用PhysX转化地形为trianglemesh

来源：互联网发布：冰山算法编辑：程序博客网时间：2024/05/06 10:47

http://m.blog.csdn.net/blog/perfection_c/4463599

在利用NxOgre添加地形的时候遇到了问题，不知道改如何添加地形，使用模型？还是直接读取高度图？因为是刚刚接触到NxOgre对于这些问题很是迷茫，苦苦找不到解决的问题。在网上搜索有关资料也很少，最近在GameRes论坛里面发现了一篇有关于用PhysX转化地形为trianglemesh的文章，所以转过来看看，希望对我以及和我遇到同样问题的朋友有所帮助！

NxActor * CPhysX::CreateTerrainMesh(const NxVec3& pos,const NxU32 length, const NxU32 width,IDirect3DVertexBuffer9* vb,IDirect3DIndexBuffer9* ib)//,const NxReal stride)
{
NxVec3* fsVerts = NULL;
WORD* fsFaces = NULL;

//初始化平面 verts
NxU32 nbVerts=length*width;

   fsVerts = new NxVec3[nbVerts];
   VertexPNUVT* vCol = 0;
   vb->Lock(0,0,(void**)&vCol,0);
   for(DWORD i=0;i<nbVerts;i++)
   {
memcpy(&fsVerts[i], &vCol[i], sizeof(D3DXVECTOR3));
   }
   vb->Unlock();

   NxU32 nbFaces = (length-1)*(width-1)*2;
   fsFaces = new WORD[nbFaces*3];
   WORD* pIB = NULL;
   ib->Lock(0,0,(void**)&pIB,0);
   memcpy(fsFaces, pIB, sizeof(WORD)*nbFaces*3);
   ib->Unlock();

   NxTriangleMeshDesc fsDesc;
   fsDesc.numVertices = nbVerts;
   fsDesc.numTriangles =nbFaces;
   fsDesc.pointStrideBytes = sizeof(D3DXVECTOR3);
   fsDesc.triangleStrideBytes = 3*sizeof(WORD);
   fsDesc.points = fsVerts;
   fsDesc.triangles = fsFaces;
   fsDesc.flags =NX_MF_16_BIT_INDICES;

//因为连续三角网格是不特定常规武器公约因此必须设置，以确保正确的碰撞
fsDesc.flags |=NX_MF_FLIPNORMALS;

NxTriangleMeshShapeDesc fsShapeDesc;

   gCooking = NxGetCookingLib(NX_PHYSICS_SDK_VERSION);
   bool ok = gCooking->NxInitCooking();

   // Cooking from memory
   MemoryWriteBuffer buf;
   bool status = gCooking->NxCookTriangleMesh(fsDesc, buf);

fsShapeDesc.meshData = PhysicsSDK->createTriangleMesh(MemoryReadBuffer(buf.data));

   if (fsShapeDesc.meshData)
   {
NxActorDesc actorDesc;
actorDesc.shapes.pushBack(&fsShapeDesc);
actorDesc.globalPose.t = pos;
NxActor* actor = Scene->createActor(actorDesc);
//SetActorCollisionGroup(actor,3);
return actor;
//      gPhysicsSDK->releaseTriangleMesh(*fsShapeDesc.meshData);
   }

return NULL;

}

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