Randomly Generated Objects inside an area

Question

I need a code to spawn in multiple objects in specified area when the scene is first loaded. I'm trying to make a island resource survival game kinda like the game "Stranded" or "Stranded 2", And I need to spawn in t$$anonymous$$ngs like trees/rocks in a certain part of the island, but still at random spots with a random number of t$$anonymous$$ngs. If you do submit a script, I would like you to please explain what everyt$$anonymous$$ng means and what everyt$$anonymous$$ng does so I can change t$$anonymous$$ngs if need be, If that wouldn't be that hard for you guys? I haven't messed with t$$anonymous$$ngs like t$$anonymous$$s before, and I want to learn what I'm doing. any help would be much appreciated.

Answer 1

Answer by erick_weil · Feb 18, 2014 at 12:22 AM

try by creating a function and calling then in start()

make a area Vector3 paramater and a GameObject for the Instance.

 function generateisland(NumObjects : int,wichobject : GameObject,area : Vector3)
 {
 .
 .
 .

iniciate using a loop to create as many objects that you want of that type.

 for(var i=0;i<NumObjects;i++)
 {
 .
 .
 .

now make a Random posi to Instantiate t$$anonymous$$s.

 posi = Vector2(Random.value*area.x,Random.value*area.z) ;

and the y position find by a raycast from a very $$anonymous$$gh point,to not raycast down of the terrain, like t$$anonymous$$s:

         var $$anonymous$$t : RaycastHit;
    var yofsset : float;
         if (Physics.Raycast (Vector3(posi.x,500,posi.y), -Vector3.up, $$anonymous$$t)) {
         yofsset = $$anonymous$$t.distance;
         }

and the y value of the objects position is seted by 500 - yofsset...

 var realposi : Vector3 = Vector3(posi.x,500-yofsset,posi.y);
 Instantiate(wichobject,realposi,wichobject.transform.rotation);

now you have a random instanciator! note that can have merging objects, t$$anonymous$$s is only a test.

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jaxsonp10 · Feb 18, 2014 at 12:26 AM 0

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What would all the code look like put together? I'm not sure what order to type all o this.

erick_weil · Feb 18, 2014 at 12:33 AM 0

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 #Pragma Strict
 var object : GameObject;
 function Start()
 {
 // the 100x100 is the area that become filled with your objects begining at origin
 generateisland(100,object,Vector3(100,0,100));
 }
 
 function generateisland(NumObjects : int,wichobject : GameObject,area : Vector3)
 {
 for(var i=0;i<NumObjects;i++)
 {
 posi = Vector2(Random.value*area.x,Random.value*area.z) ;
        var hit : RaycastHit;
    var yofsset : float;
        if (Physics.Raycast (Vector3(posi.x,500,posi.y), -Vector3.up, hit)) {
        yofsset = hit.distance;
        }
     
     var realposi : Vector3 = Vector3(posi.x,500-yofsset,posi.y);
 Instantiate(wichobject,realposi,wichobject.transform.rotation);
 }
 }

jaxsonp10 · Feb 18, 2014 at 01:02 AM 0

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Am I to attach this script to an empty game object, or?

erick_weil · Feb 18, 2014 at 01:37 AM 0

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attach this to any gameObject, and before asking here, test by yourself, the unity will not uninstall if you made ones mistakes...

and you need to assign a object to instance, in the inspector, see the "object" variable

an image to you

alt text

see the highlight area, is there you need to click to select a prefab to random instantiate, and remind to add your terrain(or a plane) to your scene, filling the area, (default 0,0 - 100,100)

jaxsonp10 · Feb 18, 2014 at 01:44 AM 0

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I tested it and got errors when I used the empty game object, So I was trying to make sure that wasn't the problem...

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Answer 2

Answer by thornekey · Feb 18, 2014 at 01:43 AM

when i was trying to spawn a pillar at a certain height i did t$$anonymous$$s:

 public double MaxHeight = 3.4f;
 public double MinHeight = -6.4f;
 
 void Spawn(){
     
       float rightScreenBound = 18;        
        float randomY = Random.Range(MinHeight, MaxHeight);
      Instantiate(PillarObject, new Vector3(rightScreenBound, randomY, 0), Quaternion.identity);
 
     }

the variables up the top are positions :)

hope its relevant

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Answer 3

Answer by Nidre · Feb 18, 2014 at 01:36 PM

You can take a look the script a have wrote a w$$anonymous$$le ago. It creates objects in a defined area. You can define density, shape etc..

http://wiki.unity3d.com/index.php/PopulateField

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Randomly Generated Objects inside an area

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