/// <summary>
/// Writes the desired rotation values for each joint based on the provided SnapAddress.
/// Apart from the rotations it also writes in the syntheticHand if it should allow rotations
/// past that.
/// When no snap is provided, it frees all fingers allowing unconstrained tracked motion.
/// </summary>
private void UpdateFingers(HandPose handPose, HandFingerFlags grabbingFingers, float strength)
{
Quaternion[] desiredRotations = handPose.JointRotations;
_syntheticHand.OverrideAllJoints(desiredRotations, strength);
for (int fingerIndex = 0; fingerIndex < Constants.NUM_FINGERS; fingerIndex++)
{
int fingerFlag = 1 << fingerIndex;
JointFreedom fingerFreedom = handPose.FingersFreedom[fingerIndex];
if (fingerFreedom == JointFreedom.Constrained &&
((int)grabbingFingers & fingerFlag) != 0)
{
fingerFreedom = JointFreedom.Locked;
}
_syntheticHand.SetFingerFreedom((HandFinger)fingerIndex, fingerFreedom);
}
}
private Rect DrawFingersFreedomMenu(SerializedProperty property, Rect position)
{
_foldedFreedom = EditorGUI.Foldout(position, _foldedFreedom, "Fingers Freedom", true);
position.y += EditorConstants.ROW_HEIGHT;
if (_foldedFreedom)
{
SerializedProperty fingersFreedom = property.FindPropertyRelative("_fingersFreedom");
EditorGUI.indentLevel++;
for (int i = 0; i < Constants.NUM_FINGERS; i++)
{
SerializedProperty finger = fingersFreedom.GetArrayElementAtIndex(i);
HandFinger fingerID = (HandFinger)i;
JointFreedom current = (JointFreedom)finger.intValue;
JointFreedom selected = (JointFreedom)EditorGUI.EnumPopup(position, $"{fingerID}: ", current);
finger.intValue = (int)selected;
position.y += EditorConstants.ROW_HEIGHT;
}
EditorGUI.indentLevel--;
}
return(position);
}
/// <summary>
/// Updates the rotation of the joints in the hand
/// using the visual provided values. Sometimes this
/// might require lerping between the tracked pose
/// and the provided ones to improve the movement of the fingers
/// without worrying about when the overwrite values were written.
///
/// During this update the modifier also ensures that fingers that disallow
/// some movement (locked or constrained) have their values properly set, and
/// when there is an unlock event the finger values are smoothly animated back to
/// their tracked rotations.
/// </summary>
/// <param name="data">The entire hand data structure to read and write the joints rotations from</param>
private void UpdateJointsRotation(HandDataAsset data)
{
float extraRotationAllowance = 0f;
Quaternion[] jointRotations = data.Joints;
for (int i = 0; i < FingersMetadata.HAND_JOINT_IDS.Length; ++i)
{
JointFreedom freedomLevel = _jointsFreedomLevels[i];
Quaternion desiredRotation = _desiredJointsRotation[i];
float overrideFactor = _jointsOverrideFactor[i];
int rawJointIndex = (int)FingersMetadata.HAND_JOINT_IDS[i];
if (freedomLevel == JointFreedom.Free)
{
//nothing to do, we move the finger freely
}
else if (freedomLevel == JointFreedom.Locked)
{
jointRotations[rawJointIndex] = Quaternion.Slerp(
jointRotations[rawJointIndex],
desiredRotation,
overrideFactor);
}
else if (freedomLevel == JointFreedom.Constrained)
{
bool jointCanSpread = false;
if (FingersMetadata.HAND_JOINT_CAN_SPREAD[i])
{
jointCanSpread = true;
extraRotationAllowance = 0f;
}
Quaternion maxRotation = desiredRotation * Quaternion.Euler(0f, 0f, -90f * extraRotationAllowance);
float overRotation = OverFlex(jointRotations[rawJointIndex], maxRotation);
extraRotationAllowance = Mathf.Max(extraRotationAllowance, overRotation);
if (overRotation < 0f)
{
jointRotations[rawJointIndex] = Quaternion.Slerp(
jointRotations[rawJointIndex],
maxRotation,
overrideFactor);
}
else if (jointCanSpread)
{
Quaternion trackedRotation = jointRotations[rawJointIndex];
float spreadAngle = Vector3.SignedAngle(
trackedRotation * Vector3.forward,
maxRotation * Vector3.forward,
trackedRotation * Vector3.up);
float spreadFactor = 1f - Mathf.Clamp01(overRotation * _spreadAllowance);
trackedRotation = trackedRotation * Quaternion.Euler(0f, spreadAngle * spreadFactor, 0f);
jointRotations[rawJointIndex] = trackedRotation;
}
}
float smoothFactor = _jointsFreedomLevels[i] == JointFreedom.Free ?
_jointUnlockProgressCurves[i].Progress()
: _jointLockProgressCurves[i].Progress();
jointRotations[rawJointIndex] = Quaternion.Slerp(
_constrainedJointRotations[i],
jointRotations[rawJointIndex],
smoothFactor);
_lastSyntheticRotation[i] = jointRotations[rawJointIndex];
}
}