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Getting the height values from a greyscale bitmap

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I am trying to make a terrain engine and thus, I must retrieve the height values from the bitmap. This is my current code:

tex->LockRect(0, &rect, NULL, 0);
    if (rect.pBits)
        land.HeightField = (BYTE*)rect.pBits; //the HeightField is type BYTE*

My texture is created with D3DPOOL_MANAGED and 0 for usage. Now that I have my data, How should I make a list of the heights? Thanks

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