ovrFovPort_

Field Of View (FOV) in tangent of the angle units. As an example, for a standard 90 degree vertical FOV, we would have: { UpTan = tan(90 degrees / 2), DownTan = tan(90 degrees / 2) }. The tangent of the angle between the viewing vector and the top edge of the field of view. The tangent of the angle between the viewing vector and the bottom edge of the field of view. The tangent of the angle between the viewing vector and the left edge of the field of view. The tangent of the angle between the viewing vector and the right edge of the field of view.