void Character::FixedUpdate(float timeStep)
{
/// \todo Could cache the components for faster access instead of finding them each frame
RigidBody* body = GetComponent<RigidBody>();
AnimationController* animCtrl = GetComponent<AnimationController>();
// Update the in air timer. Reset if grounded
if (!onGround_)
inAirTimer_ += timeStep;
else
inAirTimer_ = 0.0f;
// When character has been in air less than 1/10 second, it's still interpreted as being on ground
bool softGrounded = inAirTimer_ < INAIR_THRESHOLD_TIME;
// Update movement & animation
const Quaternion& rot = node_->GetRotation();
Vector3 moveDir = Vector3::ZERO;
const Vector3& velocity = body->GetLinearVelocity();
// Velocity on the XZ plane
Vector3 planeVelocity(velocity.x_, 0.0f, velocity.z_);
if (controls_.IsDown(CTRL_FORWARD))
moveDir += Vector3::FORWARD;
if (controls_.IsDown(CTRL_BACK))
moveDir += Vector3::BACK;
if (controls_.IsDown(CTRL_LEFT))
moveDir += Vector3::LEFT;
if (controls_.IsDown(CTRL_RIGHT))
moveDir += Vector3::RIGHT;
// Normalize move vector so that diagonal strafing is not faster
if (moveDir.LengthSquared() > 0.0f)
moveDir.Normalize();
// If in air, allow control, but slower than when on ground
body->ApplyImpulse(rot * moveDir * (softGrounded ? MOVE_FORCE : INAIR_MOVE_FORCE));
if (softGrounded)
{
// When on ground, apply a braking force to limit maximum ground velocity
Vector3 brakeForce = -planeVelocity * BRAKE_FORCE;
body->ApplyImpulse(brakeForce);
// Jump. Must release jump control inbetween jumps
if (controls_.IsDown(CTRL_JUMP))
{
if (okToJump_)
{
body->ApplyImpulse(Vector3::UP * JUMP_FORCE);
okToJump_ = false;
}
}
else
okToJump_ = true;
}
// Play walk animation if moving on ground, otherwise fade it out
if (softGrounded && !moveDir.Equals(Vector3::ZERO))
animCtrl->PlayExclusive("Models/Jack_Walk.ani", 0, true, 0.2f);
else
animCtrl->Stop("Models/Jack_Walk.ani", 0.2f);
// Set walk animation speed proportional to velocity
animCtrl->SetSpeed("Models/Jack_Walk.ani", planeVelocity.Length() * 0.3f);
// Reset grounded flag for next frame
onGround_ = false;
}
