Moving object without AddForce

I have calculated and rotated an object to face the desired direction of travel and want to propel it directly in the direction it is facing...

I understand if I give the object a rigid body that I can go about this by means of AddForce, or AddRelativeForce.. But really I would rather manipulate the object by means of Transform...

What is the best way of doing this...

Thanks...

Here is the code I have...

Code (csharp):

1.  
2. using UnityEngine;
3. using System.Collections;
4. public class V2MovePlayerToRabbit : MonoBehaviour {
5.  public Transform HomeRabbit4; // Linking this game object to the rabbit position
6.  private float Diffx;
7.  private float Diffz;
8.  private float MoveDirection;
9.  // Update is called once per frame
10.  void Update () {
11.  // Diffx and z are variables required to calculate desired angle
12.  Diffx = gameObject.transform.position.x - HomeRabbit4.position.x;
13.  Diffz = gameObject.transform.position.z - HomeRabbit4.position.z;
14.  //Calculate the desired taget angle
15.  MoveDirection = Mathf.Atan2 (Diffx, Diffz) * 180 / Mathf.PI;
16.  print ("Move Direction = " + MoveDirection + "degrees");
17.  
18.  // Set the player facing it's intended target
19.  transform.Rotate (0, MoveDirection, 0);
20.  
21.  // Now the player is facing its intended target we must
22.  // add a force along the "FORWARD" axis relative to the new rotation...
23.  // We can limit the speed this object is allowed to transform at directly with a variable ie "MAX SPEED"
24.  // We also need to factor in Time.deltaTime so this calculation is not affected by current Frame-rate
25.  
26.  
27.  }
28.  
29. }
30. [code/]
31.  
32. Thanks

 

Haha! Well, I now also see that I am in fact adding that rotation every frame, thus achieving the spinning spiral of AI Doh!

I have sussed the transform.Translate (1, 0, 0 * Time.Deltatime) to get it moving... Only now I need to find a way of making that rotation figure correct :/

 

You might want to just use transform.LookAt.
You'll want to move your target to the same Y if you don't want any tilting.

 

wouldn't the principal be the same? Just add (transform.forward*velocity*time.delta)?

edit - more specifically, I think you'd want something like (targetpos-sourcepos).normalize*velocity*time.delta

 

Thanks you for the advices...

I researched and found .LookAt late last night... It effectively does the calculation for me... Thus turning a 20 line code into 2...!

First thing I noticed was the transform slowly pushing my object through the floor... Tilting Solved that issue by ensuring the Rabbit (Target) has the same Y plane...

I would like to know if the 'LookAt' function is more or less costly than what I initially coded.. It seems when calling such function (They look so easy!) But behind the scenes the UNITY engine is doing the hard work, just it cant be seen!

I also have read that using any '.position' is really bad for performance as effectively the unity engine IS doing a GetComponent.Transform.position without you seeing it - Is this really the case?

Also I have been made aware of using a cache for these situations, although I don't yet fully understand!

Thanks again for the support

Peace...