How can i assign prefab to variable without drag & drop from project to inspector.

Question

example: I have a script that instantiate a weapon.

function SetWeapon(weaponType:GameObject){
     var clone = Instantiate (weaponType, transform.position, transform.rotation);
}

How can i pass prefab in SetWeapon(); or if i have something like this:

var weapon:GameObject;

function SetWeapon(){ var clone = Instantiate (weapon, transform.position, transform.rotation); }

I know how to assign prefab from inspector, but how to change it from runtime. And if it is possible I like to avoid my weapons siting in the scene and setting weapon variable by gameObject.Find();

Thanks in advance :P

Answer 1

Best Answer

Answer by duck · Oct 12, 2010 at 08:37 AM

You can do this by making use of the Resources Folder.

From the example on the Resources.Load scripting reference:

// Instantiates a prefab at the path "Assets/Resources/enemy".

function Start () {
    var instance : GameObject = Instantiate(Resources.Load("enemy"));
}

However

Why do you want to do this?

It might be a good idea if you stated your broader goal - why you want to avoid prefab references - because it might help someone give a more helpful answer.

There are many reasons why prefab references are a good way to organise your project, and trying to bypass the way Unity is designed to work is generally not a good idea unless you have a specific reason that warrants it.

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beloto · Oct 12, 2010 at 09:49 AM 0

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Thank you for the answer. I was thinking to call SetWeapon() with the name of the prefab as a parameter and then menage the destruction of the previous weapon and instantiating of the new one in the body of the function. That way i can swap the weapon with a call of single function. And when i think about it again. I can do the same by assigning the same script with different script links in the inspector on the buttons that change the weapon. Resources.Load solve the problem the way I imagine it should be solved.And i am not sure that is the best way hehehe thank you again ;)

duck ♦♦ · Oct 12, 2010 at 11:48 AM 2

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Yes, this isn't the best way. What you describe doesn't warrant the use of "Resources". You could use a Hashtable if you specifically want to reference your weapons by name, but typically this isn't necessary. I'd suggest using a "weapons" array, in which you can place a reference to every kind of weapon prefab, and then pulling out items from that array for instantiation.

beloto · Oct 12, 2010 at 02:46 PM 0

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Ah yeah array. that will be great way to house all the prefabs in one variable - place. and then i can pass separate index in the function.It will do exactly what i need. I already make solution without Resources.Load() where i put the same script on a different skill button, but linked different prefabs. In that way I reused the same script. Thank you for the array idea, that will work great also.

Answer 2

//just drop this script in button that you want to act like weapon changer //use this var in inspector to set the parent of the weapon (drag and drop) var weaponParent:GameObject; //use this var in the inspector to set the weapon to be instanced var weaponToSet:GameObject; //set this one in the inspector for the keyboard shortcut (default 0) var shortcut:String="0";

//tag weapons with weapon tag to get cleaned by this function function RemoveOldWeapon (){ var weapons : GameObject[]; weapons = GameObject.FindGameObjectsWithTag("weapon"); if(weapons.length > 0){ for (var wep: GameObject in weapons) { Destroy(wep); } } }

//function that instantiate the weapon function SetWeapon (){ var clone = Instantiate (weaponToSet, weaponParent.transform.position, weaponParent.transform.rotation); clone.transform.parent = weaponParent.transform; }

//function that use mouse klick to swap the weapon function OnMouseDown (){ RemoveOldWeapon(); SetWeapon(); }

function Update (){ //function that use keyboard shortcut to swap the weapon if (Input.GetKeyDown (shortcut)){ RemoveOldWeapon(); SetWeapon(); }

}

here is the solution that i make when i rethink the problem. Big thanks to Duck for helping me come with this solution.

How can i assign prefab to variable without drag & drop from project to inspector.

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