void FixedUpdate()
{
RotateArm();
PreviousTargetDistance = Vector3.Distance(ShoulderJoint.position, TargetPoint.position);
PreviousWristDistance = Vector3.Distance(ShoulderJoint.position, WristJoint.position);
RaycastHit Hit;
DirectionVector = (LookPoint.position - ShoulderJoint.position).normalized;
if (Physics.Raycast(ShoulderJoint.position, DirectionVector, out Hit, MaxHitDistance))
{
ArmIKTarget IKTarget = new ArmIKTarget();
IKTarget.Location = Hit.point;
IKTarget.Distance = Hit.distance;
IKTarget.Normal = Hit.normal;
IKTarget.IsTouching = true;
PositionIK(IKTarget);
}
else
{
ReturnToRest();
}
PreviousDistance = Vector3.Distance(ShoulderJoint.position, TargetPoint.position);
}
private Vector3 GetWristTarget(ArmIKTarget IKTarget)
{
Vector3 WristTarget;
if (IKTarget.Distance > UALength + LALength - AntiJointLockAmount)
{
// This is the case scenario where the hand is touching something, but only slightly.
Vector3 HandForwardVector = (FingerTip.position - WristJoint.position).normalized;
if (IKTarget.Distance < UALength + LALength + WCLength - AntiJointLockAmount)
{
// This sub-case describes a situation where the hand is able to clasp something.
//WristTarget = IKTarget.Location - DirectionVector * WCLength;
WristTarget = IKTarget.Location - HandForwardVector * WCLength;
}
else
{
// This sub-case describes a sitation where the hand is just barely touching something. (Think finger-tips.)
//WristTarget = IKTarget.Location - DirectionVector * HandLength;
WristTarget = IKTarget.Location - HandForwardVector * HandLength;
}
}
else
{
// This is the case scenario where the hand will be completely pressed up against the object.
WristTarget = IKTarget.Location - DirectionVector * HandThickness;
WristTarget -= Vector3.down * WCLength;
}
return WristTarget;
}
private Vector3 GetWristTarget(ArmIKTarget IKTarget)
{
Vector3 WristTarget;
if (IKTarget.Distance > UALength + LALength - AntiJointLockAmount)
{
// This is the case scenario where the hand is touching something, but only slightly.
Vector3 HandForwardVector = (FingerTip.position - WristJoint.position).normalized;
if (IKTarget.Distance < UALength + LALength + WCLength - AntiJointLockAmount)
{
// This sub-case describes a situation where the hand is able to clasp something.
//WristTarget = IKTarget.Location - DirectionVector * WCLength;
WristTarget = IKTarget.Location - HandForwardVector * WCLength;
}
else
{
// This sub-case describes a sitation where the hand is just barely touching something. (Think finger-tips.)
//WristTarget = IKTarget.Location - DirectionVector * HandLength;
WristTarget = IKTarget.Location - HandForwardVector * HandLength;
}
}
else
{
// This is the case scenario where the hand will be completely pressed up against the object.
WristTarget = IKTarget.Location - DirectionVector * HandThickness;
WristTarget -= Vector3.down * WCLength;
}
return(WristTarget);
}
private float WCLength; // wrist -> clasp distance
#endregion Fields
#region Methods
void FixedUpdate()
{
RotateArm();
PreviousTargetDistance = Vector3.Distance(ShoulderJoint.position, TargetPoint.position);
PreviousWristDistance = Vector3.Distance(ShoulderJoint.position, WristJoint.position);
RaycastHit Hit;
DirectionVector = (LookPoint.position - ShoulderJoint.position).normalized;
if (Physics.Raycast(ShoulderJoint.position, DirectionVector, out Hit, MaxHitDistance))
{
ArmIKTarget IKTarget = new ArmIKTarget();
IKTarget.Location = Hit.point;
IKTarget.Distance = Hit.distance;
IKTarget.Normal = Hit.normal;
IKTarget.IsTouching = true;
PositionIK(IKTarget);
}
else
{
ReturnToRest();
}
PreviousDistance = Vector3.Distance(ShoulderJoint.position, TargetPoint.position);
}
private void ReturnToRest()
{
ArmIKTarget IKTarget = new ArmIKTarget();
IKTarget.Distance = Mathf.Min(MaxHitDistance, PreviousDistance + Time.fixedDeltaTime * MaxReturnLerpSpeed);
IKTarget.Location = ShoulderJoint.position + DirectionVector * IKTarget.Distance;
PositionIK(IKTarget);
}
private void RotateWrist(ArmIKTarget IKTarget)
{
/*if (IKTarget.IsTouching)
* {
* Vector3 WristToHand = (FingerTip.position - WristJoint.position).normalized;
* Vector3 HandUpVector = Vector3.Cross(WristJoint.TransformDirection(Vector3.right), WristToHand);
* Quaternion RotationDifference = Quaternion.FromToRotation(HandUpVector, IKTarget.Normal);
* //WristToHand = RotationDifference * WristToHand;
* WristJoint.rotation = RotationDifference;
* }
* else
* {
* Vector3 NewWristRotation = Vector3.Lerp(WristJoint.localEulerAngles, BaseWristRotation, Time.fixedDeltaTime * MaxReturnLerpSpeed);
* WristJoint.localRotation = Quaternion.Euler(NewWristRotation);
* }*/
}
private void PositionIK(ArmIKTarget IKTarget)
{
TargetPoint.position = IKTarget.Location;
Vector3 WristTarget = GetWristTarget(IKTarget);
/****************************Elbow Handling****************************/
float a = UALength;
float b = LALength;
float c = Vector3.Distance(ShoulderJoint.position, WristTarget);
c = Mathf.Clamp(c, Mathf.Abs(a - b) + 0.01f, UALength + LALength - 0.01f);
c = Mathf.Clamp(c, PreviousWristDistance - MaxDistanceChangeSpeed * Time.fixedDeltaTime, PreviousWristDistance + MaxDistanceChangeSpeed * Time.fixedDeltaTime);
// Law of Cosines for determining the angle of a joint with 3 known sides:
// Arccos((AdjSideA^2 + AdjSideB^2 - OppSideC^2) / (2*AdjSideA*AdjSideB))
float ElbowAngle = Mathf.Acos((a * a + b * b - c * c) / (2 * a * b)) * (180f / 3.1415f);
ElbowAngle = (a * a + b * b - c * c);
ElbowAngle = ElbowAngle / (2 * a * b);
ElbowAngle = Mathf.Acos(ElbowAngle);
ElbowAngle = ElbowAngle * (180 / Mathf.PI);
Vector3 NewElbowRotation = BaseElbowRotation;
float ElbowBend = 180 - ElbowAngle;
if (ElbowBend > ElbowMinBend && ElbowBend < ElbowMaxBend)
{
//Debug.Log("Positive");
//Debug.Log("C Value: " + c);
//ElbowBend = Mathf.Clamp(ElbowBend, PreviousAngle - MaxDistanceChangeSpeed*Time.fixedDeltaTime, PreviousAngle + MaxDistanceChangeSpeed*Time.fixedDeltaTime);
NewElbowRotation.z = ElbowBend;
PreviousAngle = ElbowBend;
}
else if (-ElbowBend > ElbowMinBend && -ElbowBend < ElbowMaxBend)
{
//Debug.Log("Negative");
//Debug.Log("C Value: " + c);
//ElbowBend = Mathf.Clamp(ElbowBend, PreviousAngle - MaxDistanceChangeSpeed * Time.fixedDeltaTime, PreviousAngle + MaxDistanceChangeSpeed * Time.fixedDeltaTime);
NewElbowRotation.z = -ElbowBend;
PreviousAngle = ElbowBend;
}
else
{
//Debug.Log("Neither");
//Debug.Log("C Value: " + c);
NewElbowRotation.z = ElbowMinBend;
PreviousAngle = ElbowBend;
}
try
{
ElbowJoint.localRotation = Quaternion.Euler(NewElbowRotation);
}
catch { }
/***************************Shoulder Handling***************************/
// a is already correct
b = c;
c = LALength;
float ShoulderAngle = Mathf.Acos((a * a + b * b - c * c) / (2 * a * b)) * (180f / Mathf.PI);
//Debug.Log("Shoulder Angle: " + ShoulderAngle);
Vector3 NewShoulderRotation = BaseShoulderRotation;
float ShoulderBend = 180f - ShoulderAngle;
NewShoulderRotation.z = 180f + ShoulderBend;
ShoulderJoint.localRotation = Quaternion.Euler(NewShoulderRotation);
}
private void RotateWrist(ArmIKTarget IKTarget)
{
/*if (IKTarget.IsTouching)
{
Vector3 WristToHand = (FingerTip.position - WristJoint.position).normalized;
Vector3 HandUpVector = Vector3.Cross(WristJoint.TransformDirection(Vector3.right), WristToHand);
Quaternion RotationDifference = Quaternion.FromToRotation(HandUpVector, IKTarget.Normal);
//WristToHand = RotationDifference * WristToHand;
WristJoint.rotation = RotationDifference;
}
else
{
Vector3 NewWristRotation = Vector3.Lerp(WristJoint.localEulerAngles, BaseWristRotation, Time.fixedDeltaTime * MaxReturnLerpSpeed);
WristJoint.localRotation = Quaternion.Euler(NewWristRotation);
}*/
}
private void ReturnToRest()
{
ArmIKTarget IKTarget = new ArmIKTarget();
IKTarget.Distance = Mathf.Min(MaxHitDistance, PreviousDistance + Time.fixedDeltaTime * MaxReturnLerpSpeed);
IKTarget.Location = ShoulderJoint.position + DirectionVector * IKTarget.Distance;
PositionIK(IKTarget);
}
private void PositionIK(ArmIKTarget IKTarget)
{
TargetPoint.position = IKTarget.Location;
Vector3 WristTarget = GetWristTarget(IKTarget);
/****************************Elbow Handling****************************/
float a = UALength;
float b = LALength;
float c = Vector3.Distance(ShoulderJoint.position, WristTarget);
c = Mathf.Clamp(c, Mathf.Abs(a - b) + 0.01f, UALength + LALength - 0.01f);
c = Mathf.Clamp(c, PreviousWristDistance - MaxDistanceChangeSpeed * Time.fixedDeltaTime, PreviousWristDistance + MaxDistanceChangeSpeed * Time.fixedDeltaTime);
// Law of Cosines for determining the angle of a joint with 3 known sides:
// Arccos((AdjSideA^2 + AdjSideB^2 - OppSideC^2) / (2*AdjSideA*AdjSideB))
float ElbowAngle = Mathf.Acos((a*a + b*b - c*c) / (2*a*b)) * (180f / 3.1415f);
ElbowAngle = (a*a + b*b - c*c);
ElbowAngle = ElbowAngle / (2*a*b);
ElbowAngle = Mathf.Acos(ElbowAngle);
ElbowAngle = ElbowAngle * (180 / Mathf.PI);
Vector3 NewElbowRotation = BaseElbowRotation;
float ElbowBend = 180 - ElbowAngle;
if (ElbowBend > ElbowMinBend && ElbowBend < ElbowMaxBend)
{
//Debug.Log("Positive");
//Debug.Log("C Value: " + c);
//ElbowBend = Mathf.Clamp(ElbowBend, PreviousAngle - MaxDistanceChangeSpeed*Time.fixedDeltaTime, PreviousAngle + MaxDistanceChangeSpeed*Time.fixedDeltaTime);
NewElbowRotation.z = ElbowBend;
PreviousAngle = ElbowBend;
}
else if (-ElbowBend > ElbowMinBend && -ElbowBend < ElbowMaxBend)
{
//Debug.Log("Negative");
//Debug.Log("C Value: " + c);
//ElbowBend = Mathf.Clamp(ElbowBend, PreviousAngle - MaxDistanceChangeSpeed * Time.fixedDeltaTime, PreviousAngle + MaxDistanceChangeSpeed * Time.fixedDeltaTime);
NewElbowRotation.z = -ElbowBend;
PreviousAngle = ElbowBend;
}
else
{
//Debug.Log("Neither");
//Debug.Log("C Value: " + c);
NewElbowRotation.z = ElbowMinBend;
PreviousAngle = ElbowBend;
}
try
{
ElbowJoint.localRotation = Quaternion.Euler(NewElbowRotation);
}
catch { }
/***************************Shoulder Handling***************************/
// a is already correct
b = c;
c = LALength;
float ShoulderAngle = Mathf.Acos((a*a + b*b - c*c) / (2*a*b)) * (180f / Mathf.PI);
//Debug.Log("Shoulder Angle: " + ShoulderAngle);
Vector3 NewShoulderRotation = BaseShoulderRotation;
float ShoulderBend = 180f - ShoulderAngle;
NewShoulderRotation.z = 180f + ShoulderBend;
ShoulderJoint.localRotation = Quaternion.Euler(NewShoulderRotation);
}