lerp too fast

Hello,

I am using lerp to interpolate between two positions. The interpolation should be finished after 10 seconds, but it reaches the final position after about 1.6 seconds. I can' t figure out, what I am doing wrong.

Any hints?

Code (csharp):

1.  
2. private var m_currentTime=0.0;
3. private var m_timeToMove = 10.0;
4. private var m_newPosition : Vector3;
5.  
6. function Start() {
7.  
8.     while (m_currentTime < m_timeToMove){
9.         m_currentTime += Time.deltaTime;
10.    
11.         transform.localPosition = Vector3.Lerp (transform.localPosition,m_newPosition, m_currentTime
12. /m_timeToMove);
13.    
14.         print (" pos: " + transform.localPosition + " t: " + m_currentTime/m_timeToMove );
15.    
16.         yield;
17.     }
18.  
19.  
20. }
21. function SetPosition(l_position){
22. m_newPosition = l_position;
23. }
24.  

 

It's because you're continuously changing transform.localPosition each frame and using that as the first parameter in Lerp. You'd want to declare a "startPos = transform.position" variable before the loop, and use startPos instead of transform.position in the Lerp. (It's likely you actually meant transform.position rather than transform.localPosition.)

--Eric

 

Eric

thanks; with use of startPos, it is running correct.

I am using localPosition because I would like to change the position relativ to the parent. Should be ok?

 

Yes, that's fine. I see localPosition used incorrectly sometimes, but not in this case it seems.

--Eric

 

Yup, that was it. Thanks

 

This comment helped me in 2019 ! thx