protected virtual void Update()
{
// Retrieve the frustum planes from the camera.
frustumPlanes = GeometryUtility.CalculateFrustumPlanes(Camera.main);
// Determine if the Tagalong needs to move based on whether its
// BoxCollider is in or out of the camera's view frustum.
Vector3 tagalongTargetPosition;
if (CalculateTagalongTargetPosition(transform.position, out tagalongTargetPosition))
{
// Derived classes will use the same Interpolator and may have
// adjusted its PositionUpdateSpeed for some other purpose.
// Restore the value we care about and tell the Interpolator
// to move the Tagalong to its new target position.
interpolator.PositionPerSecond = PositionUpdateSpeed;
interpolator.SetTargetPosition(tagalongTargetPosition);
}
else if (!interpolator.Running && EnforceDistance)
{
// If the Tagalong is inside the camera's view frustum, and it is
// supposed to stay a fixed distance from the camera, force the
// tagalong to that location (without using the Interpolator).
Ray ray = new Ray(Camera.main.transform.position, transform.position - Camera.main.transform.position);
transform.position = ray.GetPoint(TagalongDistance);
}
}
private void Manipulate()
{
// First step is to figure out the delta between the initial hand position and the current hand position
Vector3 localHandPosition = Camera.main.transform.InverseTransformPoint(GestureManager.Instance.ManipulationHandPosition);
Vector3 initialHandToCurrentHand = localHandPosition - initialHandPosition;
Vector3 scaledLocalHandPositionDelta = Vector3.Scale(initialHandToCurrentHand, handPositionScale);
Vector3 localObjectPosition = initialObjectPosition + scaledLocalHandPositionDelta;
Vector3 worldObjectPosition = Camera.main.transform.TransformPoint(localObjectPosition);
// Rotate this object to face the user.
Quaternion toQuat = Camera.main.transform.localRotation;
toQuat.x = 0;
toQuat.z = 0;
this.transform.rotation = toQuat;
// If the object has an interpolator we should use it, otherwise just move the transform directly
if (targetInterpolator != null)
{
targetInterpolator.SetTargetPosition(worldObjectPosition);
}
else
{
this.transform.position = worldObjectPosition;
}
}