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draw a terrain(I'm totally confused)

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Hi guys.

I want to draw a terrain grid.Code here:

HR(D3DXCreateMesh(m_dwFaceNum,m_dwVertexNum,D3DXMESH_SYSTEMMEM|D3DXMESH_32BIT,terrainElement,m_pd3dD,&m_pMesh));
std::vector<D3DXVECTOR3> pos;
std::vector<DWORD> index;
SFDrawGrid(pos,index,m_iTerrainWH,m_iTerrainWH,(float)m_iBlockWH);
OPNVERTEX *tempV = NULL;
HR(m_pMesh->LockVertexBuffer(0,(void**)&tempV));
for(UINT i = 0 ;i<m_dwVertexNum;++i)
{
tempV.position = pos;
tempV.position.y = m_fHeightMap;
}
HR(m_pMesh->UnlockVertexBuffer());

when i = 33107 ,there is a error:

First-chance exception at 0x00a66ead in ObserveDemo.exe: 0xC0000005: Access violation writing location 0x045d2008.
Unhandled exception at 0x00a66ead in ObserveDemo.exe: 0xC0000005: Access violation writing location 0x045d2008.

I am totally confused why the error occur.

forgive my poor english.
any help is appreciated

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Try running your application in debug mode. How to do that depends on your IDE:

In Visual Studio, it's choosing Debug from a dropbox in your main toolbar.
In Code::Blocks, press F8.
If you use Dev-c++, remove it immediately.

Hope that helps.

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Have you checked that pos.size()==m_dwVertexNum before you load the vertices? Is m_fHeightMap the correct size? Does it have m_dwVertexNum entries?

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I think I find what's wrong with my code.

D3DVERTEXELEMENT9 terrainElement[] =
{
{0,0,D3DDECLTYPE_FLOAT3,D3DDECLMETHOD_DEFAULT,D3DDECLUSAGE_POSITION,0},
{0,12,D3DDECLTYPE_FLOAT3,D3DDECLMETHOD_DEFAULT,D3DDECLUSAGE_NORMAL,0},

D3DDECL_END()
};

where must be 12 ,I was used 0.

thanks you all.

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