/// <summary>
/// Update cursor position on canvas based on a ray originating at the VR headset's position and using the headset's forward direction.
/// </summary>
private void TrackHead()
{
Vector3 direction = VRCamera.transform.forward;
Ray ray = new Ray(_rayOrigin, direction);
CurrentHeadGazeScreenPoint = VRCamera.WorldToScreenPoint(_rayOrigin + ray.direction * POINT_CALCULATION_DISTANCE);
HandleHeadRay(ray);
}
/// <summary>
/// Update cursor position on screen based on the eye gaze ray from VRHMD (if using eyetracking as control method).
/// This function is also called if RecordGazePosition is true, in which case the ray is still handled but the cursor position is not updated.
/// This is in case we want to record gaze position regardless of using eyetracking as control method.
/// </summary>
private void TrackEyes()
{
List <Vector3> eyeDirections = new List <Vector3>();
switch (TestController.Instance.TestBlockData.SelectedVRHMD)
{
case TestBlock.VRHMD.VIVE:
Vector3 gaze = Pupil.values.GazePoint3D;
//Transform and correct eye-tracking
gaze = (transform.rotation * gaze).normalized;
Vector3 delta = transform.forward.normalized - gaze;
gaze = gaze + delta * 2;
//float eyeConfidence = (Pupil.values.Confidences[0] + Pupil.values.Confidences[1]) / 2.0f;
//if (eyeConfidence > 0.7f)
//{
eyeDirections.Add(gaze);
//}
break;
case TestBlock.VRHMD.FOVE:
FoveInterface.EyeRays rays = _foveInterface.GetGazeRays();
EFVR_Eye eyeClosed = FoveInterface.CheckEyesClosed();
switch (eyeClosed)
{
case (EFVR_Eye.Neither):
eyeDirections.Add(rays.left.direction);
eyeDirections.Add(rays.right.direction);
break;
case (EFVR_Eye.Left):
eyeDirections.Add(rays.right.direction);
break;
case (EFVR_Eye.Right):
eyeDirections.Add(rays.left.direction);
break;
case (EFVR_Eye.Both):
eyeDirections.Add(Vector3.zero);
break;
}
break;
}
Vector3 direction = Vector3.zero;
foreach (Vector3 eyeDirection in eyeDirections)
{
direction += eyeDirection;
}
direction = direction / eyeDirections.Count;
Ray ray = new Ray(_rayOrigin, direction);
ray = GetAverageEyeRay(ray);
CurrentEyeGazeScreenPoint = VRCamera.WorldToScreenPoint(_rayOrigin + ray.direction * POINT_CALCULATION_DISTANCE);
if (CurrentControlMethod == TestBlock.ControlMethod.Eyetracking)
{
HandleRay(ray);
}
else
{
HandleGazeTrackingRay(ray);
}
Debug.DrawRay(ray.origin, ray.direction * 100);
}