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When using vulkan and OpenVR for a game, do I need to create and open a window to make it work or can i just Submit the image to OpenVR?

MineLPPhynix
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Technically you only need to submit the frames to the OpenVR compositor but it is strongly recommends you also display those same frames in a window.

The overhead from doing so is minimal, you are literally just displaying the same textures to a window as well as in the HMD.

Oleg Vorobiov
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