// Calculates the hand position
Vector3 GetHandPosition(int index)
{
var isLeft = (index == 0);
// Relative position of the hand.
var pos = _handPosition;
if (isLeft)
{
pos.x *= -1;
}
// Apply the body (hip) transform.
pos = _animator.bodyRotation * pos + _animator.bodyPosition;
// Add noise.
pos += Vector3.Scale(Noise.Float3(_noise, (uint)(4 + index)), _handPositionNoise);
// Clamping in the local space of the chest bone.
pos = _chestMatrixInv * new Vector4(pos.x, pos.y, pos.z, 1);
pos.y = Mathf.Max(pos.y, 0.2f);
pos.z = isLeft ? Mathf.Max(pos.z, 0.2f) : Mathf.Min(pos.z, -0.2f);
pos = _chestMatrix * new Vector4(pos.x, pos.y, pos.z, 1);
return(pos);
}
// Spine (spine/chest/upper chest) rotation
quaternion GetSpineRotation()
{
// Constant bending
var r1 = quaternion.RotateX(deg2rad(_spineBend));
// Noise
var r2 = Noise.Rotation(_noise, deg2rad(_spineRotationNoise), 1);
return(math.mul(r1, r2));
}
// Look at position (for head movement)
float3 GetLookAtPosition()
{
// Z plane constraint noise
var pos = Noise.Float3(_noise, 6) * _headMove;
pos.z = 2;
// Body transform
pos = math.mul(_animator.bodyRotation, pos);
pos += (float3)_animator.bodyPosition;
return(pos);
}
// Hand positions
float3 GetHandPosition(Side side)
{
// Relative position
var pos = (float3)_handPosition;
if (side == Side.Left)
{
pos.x *= -1;
}
// Noise
pos += Noise.Float3(_noise, 2 + (uint)side) * _handPositionNoise;
// Chest transform
pos = math.mul(_chestMatrix, math.float4(pos, 1)).xyz;
return(pos);
}
// Body (hip) rotation
quaternion GetBodyRotation()
{
// Base offset
var r1 = quaternion.RotateY(-math.PI / 2);
// Right direction vector based on the foot positions
var right = RightFootPosition - LeftFootPosition;
right.y = 0;
right = math.normalize(right);
// Horizontal rotation
var r2 = quaternion.LookRotation(right, Up);
// Noise
var r3 = Noise.Rotation(_noise, deg2rad(_hipRotationNoise), 0);
return(math.mul(math.mul(r1, r2), r3));
}
// Finger rotations
quaternion GetFingerRotation(Side side)
=> quaternion.Euler
(Noise.Float3(_noise, 4 + (uint)side)
* math.float3(0.7f, 0.3f, 0.3f) + math.float3(0.35f, 0, 0));
