Moving Objects in Unity
Unity : How to move a GameObject in 3D space?
There are different ways to move an object within 3D space with code. Here we go over 5 options:
B) transform.Translate
Similar to transform.position, but instead of assigning the GameObject a new position, it gives the GameObject an amount to move, data contained in a Vector3 struct.
private void Update()
{
transform.Translate(Vector3.forward * Time.deltaTime);
}
C) RigidBody.AddForce
RigidBody: Adding a Rigidbody component to a GameObject will put its motion under the control of Unity's physics engine, which is a long list of physical properties such as acceleration, mass, gravity, inertia, etc, as well as the capacity to react to other rigid bodies (for instance, collide).
RigidBody.AddForce: Adds a force vector to the class Rigidbody. Force can be applied only to an active Rigidbody. If a GameObject is inactive, AddForce has no effect. Specifying the ForceMode mode allows the type of force to be changed to an Acceleration, Impulse or Velocity Change.
public class RigidBodyAddForce : MonoBehaviour
{
public float forceMult = 200; //velocity float multiplier
private Rigidbody rb; //declarate Class Rigidbody
private void Awake()
{
rb = GetComponent<Rigidbody>();
}
private void Update()
{
rb.AddForce(transform.up * forceMult * Time.deltaTime);
}
}
- The effect of the float forceMult (multiplier) over the RigidBody’s velocity is acceleration, it´s adding force every frame. A divider would be deceleration (transform.up / forceDiv).
- GameObject is activated in private void Awake();
- transform.up is the unit vector defined by (0, 0, 1).
D) RigidBody.MovePosition
Similar to transform.position but applied to a RigidBody, it sets the new position of the GameObject. Recommended to use with kinematic rigid bodies. When a RigidBody is marked as Kinematic, it will not be affected by collisions, forces, or any other part of Unity´s phisics engine.
public class RigidBodyMovePosition : MonoBehaviour
{
public float forceMult = 100;
private Rigidbody rb;
private void Awake()
{
rb = GetComponent<Rigidbody>();
}
private void Update()
{
rb.MovePosition(transform.position + (transform.forward * Time.deltaTime));
}
}
E) RigidBody.Velocity
The velocity vector of the rigidbody. It represents the rate of change of the Rigidbody position.
public class RigidBodySetVelocity : MonoBehaviour
{
public float forceMult = 200;
private Rigidbody rb;
private void Awake()
{
rb = GetComponent<Rigidbody>();
}
// Update is called once per frame
private void Update()
{
rb.velocity = transform.forward * Time.deltaTime * forceMult;
}