vrhmd device object

An object of type vrhmd runs a virtual reality head-mounted display supported by Psychtoolbox. To use a VRHMD, add one or more columns for a vrhmd object in the optional table for objects not specific to trial (experiment, device, staircase objects). Note if you want to leave all properties at default, you can make one column and set the object heading (row 1) but leave the property heading (row 2) as well as the cell in row 3 blank. [Or in the coding method: Make a vrhmd object outside trials using function vrhmdObject, set any properties needed, and input it to addToExperiment.]

A vrhmd object is also a screen object, i.e. it has all the properties of a screen object, and some additional ones. If you use a vrhmd object, it takes the place of a screen object.

See Psychtoolbox documentation for extra requirements for VRHMDs, e.g. 
http://psychtoolbox.org/docs/OculusVR for the Oculus Rift.

‍Currently VRHMDs only work in monoscopic or 2D stereo modes (property stereo below), not 3D head tracking mode.

options
quality

Default, changeable in pb_prefs: options = Psychtoolbox default
Default, changeable in pb_prefs: quality = lowest quality, highest speed

options is a string that goes to Psychtoolbox PsychVRHMD('AutoSetupHMD') input basicRequirements. See PsychVRHMD help text for more information.

quality is a number between 0–1 setting quality/performance tradeoff: 0 = lowest quality, highest speed, 1 = highest quality, lowest speed.

Input properties all screens have

Notes on how some of these properties work for vrhmd objects:

n_screen
The default value (highest attached screen number) is usually the HMD.

height_cm
distance_cm
These properties retain their meanings: display panel height and distance from eye (lens) to panel.

openRect
Ignored for vhrmd objects.

stereo
stereoOptions
For vrhmd objects, stereo is just the number 0 or 1: 0 = monoscopic, 1 = 2D stereo. For stereo display, as usual you can use element property nn_eyes to set whether an element shows on left/right/both eyes.

beforeOpenCode
openCode
afterOpenCode
beforeOpenCode code runs after the HMD is opened (with the imaging pipeline).
For vrhmd objects, code in all these properties can also use variable ptbVrhmd containing the Psychtoolbox HMD handle returned by PsychVRHMD('AutoSetupHMD').