protected virtual void GrabBegin()
{
float closestMagSq = float.MaxValue;
OVRGrabbable closestGrabbable = null;
Collider closestGrabbableCollider = null;
// Iterate grab candidates and find the closest grabbable candidate
foreach (OVRGrabbable grabbable in m_grabCandidates.Keys)
{
bool canGrab = !(grabbable.isGrabbed && !grabbable.allowOffhandGrab);
if (!canGrab)
{
continue;
}
for (int j = 0; j < grabbable.grabPoints.Length; ++j)
{
Collider grabbableCollider = grabbable.grabPoints[j];
// Store the closest grabbable
Vector3 closestPointOnBounds = grabbableCollider.ClosestPointOnBounds(m_gripTransform.position);
float grabbableMagSq = (m_gripTransform.position - closestPointOnBounds).sqrMagnitude;
if (grabbableMagSq < closestMagSq)
{
closestMagSq = grabbableMagSq;
closestGrabbable = grabbable;
closestGrabbableCollider = grabbableCollider;
}
}
}
// Disable grab volumes to prevent overlaps
GrabVolumeEnable(false);
if (closestGrabbable != null)
{
if (closestGrabbable.isGrabbed)
{
closestGrabbable.grabbedBy.OffhandGrabbed(closestGrabbable);
}
m_grabbedObj = closestGrabbable;
m_grabbedObj.GrabBegin(this, closestGrabbableCollider);
m_lastPos = transform.position;
m_lastRot = transform.rotation;
// Set up offsets for grabbed object desired position relative to hand.
if (m_grabbedObj.snapPosition)
{
m_grabbedObjectPosOff = m_gripTransform.localPosition;
if (m_grabbedObj.snapOffset)
{
Vector3 snapOffset = m_grabbedObj.snapOffset.position;
if (m_controller == OVRInput.Controller.LTouch)
{
snapOffset.x = -snapOffset.x;
}
m_grabbedObjectPosOff += snapOffset;
}
}
else
{
Vector3 relPos = m_grabbedObj.transform.position - transform.position;
relPos = Quaternion.Inverse(transform.rotation) * relPos;
m_grabbedObjectPosOff = relPos;
}
if (m_grabbedObj.snapOrientation)
{
m_grabbedObjectRotOff = m_gripTransform.localRotation;
if (m_grabbedObj.snapOffset)
{
m_grabbedObjectRotOff = m_grabbedObj.snapOffset.rotation * m_grabbedObjectRotOff;
}
}
else
{
Quaternion relOri = Quaternion.Inverse(transform.rotation) * m_grabbedObj.transform.rotation;
m_grabbedObjectRotOff = relOri;
}
// NOTE: force teleport on grab, to avoid high-speed travel to dest which hits a lot of other objects at high
// speed and sends them flying. The grabbed object may still teleport inside of other objects, but fixing that
// is beyond the scope of this demo.
MoveGrabbedObject(m_lastPos, m_lastRot, true);
// NOTE: This is to get around having to setup collision layers, but in your own project you might
// choose to remove this line in favor of your own collision layer setup.
SetPlayerIgnoreCollision(m_grabbedObj.gameObject, true);
if (m_parentHeldObject)
{
m_grabbedObj.transform.parent = transform;
}
PickUpManager.ItemPickedUp(m_grabbedObj.gameObject);
}
}