Unity method for calculating screen-space position a world space object. Useful for showing something on screen that is not visible in VR.

WorldToScreenVR.cs

/// <summary>
/// Calculates screen-space position a world space object. Useful for showing something on screen that is not visible in VR.
/// For example, it can be used to update the position of a marker that highlights the gaze of the player, using eye tracking.
/// </summary>
/// <param name="camera">The camera used for VR rendering.</param>
/// <param name="worldPos">World position of a point.</param>
/// <returns>Screen position of a point.</returns>
static Vector2 WorldToScreenVR(Camera camera, Vector3 worldPos)
{
    Vector3 screenPoint = camera.WorldToViewportPoint(worldPos);
    float w = XRSettings.eyeTextureWidth;
    float h = XRSettings.eyeTextureHeight;
    float ar = w / h;

    screenPoint.x = (screenPoint.x - 0.15f * XRSettings.eyeTextureWidth) / 0.7f;
    screenPoint.y = (screenPoint.y - 0.15f * XRSettings.eyeTextureHeight) / 0.7f;

    return screenPoint;
}

Stores XRSettings.eyeTexture dimensions in variables
Doesn't use them

Guilty