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Unity Stereo Matrices

edited January 2017 in General

Is there any away in Unity to get the stereo view and projection matrices for the Hololens? I really want to save the previous frame's view and proj matrices for various effects. I've tried everything I can think of:
1) Camera.GetStereoViewMatrix and Camera.GetStereoProjectionMatrix are always identity.
2) The camera's transform/Camera.worldToCameraMatrix and GL.GetGPUProjectionMatrix do not produce correct View-projection matrices. In fact they are always the same for both cameras.
3) I've tried Material.GetMatrix("UNITY_MATRIX_V") and Material.GetMatrix("UNITY_MATRIX_P"), which always fail, likely because they are packed in Constant Buffers (UnityShaderVariables.cginc).
4) I've tried writing a native UWP dll that manually extracts camera poses from a HolographicFrame, yet HolographicSpace::CreateForCoreWindow barfs (SEH) because Unity has already done it for the app's CoreWindow.

Am I missing something? These seems like fundamental data that should be readily available.

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