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The setFieldOfView() method of the HMDVRDevice interface can be used to set the field of view for one eye, or both eyes simultaneously.
setFieldOfView(leftFOV, rightFOV, zNear, zFar)
The following simple example shows a function that can be used to set a custom field of view with four specified degree values for up, right, down and left. The VRFieldOfView() constructor is used to create a VRFieldOfView object from the supplied values, which is then fed into the setFieldOfView() method (the default zNear and zFar values are always used, in this case.)
function setCustomFOV(up, right, down, left) {
const testFOV = new VRFieldOfView(up, right, down, left);
gHMD.setFieldOfView(testFOV, testFOV, 0.01, 10000.0);
const lEye = gHMD.getEyeParameters("left");
const rEye = gHMD.getEyeParameters("right");
console.log(lEye.currentFieldOfView);
console.log(rEye.currentFieldOfView);
}
Note: When testing, setting a weird/tiny field of view can really mess up your view. It is a good idea to grab the current field of view first (using VREyeParameters.fieldOfView) before making any drastic changes, so you can reset it afterwards if needed.