opiPhoneHMD

OPI server on Phone (Android platform). Requires a head-mounted headset that is compatible with Google Cardboard.

• Server: Android phone
• Client: Desktop

The Server and the Client must be in the same LAN.

Protocols

Command                  Description                 
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OPI_GET_METRICS          Returns the x and y screen resolution, x and y FOV,
                         and pixel density.

OPI_SET_BACKGROUND       Sets background color and luminance for left eye,
                         right eye or both. Sets fixation target shape,
                         color, and luminance for left eye, right eye or
                         both.

OPI_PRESENT              Presents a visual stimulus to the left eye, The
                         right eye or both at a specific (x, y) coordinate
                         with a specific luminance, color, and x and y
                         sizes. The stimulus is presented.

OPI_CLOSE                Terminates client connection OK | error message    

FOV = Field of view in degrees.

FOV, all positions, and sizes are in degrees of visual.

Luminance and each color channel should be a normalized float value from 0 to 1. Pixel density is in dots per inch (dpi) and screen resolution are in pixels.

Colors are defined by a 4-element vector for R, G, B channels and the alpha channel, which allows transparency. All 4 channels are float values from 0 to 1.

The physical dimensions of the phone can be calculated with help of the FOV.