DirectX SDK version Unity 5.3.1 is built with??

What version of the DirectX SDK is the Unity3D Windows standalone runtime built with? (June 2010?)
I need to make a native plugin that gets a ID3D11Resource from a Texture2D / RenderTexture.

Right now doing anything with the ID3D11Resource* pointer crashes the runtime.
Do the SDK versions matter, Iv'e never tried to mix / mash before.

EDIT: Never mind goof in my code on my part...

 

Are you sure about this? This forum post said switching the D3D SDK version helps: http://forum.unity3d.com/threads/rendering-to-a-texture-from-a-plugin-d3d11.340435/

Also Unity3D just crashes when trying to run the simple code below invoked from the MonoBehavior "void OnPostRender()" attached to a Camera that renders to a RenderTexture.
NOTE: It crashes at "OMSetRenderTargets". (I'm just getting the last RenderTarget and Reseting it to the same thing)

#C CODE
[DllImport("VR_ExtendedMode", EntryPoint="VR_PostRender")]
private static extern void VR_PostRender();

void OnPostRender()
{
VR_PostRender();
}

C/C++ CODE
extern "C" __declspec(dllexport) void VR_PostRender()
{
const int count = 1;
ID3D11RenderTargetView *lastRT[count] = {0};
ID3D11DepthStencilView *lastDepth[count] = { 0 };
unityDeviceContext->OMGetRenderTargets(count, &lastRT[0], &lastDepth[0]);// works fine
// TODO: do nothing for now...
unityDeviceContext->OMSetRenderTargets(count, &lastRT[0], lastDepth[0]);// crashes Unity
}

 

I guess I should ask what method in Unity can we apply a custom render target and clear it?
OnPostRender seems to almost work but then crashes.
OnRenderObject just crashes.
Update just crashes.

 

I think the info I'm looking for is located here: http://docs.unity3d.com/Manual/NativePluginInterface.html

 

Awesome tnx, I should be able to get things working now! It felt like a threading error when testing but wasn't sure. This helps answer some of my confusion.