private void LateUpdate()
{
// Aim adjustments.
if (controller.Aiming)
{
// Calculate desired rotation.
Quaternion targetRotation = Quaternion.LookRotation(controller.personalTarget - spine.position);
// Apply parent bones initial rotation offsets
targetRotation *= Quaternion.Euler(initialRootRotation);
targetRotation *= Quaternion.Euler(initialHipsRotation);
targetRotation *= Quaternion.Euler(initialSpineRotation);
// Apply extra rotation offsets (depends on the NPC avatar).
targetRotation *= Quaternion.Euler(controller.classStats.aimOffset);
// Set rotation for the frame.
Quaternion frameRotation = Quaternion.Slerp(lastRotation, targetRotation, timeCountAim);
// Simulate a simple bone constraint on upper body rotation.
// Is spine rotation relative to the hips is less than 60 degrees?
if (Quaternion.Angle(frameRotation, hips.rotation) <= 60f)
{
// Set desired rotation.
spine.rotation = frameRotation;
timeCountAim += Time.deltaTime;
}
// Avoid unrealistic rotation, related to hips and spine.
else
{
// Deal with over twist stuck situation, due to async rotation of spine and hips.
if (timeCountAim == 0 && Quaternion.Angle(frameRotation, hips.rotation) > 70f)
{
// Stop aiming and aim again after body realignment (1 second interval).
StartCoroutine(controller.UnstuckAim(1f));
}
// No over twist, freeze spine rotation until the desired one is 60 degrees or less, relative to hips.
spine.rotation = lastRotation;
timeCountAim = 0;
}
// Grab rotation for next frame.
lastRotation = spine.rotation;
// Measure remain angle gap to desired aim orientation.
Vector3 target = controller.personalTarget - gunMuzzle.position;
Vector3 fwd = -gunMuzzle.right;
currentAimAngleGap = Vector3.Angle(target, fwd);
timeCountGuard = 0;
}
// Guard position adjustments.
else
{
lastRotation = spine.rotation;
// Slowly reduce aim offset when exiting aim position.
spine.rotation *= Quaternion.Slerp(Quaternion.Euler(controller.classStats.aimOffset), Quaternion.identity, timeCountGuard);
timeCountGuard += Time.deltaTime;
}
}