simple flight implementation - helicopter

hey

i'm trying to implement an easy flight mode for my object (2d).
all i wan't is for my object to lift up until a certain height and then stay there.
(afterwards to move in x direction. kind of like a helicopter would do)

how would i manage to do such thing?
here is what i tryed:

PHP:

    function Fly() {
        
        var obj = gameObject.FindWithTag( "myObject" );
        var height = obj.transform.position.y;
        
        if( height <= 2 ) {
            var force = ( Vector3.up * 100 * 15 );
            obj.rigidbody.AddRelativeForce( force );
        }
    }


the thing is, that does not work properly. (at the moment it bounces up and down and does not stay at a certain height)

does somebody have a hint?

thx
cheers

 

try using a force that increases as height decreases. Limit that force to a maximum value (mathf.clamp) or use another non-linear direct relationship (still clamped if you want it to be remotely realistic) to make it more floaty.

 

As much as I love using Physics for everything. In this case I would suggest using math for the whole thing. You would need a variables to handle position, rotation and momentum. Past that it is just the calculation that when you press certain keys (or axis) then it controls how the chopper flys.

I would also put all of your code on the chopper, not in something that finds the chopper.

 

Make sure you are calling this function from FixedUpdate.

 

I'm interested by the solution, i'm working on a similar feature

Dear Paco, could you show the inspector panel of your character ?

It will be helpful for a newbie like me

 

here's the code i've got so far.
(it's a little bit better but still not the end solution)

you should be able to attach this code to every unity gameobject with a a rigid body component
to test it.

PHP:

var bfly : boolean;

function Awake() {
    bfly = true;
}

function FixedUpdate() {
    if( bfly ) {
        doFly();
    }
}

function setFly( val : boolean ) {
    this.bfly = val;
}

function doFly() {
    
    var height = transform.position.y;
    var val;
    var force;
    
    if( height <= 2 ) {
        var min = rigidbody.mass * Mathf.Round( Mathf.Abs( Physics.gravity.y ) );
        var max = min + 10;
        val = Mathf.Clamp( 0, min, max );
        Debug.Log( val + " " + Time.time );
        force = ( Vector3.up * val );
        rigidbody.AddRelativeForce( force );
    }
    
    if( height >= 1.85 ) {
        val = Mathf.Clamp( 0, 50, 300 );
        force = ( Vector3.right * val );
        rigidbody.AddRelativeForce( force );
    }
}



 

well it's a dirty hack, but it get's the job done.
i simply modify the velocity "by hand" after a given height.

PHP:

var minforce : float;
var maxforce : float;

var bfly : boolean;
var bliftoff : boolean;
var bUp : boolean;

function Awake() {
    bfly = false;
    bliftoff = false;
    bUp = false;
    minforce = rigidbody.mass * Mathf.Round( Mathf.Abs( Physics.gravity.y ) ) - 0.95;
    maxforce = minforce + 1;
}

function Start() {
    bliftoff = true;
}

function FixedUpdate() {
    if( bliftoff ) 
        doLiftOff();
    if( bfly )
        doFly();
}

function doLiftOff() {
    
    var val;
    var force;
    var height = transform.position.y;
    
    if( height <= -1 ) {
        val = maxforce;
        force = ( Vector3.up * val );
        rigidbody.AddRelativeForce( force );
    }
    else {
        rigidbody.velocity = Vector3( 0, 0, 0 );
        bfly = true;
        bliftoff = false;
    }
}

function doFly() {
    
    var val1;
    var val2;
    var force;
    
    val1 = 300;
    val2 = minforce;
    force = ( Vector3.right * val1 ) + ( Vector3.up * val2 );
    rigidbody.AddRelativeForce( force );
}



 

Arf, my character is Lerpz. He's got not rigidbody but character controller

However, i'll try to adapt your solution to mine