private void Awake()
{
cachedTrans = transform;
cachedCam = GetComponent <Camera>();
currentlyHolding = null;
prevHeldVelocity = 0f;
curDragDistance = defaultDragDistance;
}
private void Update()
{
// Control the hand rig positioning and try to avoid clipping using the raycast.
UpdateHandVisual();
// Controlling hand distance by scrolling.
float scrollWheel = Input.GetAxis("Mouse ScrollWheel");
if (scrollWheel < -Mathf.Epsilon)
{
curDragDistance -= dragDistanceStep;
curDragDistance = Mathf.Max(minDragDistance, curDragDistance);
}
else if (scrollWheel > Mathf.Epsilon)
{
curDragDistance += dragDistanceStep;
curDragDistance = Mathf.Min(curDragDistance, maxDragDistance);
}
// Handle dragging and releasing/tossing an object.
if (Input.GetMouseButtonDown(0))
{
Ray rayToCursor = cachedCam.ScreenPointToRay(Input.mousePosition);
RaycastHit hit;
// Buffer distance to allow grabbing objects further from hand.
float rayDistance = curDragDistance * 2f;
if (Physics.Raycast(rayToCursor, out hit, rayDistance))
{
if (currentlyHolding != null)
{
// Ensure previously held object is released before holding new object.
ReleaseHeldObject();
}
TossableObject tossable = hit.collider.GetComponent <TossableObject>();
if (tossable != null)
{
// Grab the object so that it's centered around where the cursor was on the object.
grabObjOffset = hit.collider.bounds.center - hit.point;
HoldObject(tossable);
}
}
}
else
{
if (Input.GetMouseButtonUp(0) && currentlyHolding != null)
{
ReleaseHeldObject();
}
}
}
private void HoldObject(TossableObject obj)
{
if (obj == null)
{
ReleaseHeldObject();
return;
}
currentlyHolding = obj;
prevHeldVelocity = obj.cachedRigid.velocity.magnitude;
// Updating hand distance to where the visual hand is.
curDragDistance = visualHandDist;
curDragDistance = Mathf.Clamp(curDragDistance, minDragDistance, maxDragDistance);
// Send grab event.
currentlyHolding.OnGrabbed();
// "Freeze" rotation while held. Restore angular drag upon releasing.
rigidOrigAngDrag = obj.cachedRigid.angularDrag;
obj.cachedRigid.angularDrag = 10f;
}
private void ReleaseHeldObject()
{
if (currentlyHolding == null)
{
return;
}
// No need to add force since the velocity is already set during drag in FixedUpdate.
// Restore original angular drag prior to grabbing.
currentlyHolding.cachedRigid.angularDrag = rigidOrigAngDrag;
// Add torque based on multiple factors.
// Faster objects have more torque.
float velocityTorqueFactor = currentlyHolding.cachedRigid.velocity.magnitude * 0.0005f;
// Grabbing object near the edge will add more torque as opposed to grabbing near middle.
float grabOffCenterTorqueFactor = grabObjOffset.magnitude * 0.002f;
float torqueAmount = 0.0005f + velocityTorqueFactor + grabOffCenterTorqueFactor;
currentlyHolding.cachedRigid.AddTorque(Random.onUnitSphere * torqueAmount, ForceMode.Impulse);
// Send toss event for boomerang and other behaviors.
currentlyHolding.OnTossed();
currentlyHolding = null;
}
