVEX_DOUBLE_SIDED)!=0) || (clampedLocalNormal.dot(frontFacing*tri_normal)>0)) |
|---|
| 560 | { |
|---|
| 561 | btVector3 newNormal = colObj0->getWorldTransform().getBasis() * clampedLocalNormal; |
|---|
| 562 | // cp.m_distance1 = cp.m_distance1 * newNormal.dot(cp.m_normalWorldOnB); |
|---|
| 563 | cp.m_normalWorldOnB = newNormal; |
|---|
| 564 | // Reproject collision point along normal. (what about cp.m_distance1?) |
|---|
| 565 | cp.m_positionWorldOnB = cp.m_positionWorldOnA - cp.m_normalWorldOnB * cp.m_distance1; |
|---|
| 566 | cp.m_localPointB = colObj0->getWorldTransform().invXform(cp.m_positionWorldOnB); |
|---|
| 567 | |
|---|
| 568 | } |
|---|
| 569 | } |
|---|
| 570 | } |
|---|
| 571 | } |
|---|
| 572 | } |
|---|
| 573 | } |
|---|
| 574 | |
|---|
| 575 | btNearestPointInLineSegment(contact,v1,v2,nearest); |
|---|
| 576 | #ifdef BT_INTERNAL_EDGE_DEBUG_DRAW |
|---|
| 577 | btDebugDrawLine(tr*nearest,tr*cp.m_localPointB,green); |
|---|
| 578 | #endif //BT_INTERNAL_EDGE_DEBUG_DRAW |
|---|
| 579 | |
|---|
| 580 | if ((info->m_edgeV1V2Angle)< SIMD_2_PI) |
|---|
| 581 | { |
|---|
| 582 | #ifdef BT_INTERNAL_EDGE_DEBUG_DRAW |
|---|
| 583 | btDebugDrawLine(tr*contact,tr*(contact+cp.m_normalWorldOnB*10),black); |
|---|
| 584 | #endif //BT_INTERNAL_EDGE_DEBUG_DRAW |
|---|
| 585 | |
|---|
| 586 | |
|---|
| 587 | |
|---|
| 588 | btScalar len = (contact-nearest).length(); |
|---|
| 589 | if(len<triangleInfoMapPtr->m_edgeDistanceThreshold) |
|---|
| 590 | { |
|---|
| 591 | isNearEdge = true; |
|---|
| 592 | #ifdef BT_INTERNAL_EDGE_DEBUG_DRAW |
|---|
| 593 | btDebugDrawLine(tr*nearest,tr*(nearest+tri_normal*10),white); |
|---|
| 594 | #endif //BT_INTERNAL_EDGE_DEBUG_DRAW |
|---|
| 595 | |
|---|
| 596 | btVector3 edge(v1-v2); |
|---|
| 597 | |
|---|
| 598 | isNearEdge = true; |
|---|
| 599 | |
|---|
| 600 | if (info->m_edgeV1V2Angle == btScalar(0)) |
|---|
| 601 | { |
|---|
| 602 | numConcaveEdgeHits++; |
|---|
| 603 | } else |
|---|
| 604 | { |
|---|
| 605 | bool isEdgeConvex = (info->m_flags & TRI_INFO_V1V2_CONVEX)!=0; |
|---|
| 606 | btScalar swapFactor = isEdgeConvex ? btScalar(1) : btScalar(-1); |
|---|
| 607 | #ifdef BT_INTERNAL_EDGE_DEBUG_DRAW |
|---|
| 608 | btDebugDrawLine(tr*nearest,tr*(nearest+swapFactor*tri_normal*10),white); |
|---|
| 609 | #endif //BT_INTERNAL_EDGE_DEBUG_DRAW |
|---|
| 610 | |
|---|
| 611 | btVector3 nA = swapFactor * tri_normal; |
|---|
| 612 | |
|---|
| 613 | btQuaternion orn(edge,info->m_edgeV1V2Angle); |
|---|
| 614 | btVector3 computedNormalB = quatRotate(orn,tri_normal); |
|---|
| 615 | if (info->m_flags & TRI_INFO_V1V2_SWAP_NORMALB) |
|---|
| 616 | computedNormalB*=-1; |
|---|
| 617 | btVector3 nB = swapFactor*computedNormalB; |
|---|
| 618 | |
|---|
| 619 | #ifdef DEBUG_INTERNAL_EDGE |
|---|
| 620 | { |
|---|
| 621 | btDebugDrawLine(cp.getPositionWorldOnB(),cp.getPositionWorldOnB()+tr.getBasis()*(nB*20),red); |
|---|
| 622 | } |
|---|
| 623 | #endif //DEBUG_INTERNAL_EDGE |
|---|
| 624 | |
|---|
| 625 | |
|---|
| 626 | btScalar NdotA = localContactNormalOnB.dot(nA); |
|---|
| 627 | btScalar NdotB = localContactNormalOnB.dot(nB); |
|---|
| 628 | bool backFacingNormal = (NdotA< triangleInfoMapPtr->m_convexEpsilon) && (NdotB<triangleInfoMapPtr->m_convexEpsilon); |
|---|
| 629 | |
|---|
| 630 | if (backFacingNormal) |
|---|
| 631 | { |
|---|
| 632 | numConcaveEdgeHits++; |
|---|
| 633 | } |
|---|
| 634 | else |
|---|
| 635 | { |
|---|
| 636 | numConvexEdgeHits++; |
|---|
| 637 | btVector3 localContactNormalOnB = colObj0->getWorldTransform().getBasis().transpose() * cp.m_normalWorldOnB; |
|---|
| 638 | btVector3 clampedLocalNormal; |
|---|
| 639 | bool isClamped = btClampNormal(edge,swapFactor*tri_normal,localContactNormalOnB, info->m_edgeV1V2Angle,clampedLocalNormal); |
|---|
| 640 | if (isClamped) |
|---|
| 641 | { |
|---|
| 642 | if (((normalAdjustFlags & BT_TRIANGLE_CONVEX_DOUBLE_SIDED)!=0) || (clampedLocalNormal.dot(frontFacing*tri_normal)>0)) |
|---|
| 643 | { |
|---|
| 644 | btVector3 newNormal = colObj0->getWorldTransform().getBasis() * clampedLocalNormal; |
|---|
| 645 | // cp.m_distance1 = cp.m_distance1 * newNormal.dot(cp.m_normalWorldOnB); |
|---|
| 646 | cp.m_normalWorldOnB = newNormal; |
|---|
| 647 | // Reproject collision point along normal. |
|---|
| 648 | cp.m_positionWorldOnB = cp.m_positionWorldOnA - cp.m_normalWorldOnB * cp.m_distance1; |
|---|
| 649 | cp.m_localPointB = colObj0->getWorldTransform().invXform(cp.m_positionWorldOnB); |
|---|
| 650 | } |
|---|
| 651 | } |
|---|
| 652 | } |
|---|
| 653 | } |
|---|
| 654 | } |
|---|
| 655 | } |
|---|
| 656 | |
|---|
| 657 | btNearestPointInLineSegment(contact,v2,v0,nearest); |
|---|
| 658 | #ifdef BT_INTERNAL_EDGE_DEBUG_DRAW |
|---|
| 659 | btDebugDrawLine(tr*nearest,tr*cp.m_localPointB,blue); |
|---|
| 660 | #endif //BT_INTERNAL_EDGE_DEBUG_DRAW |
|---|
| 661 | |
|---|
| 662 | if ((info->m_edgeV2V0Angle)< SIMD_2_PI) |
|---|
| 663 | { |
|---|
| 664 | |
|---|
| 665 | #ifdef BT_INTERNAL_EDGE_DEBUG_DRAW |
|---|
| 666 | btDebugDrawLine(tr*contact,tr*(contact+cp.m_normalWorldOnB*10),black); |
|---|
| 667 | #endif //BT_INTERNAL_EDGE_DEBUG_DRAW |
|---|
| 668 | |
|---|
| 669 | btScalar len = (contact-nearest).length(); |
|---|
| 670 | if(len<triangleInfoMapPtr->m_edgeDistanceThreshold) |
|---|
| 671 | { |
|---|
| 672 | isNearEdge = true; |
|---|
| 673 | #ifdef BT_INTERNAL_EDGE_DEBUG_DRAW |
|---|
| 674 | btDebugDrawLine(tr*nearest,tr*(nearest+tri_normal*10),white); |
|---|
| 675 | #endif //BT_INTERNAL_EDGE_DEBUG_DRAW |
|---|
| 676 | |
|---|
| 677 | btVector3 edge(v2-v0); |
|---|
| 678 | |
|---|
| 679 | if (info->m_edgeV2V0Angle==btScalar(0)) |
|---|
| 680 | { |
|---|
| 681 | numConcaveEdgeHits++; |
|---|
| 682 | } else |
|---|
| 683 | { |
|---|
| 684 | |
|---|
| 685 | bool isEdgeConvex = (info->m_flags & TRI_INFO_V2V0_CONVEX)!=0; |
|---|
| 686 | btScalar swapFactor = isEdgeConvex ? btScalar(1) : btScalar(-1); |
|---|
| 687 | #ifdef BT_INTERNAL_EDGE_DEBUG_DRAW |
|---|
| 688 | btDebugDrawLine(tr*nearest,tr*(nearest+swapFactor*tri_normal*10),white); |
|---|
| 689 | #endif //BT_INTERNAL_EDGE_DEBUG_DRAW |
|---|
| 690 | |
|---|
| 691 | btVector3 nA = swapFactor * tri_normal; |
|---|
| 692 | btQuaternion orn(edge,info->m_edgeV2V0Angle); |
|---|
| 693 | btVector3 computedNormalB = quatRotate(orn,tri_normal); |
|---|
| 694 | if (info->m_flags & TRI_INFO_V2V0_SWAP_NORMALB) |
|---|
| 695 | computedNormalB*=-1; |
|---|
| 696 | btVector3 nB = swapFactor*computedNormalB; |
|---|
| 697 | |
|---|
| 698 | #ifdef DEBUG_INTERNAL_EDGE |
|---|
| 699 | { |
|---|
| 700 | btDebugDrawLine(cp.getPositionWorldOnB(),cp.getPositionWorldOnB()+tr.getBasis()*(nB*20),red); |
|---|
| 701 | } |
|---|
| 702 | #endif //DEBUG_INTERNAL_EDGE |
|---|
| 703 | |
|---|
| 704 | btScalar NdotA = localContactNormalOnB.dot(nA); |
|---|
| 705 | btScalar NdotB = localContactNormalOnB.dot(nB); |
|---|
| 706 | bool backFacingNormal = (NdotA< triangleInfoMapPtr->m_convexEpsilon) && (NdotB<triangleInfoMapPtr->m_convexEpsilon); |
|---|
| 707 | |
|---|
| 708 | if (backFacingNormal) |
|---|
| 709 | { |
|---|
| 710 | numConcaveEdgeHits++; |
|---|
| 711 | } |
|---|
| 712 | else |
|---|
| 713 | { |
|---|
| 714 | numConvexEdgeHits++; |
|---|
| 715 | // printf("hitting convex edge\n"); |
|---|
| 716 | |
|---|
| 717 | |
|---|
| 718 | btVector3 localContactNormalOnB = colObj0->getWorldTransform().getBasis().transpose() * cp.m_normalWorldOnB; |
|---|
| 719 | btVector3 clampedLocalNormal; |
|---|
| 720 | bool isClamped = btClampNormal(edge,swapFactor*tri_normal,localContactNormalOnB,info->m_edgeV2V0Angle,clampedLocalNormal); |
|---|
| 721 | if (isClamped) |
|---|
| 722 | { |
|---|
| 723 | if (((normalAdjustFlags & BT_TRIANGLE_CONVEX_DOUBLE_SIDED)!=0) || (clampedLocalNormal.dot(frontFacing*tri_normal)>0)) |
|---|
| 724 | { |
|---|
| 725 | btVector3 newNormal = colObj0->getWorldTransform().getBasis() * clampedLocalNormal; |
|---|
| 726 | // cp.m_distance1 = cp.m_distance1 * newNormal.dot(cp.m_normalWorldOnB); |
|---|
| 727 | cp.m_normalWorldOnB = newNormal; |
|---|
| 728 | // Reproject collision point along normal. |
|---|
| 729 | cp.m_positionWorldOnB = cp.m_positionWorldOnA - cp.m_normalWorldOnB * cp.m_distance1; |
|---|
| 730 | cp.m_localPointB = colObj0->getWorldTransform().invXform(cp.m_positionWorldOnB); |
|---|
| 731 | } |
|---|
| 732 | } |
|---|
| 733 | } |
|---|
| 734 | } |
|---|
| 735 | |
|---|
| 736 | |
|---|
| 737 | } |
|---|
| 738 | } |
|---|
| 739 | |
|---|
| 740 | #ifdef DEBUG_INTERNAL_EDGE |
|---|
| 741 | { |
|---|
| 742 | btVector3 color(0,1,1); |
|---|
| 743 | btDebugDrawLine(cp.getPositionWorldOnB(),cp.getPositionWorldOnB()+cp.m_normalWorldOnB*10,color); |
|---|
| 744 | } |
|---|
| 745 | #endif //DEBUG_INTERNAL_EDGE |
|---|
| 746 | |
|---|
| 747 | if (isNearEdge) |
|---|
| 748 | { |
|---|
| 749 | |
|---|
| 750 | if (numConcaveEdgeHits>0) |
|---|
| 751 | { |
|---|
| 752 | if ((normalAdjustFlags & BT_TRIANGLE_CONCAVE_DOUBLE_SIDED)!=0) |
|---|
| 753 | { |
|---|
| 754 | //fix tri_normal so it pointing the same direction as the current local contact normal |
|---|
| 755 | if (tri_normal.dot(localContactNormalOnB) < 0) |
|---|
| 756 | { |
|---|
| 757 | tri_normal *= -1; |
|---|
| 758 | } |
|---|
| 759 | cp.m_normalWorldOnB = colObj0->getWorldTransform().getBasis()*tri_normal; |
|---|
| 760 | } else |
|---|
| 761 | { |
|---|
| 762 | //modify the normal to be the triangle normal (or backfacing normal) |
|---|
| 763 | cp.m_normalWorldOnB = colObj0->getWorldTransform().getBasis() *(tri_normal *frontFacing); |
|---|
| 764 | } |
|---|
| 765 | |
|---|
| 766 | |
|---|
| 767 | // Reproject collision point along normal. |
|---|
| 768 | cp.m_positionWorldOnB = cp.m_positionWorldOnA - cp.m_normalWorldOnB * cp.m_distance1; |
|---|
| 769 | cp.m_localPointB = colObj0->getWorldTransform().invXform(cp.m_positionWorldOnB); |
|---|
| 770 | } |
|---|
| 771 | } |
|---|
| 772 | } |
|---|