targeting multiple enemies issue

Question

For some reason I'm getting an error with this code. What am I doing wrong? I want it to engage at any target with the same tag but I keep getting the same error on the var targetDir "Not set to an instance" I believe is what it says.

 var target : GameObject[];
 var Range = 4;
 
 function Update()
 {
     target = GameObject.FindFindGameObjectsWithTag("Enemy");
     var forward = transform.forward;
     var targetDir = target.position - transform.position;
     var angle = Vector3.Angle(targetDir, forward);
     if(Vector3.Distance(transform.position, target.position) < Range)
     {
         if(angle < 45)
         {
             Engage();
         }

Answer 1

Best Answer

Answer by chemicalvamp · Nov 15, 2011 at 09:09 AM

Well you see target is an array, just saying target.position isn't going to have a value. But you do target[0].position will give you the position of the first gameobject in that array. You could check each of them by doing something like this:

 var objectArray : GameObject[];
 var Range = 4;
 
     function Update()
     {
         objectArray = GameObject.FindFindGameObjectsWithTag("Enemy");
         for (int i = 0; i < objectArray.Length; i++)
         {
             var target = objectArray[i];
             var targetDir = target.position - transform.position;
             var angle = Vector3.Angle(targetDir, forward);
             if (Vector3.Distance(transform.position, target.position) < Range)
             {
                 if (angle < 45)
                 {
                     Engage(target);
                 }
             }
         }
     }

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ocularcash · Nov 15, 2011 at 10:11 AM 0

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On yours when I add the forward and delete one the of the Find's from FindGameObjects I'm getting System.Int32.position not found

chemicalvamp · Nov 15, 2011 at 10:13 AM 0

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Sorry, see if "var target = objectArray[i].gameObject;" works.

ocularcash · Nov 15, 2011 at 10:33 AM 0

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Now I'm getting the same error as before

chemicalvamp · Nov 15, 2011 at 07:37 PM 0

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The next thing I would try is replacing target.position to target.transform.position. Also if you haven't already Engage needs to have an input parameter to receive the target. I did something kinda similar to this for one of my games, but ins$$anonymous$$d of searching through all objects with that tag, I used a custom mesh for collision kinda like FOV and then did a raycast to test line of sight as well as spheres to catch sounds (Sorry I cant test this myself and give you a definitive answer I just reinstalled windows and don't have anything installed yet.)

ocularcash · Nov 16, 2011 at 09:47 PM 0

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Thanks :) that works perfectly just adding transform. Def props on that

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Answer 2

Answer by syclamoth · Nov 15, 2011 at 08:50 AM

target is an array of gameObjects- it doesn't have a 'position' member variable! I think for this to make sense, you need to loop over all the members of 'target'. Do you want to call the 'Engage()' method for every single enemy in range, or only for one? In any case, the code is not much different.

for(var curTarg : GameObject in target) { var targetDir : Vector3 = curTarg.transform.position - transform.position; if(Vector3.Distance(curTarg.transform.position, transform.position) < range && Vector3.Angle(targetDir, transform.forward) < 45) { Engage();

     // if you want to call Engage for every singe candidate
     // (rather than if there is only one), comment this out.
     break;
 }

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ocularcash · Nov 15, 2011 at 10:07 AM 0

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I get the error Operator < cannot be used with a left hand side of type 'float'

syclamoth · Nov 15, 2011 at 10:15 AM 1

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Sorry, did you just copypasta that? I don't think I spelled 'range' the same way you did, since I object to capitalised variable names.

ocularcash · Nov 15, 2011 at 10:23 AM 0

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ya. I capitalized it but I'm still pulling errors. I tried a few different variations but I just can't get it. I don't have any troubles adding arrays right when I'm just using a radius but for using angle it seems like the errors just don't go away

targeting multiple enemies issue

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