void Movement()
{
rigidBody.AddForce(Vector3.down * DownForce * Time.deltaTime); // keep player on the ground.
PlayerJump.HandleJumping(rigidBody);
Vector3 forward = camera.transform.forward;
Vector3 right = camera.transform.right;
rigidBody.AddForce(forward * PlayerInput.verticalMovement * MovementSpeed * Time.deltaTime * PlayerInput.movementMultiplier);
rigidBody.AddForce(right * PlayerInput.horizontalMovement * MovementSpeed * Time.deltaTime * PlayerInput.movementMultiplier);
}