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Read Back Buffers from GPU DirectX 11?

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In DirectX 11, I'm looking to read back some buffer data that is on the GPU. I've done a great deal of research and I feel I'm almost there. I've been able to copy the buffers from GPU memory to system memory for CPU access. What I want to do now is access certain vertices so I can do some calculations.

I have been told that too loop through the buffer, you need to know what the structure of the buffer is. So for example, in this link it describes how a vertex buffer is created:This is


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