Function ovr_sys::ovrMatrix4f_OrthoSubProjection

pub unsafe extern "C" fn ovrMatrix4f_OrthoSubProjection(
    projection: ovrMatrix4f,
    orthoScale: ovrVector2f,
    orthoDistance: f32,
    HmdToEyeOffsetX: f32
) -> ovrMatrix4f

Generates an orthographic sub-projection.

Used for 2D rendering, Y is down.

in projection The perspective matrix that the orthographic matrix is derived from.

in orthoScale Equal to 1.0f / pixelsPerTanAngleAtCenter.

in orthoDistance Equal to the distance from the camera in meters, such as 0.8m.

in HmdToEyeOffsetX Specifies the offset of the eye from the center.

Returns the calculated projection matrix.