private static void FillGazeRayFrom(ref TobiiXR_GazeRay gazeRay, tobii_validity_t originValidity, TobiiVector3 origin, tobii_validity_t directionValidity, TobiiVector3 direction, Vector3 headToCenterEyeTranslation)
{
gazeRay.IsValid =
originValidity == tobii_validity_t.TOBII_VALIDITY_VALID &&
directionValidity == tobii_validity_t.TOBII_VALIDITY_VALID;
gazeRay.Origin.x = origin.x * -1 / 1000f;
gazeRay.Origin.y = origin.y / 1000f;
gazeRay.Origin.z = origin.z / 1000f;
gazeRay.Origin += headToCenterEyeTranslation;
gazeRay.Direction.x = direction.x * -1;
gazeRay.Direction.y = direction.y;
gazeRay.Direction.z = direction.z;
}
/// <summary>
/// Converts gaze rays to projected gaze points in screen space coordinates.
/// Be aware that screen space and texture space may have different Y directions. Also be aware that in single pass rendering the screen buffer contains both eyes so you would have to renormalize the x value of left and right gaze point.
/// </summary>
/// <param name="leftGazeRayViewSpace">Left gaze ray in view space coordinates.</param>
/// <param name="rightGazeRayViewSpace">Right gaze ray in view space coordinates.</param>
/// <param name="leftGazePoint">Normalized Gaze point where 0, 0 is bottom left and 1, 1 is top right of the left screen. Null means no value could be produced.</param>
/// <param name="rightGazePoint">Normalized Gaze point where 0, 0 is bottom left and 1, 1 is top right of the right screen. Null means no value could be produced.</param>
public static void GetScreenSpaceFor(TobiiXR_GazeRay leftGazeRayViewSpace, TobiiXR_GazeRay rightGazeRayViewSpace, out Vector2?leftGazePoint, out Vector2?rightGazePoint)
{
leftGazePoint = null;
rightGazePoint = null;
var cam = CameraHelper.GetMainCamera();
Vector3 leftOffset;
Vector3 rightOffset;
if (!GetEyeOffsets(out leftOffset, out rightOffset))
{
return;
}
if (leftGazeRayViewSpace.IsValid)
{
leftGazePoint = GetScreenSpaceFor(leftGazeRayViewSpace.Direction, leftOffset - leftGazeRayViewSpace.Origin, cam.GetStereoProjectionMatrix(Camera.StereoscopicEye.Left));
}
if (rightGazeRayViewSpace.IsValid)
{
rightGazePoint = GetScreenSpaceFor(rightGazeRayViewSpace.Direction, rightOffset - rightGazeRayViewSpace.Origin, cam.GetStereoProjectionMatrix(Camera.StereoscopicEye.Right));
}
}
private void SetPositionAndScale(TobiiXR_GazeRay gazeRay)
{
RaycastHit hit;
var distance = _defaultDistance;
if (Physics.Raycast(gazeRay.Origin, gazeRay.Direction, out hit))
{
distance = hit.distance;
}
var interpolatedGazeDirection = Vector3.Lerp(_lastGazeDirection, gazeRay.Direction,
_smoothMoveSpeed * Time.unscaledDeltaTime);
var usedDirection = _smoothMove ? interpolatedGazeDirection.normalized : gazeRay.Direction.normalized;
transform.position = gazeRay.Origin + usedDirection * distance;
transform.localScale = Vector3.one * distance * ScaleFactor;
transform.forward = usedDirection.normalized;
_lastGazeDirection = usedDirection;
}
private static void TransformToWorldSpace(ref TobiiXR_GazeRay eyeData, Matrix4x4 hmdOrigin)
{
eyeData.Origin = hmdOrigin.MultiplyPoint(eyeData.Origin);
eyeData.Direction = hmdOrigin.MultiplyVector(eyeData.Direction);
}
private static void TransformToWorldSpace(ref TobiiXR_GazeRay eyeData, Transform hmdOrigin)
{
eyeData.Origin = hmdOrigin.TransformPoint(eyeData.Origin);
eyeData.Direction = hmdOrigin.TransformDirection(eyeData.Direction);
}
