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Adding vertices to a D3DXMesh..

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I am trying to extend my mesh class (remember my demo?), by giving the ability to add vertices to an already loaded mesh. I specify D3DXMESH_DYNAMIC for the mesh flags without MANAGED, so it can be correct. Here is my add vertex code: [cpp] void CRTStaticMesh::AddVertex(Vec3* vertex) { if (meshes.bProgressive) return; Vec3* vertices=NULL; //get the VB meshes.pMesh->GetVertexBuffer(&meshes.pVB); meshes.pVB->Lock(0, 0, (void**)&vertices, D3DLOCK_DISCARD); memcpy(vertices, vertex, sizeof(vertex)); meshes.pVB->Unlock(); SR(meshes.pVB); } [/cpp] Also, should I lock my VB with DISCARD or NOSYSLOCK? I am sure that there will be no disp mode changes, so whats the difference? Btw, the above code isnt adding the vertex, meaning I cannot see it rendered along with the other vertices. Whats wrong here? Thanks!

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