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Diffstat (limited to 'thirdparty/bullet/Bullet3Collision/NarrowPhaseCollision/shared/b3ContactConvexConvexSAT.h')
| -rw-r--r-- | thirdparty/bullet/Bullet3Collision/NarrowPhaseCollision/shared/b3ContactConvexConvexSAT.h | 520 |
1 files changed, 520 insertions, 0 deletions
diff --git a/thirdparty/bullet/Bullet3Collision/NarrowPhaseCollision/shared/b3ContactConvexConvexSAT.h b/thirdparty/bullet/Bullet3Collision/NarrowPhaseCollision/shared/b3ContactConvexConvexSAT.h new file mode 100644 index 0000000000..f295f01a6c --- /dev/null +++ b/thirdparty/bullet/Bullet3Collision/NarrowPhaseCollision/shared/b3ContactConvexConvexSAT.h @@ -0,0 +1,520 @@ + +#ifndef B3_CONTACT_CONVEX_CONVEX_SAT_H +#define B3_CONTACT_CONVEX_CONVEX_SAT_H + + +#include "Bullet3Collision/NarrowPhaseCollision/shared/b3Contact4Data.h" +#include "Bullet3Collision/NarrowPhaseCollision/shared/b3FindSeparatingAxis.h" +#include "Bullet3Collision/NarrowPhaseCollision/shared/b3ReduceContacts.h" + +#define B3_MAX_VERTS 1024 + + + +inline b3Float4 b3Lerp3(const b3Float4& a,const b3Float4& b, float t) +{ + return b3MakeVector3( a.x + (b.x - a.x) * t, + a.y + (b.y - a.y) * t, + a.z + (b.z - a.z) * t, + 0.f); +} + + +// Clips a face to the back of a plane, return the number of vertices out, stored in ppVtxOut +inline int b3ClipFace(const b3Float4* pVtxIn, int numVertsIn, b3Float4& planeNormalWS,float planeEqWS, b3Float4* ppVtxOut) +{ + + int ve; + float ds, de; + int numVertsOut = 0; + if (numVertsIn < 2) + return 0; + + b3Float4 firstVertex=pVtxIn[numVertsIn-1]; + b3Float4 endVertex = pVtxIn[0]; + + ds = b3Dot3F4(planeNormalWS,firstVertex)+planeEqWS; + + for (ve = 0; ve < numVertsIn; ve++) + { + endVertex=pVtxIn[ve]; + + de = b3Dot3F4(planeNormalWS,endVertex)+planeEqWS; + + if (ds<0) + { + if (de<0) + { + // Start < 0, end < 0, so output endVertex + ppVtxOut[numVertsOut++] = endVertex; + } + else + { + // Start < 0, end >= 0, so output intersection + ppVtxOut[numVertsOut++] = b3Lerp3(firstVertex, endVertex,(ds * 1.f/(ds - de)) ); + } + } + else + { + if (de<0) + { + // Start >= 0, end < 0 so output intersection and end + ppVtxOut[numVertsOut++] = b3Lerp3(firstVertex, endVertex,(ds * 1.f/(ds - de)) ); + ppVtxOut[numVertsOut++] = endVertex; + } + } + firstVertex = endVertex; + ds = de; + } + return numVertsOut; +} + + +inline int b3ClipFaceAgainstHull(const b3Float4& separatingNormal, const b3ConvexPolyhedronData* hullA, + const b3Float4& posA, const b3Quaternion& ornA, b3Float4* worldVertsB1, int numWorldVertsB1, + b3Float4* worldVertsB2, int capacityWorldVertsB2, + const float minDist, float maxDist, + const b3AlignedObjectArray<b3Float4>& verticesA, const b3AlignedObjectArray<b3GpuFace>& facesA, const b3AlignedObjectArray<int>& indicesA, + //const b3Float4* verticesB, const b3GpuFace* facesB, const int* indicesB, + b3Float4* contactsOut, + int contactCapacity) +{ + int numContactsOut = 0; + + b3Float4* pVtxIn = worldVertsB1; + b3Float4* pVtxOut = worldVertsB2; + + int numVertsIn = numWorldVertsB1; + int numVertsOut = 0; + + int closestFaceA=-1; + { + float dmin = FLT_MAX; + for(int face=0;face<hullA->m_numFaces;face++) + { + const b3Float4 Normal = b3MakeVector3( + facesA[hullA->m_faceOffset+face].m_plane.x, + facesA[hullA->m_faceOffset+face].m_plane.y, + facesA[hullA->m_faceOffset+face].m_plane.z,0.f); + const b3Float4 faceANormalWS = b3QuatRotate(ornA,Normal); + + float d = b3Dot3F4(faceANormalWS,separatingNormal); + if (d < dmin) + { + dmin = d; + closestFaceA = face; + } + } + } + if (closestFaceA<0) + return numContactsOut; + + b3GpuFace polyA = facesA[hullA->m_faceOffset+closestFaceA]; + + // clip polygon to back of planes of all faces of hull A that are adjacent to witness face + //int numContacts = numWorldVertsB1; + int numVerticesA = polyA.m_numIndices; + for(int e0=0;e0<numVerticesA;e0++) + { + const b3Float4 a = verticesA[hullA->m_vertexOffset+indicesA[polyA.m_indexOffset+e0]]; + const b3Float4 b = verticesA[hullA->m_vertexOffset+indicesA[polyA.m_indexOffset+((e0+1)%numVerticesA)]]; + const b3Float4 edge0 = a - b; + const b3Float4 WorldEdge0 = b3QuatRotate(ornA,edge0); + b3Float4 planeNormalA = b3MakeFloat4(polyA.m_plane.x,polyA.m_plane.y,polyA.m_plane.z,0.f); + b3Float4 worldPlaneAnormal1 = b3QuatRotate(ornA,planeNormalA); + + b3Float4 planeNormalWS1 = -b3Cross3(WorldEdge0,worldPlaneAnormal1); + b3Float4 worldA1 = b3TransformPoint(a,posA,ornA); + float planeEqWS1 = -b3Dot3F4(worldA1,planeNormalWS1); + + b3Float4 planeNormalWS = planeNormalWS1; + float planeEqWS=planeEqWS1; + + //clip face + //clipFace(*pVtxIn, *pVtxOut,planeNormalWS,planeEqWS); + numVertsOut = b3ClipFace(pVtxIn, numVertsIn, planeNormalWS,planeEqWS, pVtxOut); + + //btSwap(pVtxIn,pVtxOut); + b3Float4* tmp = pVtxOut; + pVtxOut = pVtxIn; + pVtxIn = tmp; + numVertsIn = numVertsOut; + numVertsOut = 0; + } + + + // only keep points that are behind the witness face + { + b3Float4 localPlaneNormal = b3MakeFloat4(polyA.m_plane.x,polyA.m_plane.y,polyA.m_plane.z,0.f); + float localPlaneEq = polyA.m_plane.w; + b3Float4 planeNormalWS = b3QuatRotate(ornA,localPlaneNormal); + float planeEqWS=localPlaneEq-b3Dot3F4(planeNormalWS,posA); + for (int i=0;i<numVertsIn;i++) + { + float depth = b3Dot3F4(planeNormalWS,pVtxIn[i])+planeEqWS; + if (depth <=minDist) + { + depth = minDist; + } + if (numContactsOut<contactCapacity) + { + if (depth <=maxDist) + { + b3Float4 pointInWorld = pVtxIn[i]; + //resultOut.addContactPoint(separatingNormal,point,depth); + contactsOut[numContactsOut++] = b3MakeVector3(pointInWorld.x,pointInWorld.y,pointInWorld.z,depth); + //printf("depth=%f\n",depth); + } + } else + { + b3Error("exceeding contact capacity (%d,%df)\n", numContactsOut,contactCapacity); + } + } + } + + return numContactsOut; +} + + + +inline int b3ClipHullAgainstHull(const b3Float4& separatingNormal, + const b3ConvexPolyhedronData& hullA, const b3ConvexPolyhedronData& hullB, + const b3Float4& posA, const b3Quaternion& ornA,const b3Float4& posB, const b3Quaternion& ornB, + b3Float4* worldVertsB1, b3Float4* worldVertsB2, int capacityWorldVerts, + const float minDist, float maxDist, + const b3AlignedObjectArray<b3Float4>& verticesA, const b3AlignedObjectArray<b3GpuFace>& facesA, const b3AlignedObjectArray<int>& indicesA, + const b3AlignedObjectArray<b3Float4>& verticesB, const b3AlignedObjectArray<b3GpuFace>& facesB, const b3AlignedObjectArray<int>& indicesB, + + b3Float4* contactsOut, + int contactCapacity) +{ + int numContactsOut = 0; + int numWorldVertsB1= 0; + + B3_PROFILE("clipHullAgainstHull"); + + //float curMaxDist=maxDist; + int closestFaceB=-1; + float dmax = -FLT_MAX; + + { + //B3_PROFILE("closestFaceB"); + if (hullB.m_numFaces!=1) + { + //printf("wtf\n"); + } + static bool once = true; + //printf("separatingNormal=%f,%f,%f\n",separatingNormal.x,separatingNormal.y,separatingNormal.z); + + for(int face=0;face<hullB.m_numFaces;face++) + { +#ifdef BT_DEBUG_SAT_FACE + if (once) + printf("face %d\n",face); + const b3GpuFace* faceB = &facesB[hullB.m_faceOffset+face]; + if (once) + { + for (int i=0;i<faceB->m_numIndices;i++) + { + b3Float4 vert = verticesB[hullB.m_vertexOffset+indicesB[faceB->m_indexOffset+i]]; + printf("vert[%d] = %f,%f,%f\n",i,vert.x,vert.y,vert.z); + } + } +#endif //BT_DEBUG_SAT_FACE + //if (facesB[hullB.m_faceOffset+face].m_numIndices>2) + { + const b3Float4 Normal = b3MakeVector3(facesB[hullB.m_faceOffset+face].m_plane.x, + facesB[hullB.m_faceOffset+face].m_plane.y, facesB[hullB.m_faceOffset+face].m_plane.z,0.f); + const b3Float4 WorldNormal = b3QuatRotate(ornB, Normal); +#ifdef BT_DEBUG_SAT_FACE + if (once) + printf("faceNormal = %f,%f,%f\n",Normal.x,Normal.y,Normal.z); +#endif + float d = b3Dot3F4(WorldNormal,separatingNormal); + if (d > dmax) + { + dmax = d; + closestFaceB = face; + } + } + } + once = false; + } + + + b3Assert(closestFaceB>=0); + { + //B3_PROFILE("worldVertsB1"); + const b3GpuFace& polyB = facesB[hullB.m_faceOffset+closestFaceB]; + const int numVertices = polyB.m_numIndices; + for(int e0=0;e0<numVertices;e0++) + { + const b3Float4& b = verticesB[hullB.m_vertexOffset+indicesB[polyB.m_indexOffset+e0]]; + worldVertsB1[numWorldVertsB1++] = b3TransformPoint(b,posB,ornB); + } + } + + if (closestFaceB>=0) + { + //B3_PROFILE("clipFaceAgainstHull"); + numContactsOut = b3ClipFaceAgainstHull((b3Float4&)separatingNormal, &hullA, + posA,ornA, + worldVertsB1,numWorldVertsB1,worldVertsB2,capacityWorldVerts, minDist, maxDist, + verticesA, facesA, indicesA, + contactsOut,contactCapacity); + } + + return numContactsOut; +} + + + + +inline int b3ClipHullHullSingle( + int bodyIndexA, int bodyIndexB, + const b3Float4& posA, + const b3Quaternion& ornA, + const b3Float4& posB, + const b3Quaternion& ornB, + + int collidableIndexA, int collidableIndexB, + + const b3AlignedObjectArray<b3RigidBodyData>* bodyBuf, + b3AlignedObjectArray<b3Contact4Data>* globalContactOut, + int& nContacts, + + const b3AlignedObjectArray<b3ConvexPolyhedronData>& hostConvexDataA, + const b3AlignedObjectArray<b3ConvexPolyhedronData>& hostConvexDataB, + + const b3AlignedObjectArray<b3Vector3>& verticesA, + const b3AlignedObjectArray<b3Vector3>& uniqueEdgesA, + const b3AlignedObjectArray<b3GpuFace>& facesA, + const b3AlignedObjectArray<int>& indicesA, + + const b3AlignedObjectArray<b3Vector3>& verticesB, + const b3AlignedObjectArray<b3Vector3>& uniqueEdgesB, + const b3AlignedObjectArray<b3GpuFace>& facesB, + const b3AlignedObjectArray<int>& indicesB, + + const b3AlignedObjectArray<b3Collidable>& hostCollidablesA, + const b3AlignedObjectArray<b3Collidable>& hostCollidablesB, + const b3Vector3& sepNormalWorldSpace, + int maxContactCapacity ) +{ + int contactIndex = -1; + b3ConvexPolyhedronData hullA, hullB; + + b3Collidable colA = hostCollidablesA[collidableIndexA]; + hullA = hostConvexDataA[colA.m_shapeIndex]; + //printf("numvertsA = %d\n",hullA.m_numVertices); + + + b3Collidable colB = hostCollidablesB[collidableIndexB]; + hullB = hostConvexDataB[colB.m_shapeIndex]; + //printf("numvertsB = %d\n",hullB.m_numVertices); + + + b3Float4 contactsOut[B3_MAX_VERTS]; + int localContactCapacity = B3_MAX_VERTS; + +#ifdef _WIN32 + b3Assert(_finite(bodyBuf->at(bodyIndexA).m_pos.x)); + b3Assert(_finite(bodyBuf->at(bodyIndexB).m_pos.x)); +#endif + + + { + + b3Float4 worldVertsB1[B3_MAX_VERTS]; + b3Float4 worldVertsB2[B3_MAX_VERTS]; + int capacityWorldVerts = B3_MAX_VERTS; + + b3Float4 hostNormal = b3MakeFloat4(sepNormalWorldSpace.x,sepNormalWorldSpace.y,sepNormalWorldSpace.z,0.f); + int shapeA = hostCollidablesA[collidableIndexA].m_shapeIndex; + int shapeB = hostCollidablesB[collidableIndexB].m_shapeIndex; + + b3Scalar minDist = -1; + b3Scalar maxDist = 0.; + + + + b3Transform trA,trB; + { + //B3_PROFILE("b3TransformPoint computation"); + //trA.setIdentity(); + trA.setOrigin(b3MakeVector3(posA.x,posA.y,posA.z)); + trA.setRotation(b3Quaternion(ornA.x,ornA.y,ornA.z,ornA.w)); + + //trB.setIdentity(); + trB.setOrigin(b3MakeVector3(posB.x,posB.y,posB.z)); + trB.setRotation(b3Quaternion(ornB.x,ornB.y,ornB.z,ornB.w)); + } + + b3Quaternion trAorn = trA.getRotation(); + b3Quaternion trBorn = trB.getRotation(); + + int numContactsOut = b3ClipHullAgainstHull(hostNormal, + hostConvexDataA.at(shapeA), + hostConvexDataB.at(shapeB), + (b3Float4&)trA.getOrigin(), (b3Quaternion&)trAorn, + (b3Float4&)trB.getOrigin(), (b3Quaternion&)trBorn, + worldVertsB1,worldVertsB2,capacityWorldVerts, + minDist, maxDist, + verticesA, facesA,indicesA, + verticesB, facesB,indicesB, + + contactsOut,localContactCapacity); + + if (numContactsOut>0) + { + B3_PROFILE("overlap"); + + b3Float4 normalOnSurfaceB = (b3Float4&)hostNormal; +// b3Float4 centerOut; + + b3Int4 contactIdx; + contactIdx.x = 0; + contactIdx.y = 1; + contactIdx.z = 2; + contactIdx.w = 3; + + int numPoints = 0; + + { + B3_PROFILE("extractManifold"); + numPoints = b3ReduceContacts(contactsOut, numContactsOut, normalOnSurfaceB, &contactIdx); + } + + b3Assert(numPoints); + + if (nContacts<maxContactCapacity) + { + contactIndex = nContacts; + globalContactOut->expand(); + b3Contact4Data& contact = globalContactOut->at(nContacts); + contact.m_batchIdx = 0;//i; + contact.m_bodyAPtrAndSignBit = (bodyBuf->at(bodyIndexA).m_invMass==0)? -bodyIndexA:bodyIndexA; + contact.m_bodyBPtrAndSignBit = (bodyBuf->at(bodyIndexB).m_invMass==0)? -bodyIndexB:bodyIndexB; + + contact.m_frictionCoeffCmp = 45874; + contact.m_restituitionCoeffCmp = 0; + + // float distance = 0.f; + for (int p=0;p<numPoints;p++) + { + contact.m_worldPosB[p] = contactsOut[contactIdx.s[p]];//check if it is actually on B + contact.m_worldNormalOnB = normalOnSurfaceB; + } + //printf("bodyIndexA %d,bodyIndexB %d,normal=%f,%f,%f numPoints %d\n",bodyIndexA,bodyIndexB,normalOnSurfaceB.x,normalOnSurfaceB.y,normalOnSurfaceB.z,numPoints); + contact.m_worldNormalOnB.w = (b3Scalar)numPoints; + nContacts++; + } else + { + b3Error("Error: exceeding contact capacity (%d/%d)\n", nContacts,maxContactCapacity); + } + } + } + return contactIndex; +} + + + + + +inline int b3ContactConvexConvexSAT( + int pairIndex, + int bodyIndexA, int bodyIndexB, + int collidableIndexA, int collidableIndexB, + const b3AlignedObjectArray<b3RigidBodyData>& rigidBodies, + const b3AlignedObjectArray<b3Collidable>& collidables, + const b3AlignedObjectArray<b3ConvexPolyhedronData>& convexShapes, + const b3AlignedObjectArray<b3Float4>& convexVertices, + const b3AlignedObjectArray<b3Float4>& uniqueEdges, + const b3AlignedObjectArray<int>& convexIndices, + const b3AlignedObjectArray<b3GpuFace>& faces, + b3AlignedObjectArray<b3Contact4Data>& globalContactsOut, + int& nGlobalContactsOut, + int maxContactCapacity) +{ + int contactIndex = -1; + + + b3Float4 posA = rigidBodies[bodyIndexA].m_pos; + b3Quaternion ornA = rigidBodies[bodyIndexA].m_quat; + b3Float4 posB = rigidBodies[bodyIndexB].m_pos; + b3Quaternion ornB = rigidBodies[bodyIndexB].m_quat; + + + b3ConvexPolyhedronData hullA, hullB; + + b3Float4 sepNormalWorldSpace; + + + + b3Collidable colA = collidables[collidableIndexA]; + hullA = convexShapes[colA.m_shapeIndex]; + //printf("numvertsA = %d\n",hullA.m_numVertices); + + + b3Collidable colB = collidables[collidableIndexB]; + hullB = convexShapes[colB.m_shapeIndex]; + //printf("numvertsB = %d\n",hullB.m_numVertices); + + + + +#ifdef _WIN32 + b3Assert(_finite(rigidBodies[bodyIndexA].m_pos.x)); + b3Assert(_finite(rigidBodies[bodyIndexB].m_pos.x)); +#endif + + bool foundSepAxis = b3FindSeparatingAxis(hullA,hullB, + posA, + ornA, + posB, + ornB, + + convexVertices,uniqueEdges,faces,convexIndices, + convexVertices,uniqueEdges,faces,convexIndices, + + sepNormalWorldSpace + ); + + + if (foundSepAxis) + { + + + contactIndex = b3ClipHullHullSingle( + bodyIndexA, bodyIndexB, + posA,ornA, + posB,ornB, + collidableIndexA, collidableIndexB, + &rigidBodies, + &globalContactsOut, + nGlobalContactsOut, + + convexShapes, + convexShapes, + + convexVertices, + uniqueEdges, + faces, + convexIndices, + + convexVertices, + uniqueEdges, + faces, + convexIndices, + + collidables, + collidables, + sepNormalWorldSpace, + maxContactCapacity); + + } + + return contactIndex; +} + +#endif //B3_CONTACT_CONVEX_CONVEX_SAT_H |