//Apply friction to both vertical and horizontal momentum based on 'friction' and 'gravity';
//Handle sliding down steep slopes;
private void HandleMomentum()
{
//If local momentum is used, transform momentum into world coordinates first;
if (useLocalMomentum)
{
momentum = tr.localToWorldMatrix * momentum;
}
Vector3 _verticalMomentum = Vector3.zero;
Vector3 _horizontalMomentum = Vector3.zero;
//Split momentum into vertical and horizontal components;
if (momentum != Vector3.zero)
{
_verticalMomentum = VectorMath.ExtractDotVector(momentum, tr.up);
_horizontalMomentum = momentum - _verticalMomentum;
}
//Add gravity to vertical momentum;
_verticalMomentum -= tr.up * gravity * Time.deltaTime;
//Remove any downward force if the controller is grounded;
if (currentControllerState == ControllerState.Grounded)
{
_verticalMomentum = Vector3.zero;
}
//Apply friction to horizontal momentum based on whether the controller is grounded;
if (currentControllerState == ControllerState.Grounded)
{
_horizontalMomentum = VectorMath.IncrementVectorTowardTargetVector(_horizontalMomentum, groundFriction, Time.deltaTime, Vector3.zero);
}
else
{
_horizontalMomentum = VectorMath.IncrementVectorTowardTargetVector(_horizontalMomentum, airFriction, Time.deltaTime, Vector3.zero);
}
//Add horizontal and vertical momentum back together;
momentum = _horizontalMomentum + _verticalMomentum;
//Project the current momentum onto the current ground normal if the controller is sliding down a slope;
if (currentControllerState == ControllerState.Sliding)
{
momentum = Vector3.ProjectOnPlane(momentum, mover.GetGroundNormal());
}
//Apply slide gravity along ground normal, if controller is sliding;
if (currentControllerState == ControllerState.Sliding)
{
Vector3 _slideDirection = Vector3.ProjectOnPlane(-tr.up, mover.GetGroundNormal()).normalized;
momentum += _slideDirection * slideGravity * Time.deltaTime;
}
//If controller is jumping, override vertical velocity with jumpSpeed;
if (currentControllerState == ControllerState.Jumping)
{
momentum = VectorMath.RemoveDotVector(momentum, tr.up);
momentum += tr.up * jumpSpeed;
}
if (useLocalMomentum)
{
momentum = tr.worldToLocalMatrix * momentum;
}
}
//Determine current controller state based on current momentum and whether the controller is grounded (or not);
//Handle state transitions;
private ControllerState DetermineControllerState()
{
//Check if vertical momentum is pointing upwards;
bool _isRising = IsRisingOrFalling() && (VectorMath.GetDotProduct(GetMomentum(), tr.up) > 0f);
//Check if controller is sliding;
bool _isSliding = mover.IsGrounded() && IsGroundTooSteep();
//Grounded;
if (currentControllerState == ControllerState.Grounded)
{
if (_isRising)
{
OnGroundContactLost();
return(ControllerState.Rising);
}
if (!mover.IsGrounded())
{
OnGroundContactLost();
return(ControllerState.Falling);
}
if (_isSliding)
{
return(ControllerState.Sliding);
}
return(ControllerState.Grounded);
}
//Falling;
if (currentControllerState == ControllerState.Falling)
{
if (_isRising)
{
return(ControllerState.Rising);
}
if (mover.IsGrounded() && !_isSliding)
{
OnGroundContactRegained(momentum);
return(ControllerState.Grounded);
}
if (_isSliding)
{
OnGroundContactRegained(momentum);
return(ControllerState.Sliding);
}
return(ControllerState.Falling);
}
//Sliding;
if (currentControllerState == ControllerState.Sliding)
{
if (_isRising)
{
OnGroundContactLost();
return(ControllerState.Rising);
}
if (!mover.IsGrounded())
{
return(ControllerState.Falling);
}
if (mover.IsGrounded() && !_isSliding)
{
OnGroundContactRegained(momentum);
return(ControllerState.Grounded);
}
return(ControllerState.Sliding);
}
//Rising;
if (currentControllerState == ControllerState.Rising)
{
if (!_isRising)
{
if (mover.IsGrounded() && !_isSliding)
{
OnGroundContactRegained(momentum);
return(ControllerState.Grounded);
}
if (_isSliding)
{
return(ControllerState.Sliding);
}
if (!mover.IsGrounded())
{
return(ControllerState.Falling);
}
}
//If a ceiling detector has been attached to this gameobject, check for ceiling hits;
if (ceilingDetector != null)
{
if (ceilingDetector.HitCeiling())
{
OnCeilingContact();
return(ControllerState.Falling);
}
}
return(ControllerState.Rising);
}
//Jumping;
if (currentControllerState == ControllerState.Jumping)
{
//Check for jump timeout;
if ((Time.time - currentJumpStartTime) > jumpDuration)
{
return(ControllerState.Rising);
}
//Check if jump key was let go;
if (jumpKeyWasLetGo)
{
return(ControllerState.Rising);
}
//If a ceiling detector has been attached to this gameobject, check for ceiling hits;
if (ceilingDetector != null)
{
if (ceilingDetector.HitCeiling())
{
OnCeilingContact();
return(ControllerState.Falling);
}
}
return(ControllerState.Jumping);
}
return(ControllerState.Falling);
}
