airplane collision detection problem

Question

hi their , i am doing a simple top-down view airplane game where u pilot a small airplane then u can land it on the airport , this is where i have the problem bcz the airplane is rigid body here is the scene settings:

1-a flat ground with a box collider(if over this it must crash)

2-a flat rectangle plane (Airport) with a box collider ,if over this it must not crash ever.

3-airplane that is controlled via physics that have box collider that prevents it from falling.

the problem : when landing hard (i want to damage it only) it crashes as if it is over the flat ground , because the colliders intersect with each other and pass each other for a split second.

note:the airport is over the flat ground.

Script:

 #pragma strict
 var hits : RaycastHit[];
 var airport : Collider;
 var ground : Collider;
 var height : float;
 
 var boomObject : GameObject;
 var airplaneObject : GameObject;
 var planeWreck : GameObject;
 
 var isLanded : boolean;
 
 
 function OnGUI(){
     if(isLanded == true){
         GUI.Box(Rect(Screen.width / 2 - 50 , 10 , 100 , 25),"Landed!");
     }
 }
 
 function FixedUpdate () {
     hits = Physics.RaycastAll (transform.position, -transform.up, 0.5);
     for( var hit : RaycastHit in hits ) {
         if(hit.collider == airport){
             height = transform.position.y - hit.point.y;  
             if( height <= 0.5){
                 isLanded = true;
                 return;
             }
         }
         if(hit.collider == ground){
             height = transform.position.y - hit.point.y;
             if( height <= 0.5){
                 Instantiate(boomObject, transform.position, transform.rotation);
                 Instantiate(planeWreck, transform.position, airplaneObject.transform.rotation);
                 Destroy(airplaneObject);
                 Destroy(GetComponent(PlaneControl));
                 return;
             }
         }
     }
 }

please advice and thanks for any help i can get.

Answer 1

ok i have fixed it somehow (work around) , by adding a small timer to the crash script:

 #pragma strict
 var hits : RaycastHit[];
 var airport : Collider;
 var ground : Collider;
 var height : float;
 
 var boomObject : GameObject;
 var airplaneObject : GameObject;
 var planeWreck : GameObject;
 
 var isLanded : boolean;
 
 var timeToCrash : float;
 var startTimeToCrash : float;
 
 function Start(){
     timeToCrash = startTimeToCrash;
 }
 
 function OnGUI(){
     if(isLanded == true){
         GUI.Box(Rect(Screen.width / 2 - 50 , 10 , 100 , 25),"Landed!");
     }
 }
 
 function FixedUpdate () {
     hits = Physics.RaycastAll (transform.position, -transform.up, 0.5);
     for( var hit : RaycastHit in hits ) {
         if(hit.collider == airport){
             height = transform.position.y - hit.point.y;  
             if( height <= 0.5){
                 isLanded = true;
                 return;
             }
         }
         if(hit.collider == ground){
             height = transform.position.y - hit.point.y;
             if( height <= 0.5){
                 isLanded = false;
                 TimetoCrash();
                 
                 //return;
             }
         }
     }
 }
 
 function TimetoCrash(){
     timeToCrash = timeToCrash - 0.01;
     
     if(isLanded == true){
         timeToCrash = startTimeToCrash;
     }
     
     if(timeToCrash <= 0){
         Instantiate(boomObject, transform.position, transform.rotation);
         Instantiate(planeWreck, transform.position, airplaneObject.transform.rotation);
         Destroy(airplaneObject);
         Destroy(GetComponent(PlaneControl));
         timeToCrash = startTimeToCrash;
     }
 }

i have set the (startTimeToCrash) to 0.1;

i know its kind of hackish way to do it but it did it for me.

if there is any better solution for it i wish somebody post it plz, thx.

airplane collision detection problem

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