C++ 如何深度复制子弹物理中的btTriangleMesh？
我使用子弹物理，需要复制C++ 如何深度复制子弹物理中的btTriangleMesh？,c++,pointers,heap,copy-constructor,bulletphysics,C++,Pointers,Heap,Copy Constructor,Bulletphysics,我使用子弹物理，需要复制btTriangleMesh类型的实例 // the variable is a class member btTriangleMesh triangles; 我的目标是将实体的碰撞形状更改为新的三角形网格形状。此形状应保存当前存储在三角形变量中的数据，即使该变量将来会更改。因此，我需要一份深度副本 // in a method change collision shape btTriangleMesh *copy = new btTriangleMesh(triang
btTriangleMesh// the variable is a class member
btTriangleMesh triangles;
三角形// in a method change collision shape
btTriangleMesh *copy = new btTriangleMesh(triangles);
btBvhTriangleMeshShape *shape = new btBvhTriangleMeshShape(copy), true, true);
body->setCollisionShape(shape);
// after that, reset variable
triangles = btTriangleMesh();
// change content of variable for next body
// ...
newbttrianglemesh（triangles）btTriangleMesh顺便说一句，我使用相同的变量作为所有三角形形状的源的原因是这个变量由另一个线程异步填充。我自己花了一些时间研究这个问题 您可以通过访问btTriangleMesh的getIndexedMeshArray[0]来深度复制btTriangleMesh btTriangleMesh不使用多个btIndexedMesh 使用args（true，true）构造所有BTTriangleMesh，以强制索引和顶点数组分别为Integer和btVector3类型 下面是我编写的一些代码，用于从btTriangleMesh提取三角形，并将它们放入我自己的模型数据类IndexedModel中
IndexedModel retrieveIndexedModelFromTriMesh(btTriangleMesh* trimesh){
IndexedModel retval;
//We will assume it was created using true, true
btIndexedMesh& mushy = trimesh->getIndexedMeshArray()[0]; //typedef btAlignedObjectArray< btIndexedMesh > IndexedMeshArray
size_t numVerts = mushy.m_numVertices;
size_t numTris = mushy.m_numTriangles;
size_t numIndices = numTris * 3;
PHY_ScalarType indexType = mushy.m_indexType;
PHY_ScalarType vertexType = mushy.m_vertexType;
if(indexType != PHY_INTEGER)
return getErrorShape("Error, tri mesh was apparently made using Short indices");
btVector3* vertArray = (btVector3*)mushy.m_vertexBase;
int* indArray = (int*)mushy.m_triangleIndexBase;
for(size_t i = 0; i < numIndices; i++){
retval.indices.push_back(retval.positions.size());
glm::vec3 pos = b2g_vec3(vertArray[indArray[i]]);
retval.positions.push_back(pos);
}
retval.validate(); //fills in texcoords and normals for exporting to OBJ
return retval;
//Vertex Stride is sizeof(btVector3)
//Index stride is sizeof(int) * 3 (per triangle, of course)
}
IndexedModelRetrieveIndexedModelFromTrimesh（btTriangleMesh*trimesh）{
IndexedModel retval；
//我们假设它是用true，true创建的
btIndexedMesh&mushy=trimesh->getIndexedMeshArray（）[0]；//typedef btAlignedObjectArrayIndexedMeshArray
尺寸=糊状物的重量；
粒径=糊状的纳米三角形；
尺寸=numTris*3；
PHY_ScalarType indexType=mushy.m_indexType；
PHY_ScalarType vertexType=mushy.m_vertexType；
if（indexType！=PHY\u整数）
return getErrorShape（“错误，三重网格显然是使用短索引制作的”）；
btVector3*vertArray=（btVector3*）mushy.m_vertexBase；
int*indArray=（int*）mushy.m_triangleIndexBase；
对于（大小i=0；i