RTS rectangle selection system

Question

I'm trying to make a small RTS-like system where you can select your units and move them around. I was just wondering what the best/easiest method to make a classic rectangle massive selection system? (All it need to do is turn a boolean on the units called 'selected' to true)

-Thanks :)

Answer 1

Best Answer

Answer by Bunny83 · Jul 21, 2012 at 12:16 PM

It depends on the "style" you want. One way is, when your objects are located in a plane, to use a trigger and colliders on each unit. T$$anonymous$$s could be a bit buggy but you would have a 3D volume in the scene, in other words a true 3d selection area.

The other (and probably better) way is to keep a list of all selectable units (in some kind of gamemanager) and just transform the positions of all units into screenspace. There you can simply use Rect.Contains to test if a unit is inside a rectangle.

edit
I didn't downvote your question, but i guess someone did because it has been asked several times before:

http://answers.unity3d.com/questions/31693/view.html
http://answers.unity3d.com/questions/33901/view.html
http://answers.unity3d.com/questions/168680/view.html

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ragnaros100 · Jul 21, 2012 at 12:41 PM 0

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omg. I never thought of the second option :O ... Thanks man. I'm gonna try that out :)

(if it works, i'll accept your answer :) )

ragnaros100 · Jul 21, 2012 at 02:07 PM 0

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It worked! :D! Thank you so much!

Answer 2

Answer by mustafa · Jul 21, 2012 at 01:23 PM

I did t$$anonymous$$s before in C#, t$$anonymous$$s is how I did it if it helps:

if(Input.GetMouseButtonDown(0)) { downMousePosition = Input.mousePosition; } else if(Input.GetMouseButtonUp(0)) {

 RaycastHit $$anonymous$$t1;
 Physics.Raycast(Camera.main.ScreenPointToRay(downMousePosition), out $$anonymous$$t1);
 Vector3 v1 = $$anonymous$$t1.point;
 
 RaycastHit $$anonymous$$t2;
 Physics.Raycast(Camera.main.ScreenPointToRay(Input.mousePosition), out $$anonymous$$t2);
 Vector3 v2 = $$anonymous$$t2.point;

 Unit[] allUnits = GetAllUnits();

 foreach(Unit unit in allUnits) {
     Vector3 pos = unit.transform.position;
     //is inside the box
     if(Mathf.Max(v1.x, v2.x) &gt;= pos.x &amp;&amp; Mathf.Min(v1.x, v2.x) &lt;= pos.x
         &amp;&amp; Mathf.Max(v1.z, v2.z) &gt;= pos.z &amp;&amp; Mathf.Min(v1.z, v2.z) &lt;= pos.z) {
         //selecte the unit
         Selecte(unit);
     }
 }

}

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ragnaros100 · Jul 21, 2012 at 02:07 PM 0

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omg you guys :D... thanks for all the answers.

Ziron999 · Sep 17, 2015 at 01:48 AM 0

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I recommend using a for instead of a foreach for performance reasons...

Bunny83 Ziron999 · Sep 17, 2015 at 09:17 AM 0

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Since "allUnits" is an array you won't see any preformance differences between for and foreach since it would be implemented as for loop.

Also the for loop is only executed once when you release the mouse button. So this isn't something where preformance plays any role

Answer 3

Answer by Sharpytwo · Jul 21, 2012 at 01:23 PM

well, t$$anonymous$$s isnt really the whole answer, as i do not have it :P
but somet$$anonymous$$ng that might help you though, is t$$anonymous$$s:

function Update () { var unitPos : Vector3 = Camera.main.WorldToViewportPoint (transform.position); //Debug.Log ("Unit is located at: X:"+ unitPos[0] + "Y:"+ unitPos[1]);

}
attach t$$anonymous$$s to the unit being selected.
it reports the unit position on camera. so if you are able draw a rectangle and calculate if t$$anonymous$$s position is wit$$anonymous$$n that rectangle, you are pretty much there. hope t$$anonymous$$s helped somewhat, still working on the same problem myself :-) edit: i see that several people answered just about the same t$$anonymous$$ng before me, but that didnt show when i posted, sorry. :)

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ragnaros100 · Jul 21, 2012 at 02:08 PM 0

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its okay :) ... Thanks for the answer though! :D

RTS rectangle selection system

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