in A7 I get an error message because of "pvertexdecl", it is said to be undeclared in the line of "D3DXCreateMesh(merged_triangles,merged_vertices,D3DXMESH_MANAGED,pvertexdecl,pd3ddev,&mesh1);"
but some dx things differs in A7 and A8, I can check by A8 only at home.