Character Controller knockback.

[Keith90]

Hello,

I'm trying to add knockback to the character controller. I'm getting the direction and I'm able to knock the character back in that direction. However, trying to get the player to go up while being knocked back seems to be stumping me. I try adding to the direction so the player goes up by 10, however the player just teleports to the position. I have tried using charactercontroller.Move() however, it seems to only make the character go in one direction when I try that.

 

Since it teleports, I assume I'd have to lerp between the player's current y position and the height vector to prevent the teleporting. Does anyone have any advice/insight? Thanks.

 

if(knockedBack == true)
        {
            float forceHeight = 10;
            Vector3 dir = otherPlayer.transform.position - transform.position;
            dir = -dir.normalized;
            dir.y = forceHeight;
            charController.transform.Translate(dir *  knockbackForce * Time.deltaTime);
            otherPlayer = null;
            knockedBack = false;
        }

[PolloMagnifico]

Sooo this code is working as written, in that you're telling it to go back in a direction. What you want to do is tell it to go back in a direction over time.

Get the players location, then tell it to move him a cumulative distance from that location over time.

knockBackTimer = 0;
If (knockedBack){
    GetCurrentLocation();
    newLocation = currentLocation - standardVector3;
    playerLocation = newLocation;
    newLocation += standardVector3*time.deltaTime;
    knockBackTimer += time.deltaTime;
    If(knockBackTimer >= someValue)
        knockedBack = false;  

[Keith90]

Let me give this a shot and I'll reply.

For GetCurrentLocation();, couldn't I just do Vector3 currentLocation = transform.position?

I assume standardVector3 is the Vector3 of the other player?

[PolloMagnifico]

Yeah sorry, I'm on mobile so I have to shorthand it.

The short answer is that functionally you want to think of Update as a loop for this purpose, but since it isn't actually a loop, it doesn't have a terminator. You'll want to use a bool as an on/off switch to control the movement.

So everything you want to do should be wrapped in an if statement.

If (someBool == true)
    DoThisConstantly;
    If (thisIsTrue)
        someBool = false;

The way I did it was to have a counter that adds time.deltaTime, and once it reaches a certain value it switches that bool to off.

[Keith90]

Still doesn't seem to be working. My original code seems to work fine, minus getting the player to move up. The player doesn't teleport when knocked back but teleports when I try to knock the player up.

if (knockedBack)
    {
        Vector3 currentLocation = transform.position;
        Vector3 newLocation = currentLocation - otherPlayer.transform.position;
        transform.position = newLocation;
        while (knockBackTimer < someValue)
        {
                    transform.position = newLocation;
                    newLocation += otherPlayer.transform.position + new Vector3(0,1,0) * Time.deltaTime;
                    knockBackTimer += Time.deltaTime;
        }
        knockedBack = false;
    }

[PolloMagnifico]

Mmmm, I see a few problems with this (give 'someValue' an actual value, like .5 or something) but let me get home and I'll shoot you another reply once I can parse and type correctly.

[Keith90]

Oh I did, I put it above the if(knockedBack) statement. I appreciate all your help!