How instantiate only one prefab at different spawn place ?

Ok, not to sure what you mean by spawn must run when I click on a specific model, but I’m assu$$anonymous$$g you need the prefab to react to a click on it by running?? Anyhow, you can spawn a prefab at a different spawn position 2 times by using Instantiate(prefab, worldPositionYouWant, rotationYouWant, transformsParent); 2 times, but with 2 different positions.

Thereafter you can use the mousePosition, which is in screen space and needs to be turned into world space with Camera.ScreenToWorldPoint() for example, and you can raycast to see if you hit one of your prefabs and if so, you can make it run. Not sure if that was the idea, but that is what I understood from your question.

Thank you !! I have an other problem... Spawn running perfectly but my script is overload : I have 90 prefab's initialization 1 group -> 6 sphere there are 15 groups When value in a slider change(increase or decrease) one groupe appear or disappear

public class CameraDetection : $$anonymous$$onoBehaviour {

 public SpawnOne[] spawn;
 public double[] nmb = new double[2];
 private int i = 0;

 // Update is called once per frame
 public void Detection () {
     Ray ray = Camera.main.ScreenPointToRay (Input.mousePosition);
     RaycastHit hit;
         if (Input.Get$$anonymous$$ouseButtonDown (0)) {

             if (Physics.Raycast (ray, out hit) && i < 2) {
             
             if (hit.transform.tag == "sphere1") {
                     spawn [0].Spawn ();
                     nmb [i] = -1.0;
                     i++;

                 } else if (hit.transform.tag == "sphere2") {
                 
                     spawn [1].Spawn ();
                     nmb [i] = -1.1;
                     i++;
                 } else if (hit.transform.tag == "sphere3") {
                 
                     spawn [2].Spawn ();
                     nmb [i] = -1.2;
                     i++;
                 } else if (hit.transform.tag == "sphere4") {
                 
                     spawn [3].Spawn ();
                     nmb [i] = -1.3;
                     i++;
                 } else if (hit.transform.tag == "sphere5") {
                 
                     spawn [4].Spawn ();
                     nmb [i] = -1.4;
                     i++;
                 } else if (hit.transform.tag == "sphere6") {
                 
                     spawn [5].Spawn ();
                     nmb [i] = -1.5;
                     i++;
                 }else if (hit.transform.tag == "sphere1.1") {

                     spawn [6].Spawn ();
                     nmb [i] = -1.1;
                     i++;
                 }
                 else if (hit.transform.tag == "sphere1.2") {
                 
                     spawn [7].Spawn ();
                     nmb [i] = -1.1;
                     i++;
                 } else if (hit.transform.tag == "sphere1.3") {
                 
                     spawn [8].Spawn ();
                     nmb [i] = -1.2;
                     i++;
                 } else if (hit.transform.tag == "sphere1.4") {
                 
                     spawn [9].Spawn ();
                     nmb [i] = -1.3;
                     i++;
                 } else if (hit.transform.tag == "sphere1.5") {
                 
                     spawn [10].Spawn ();
                     nmb [i] = -1.4;
                     i++;
                 } else if (hit.transform.tag == "sphere1.6") {
                 
                     spawn [11].Spawn ();
                     nmb [i] = -1.5;
                         i++;
                 } else if (hit.transform.tag == "sphere2.1") {
                 
                     spawn [12].Spawn ();
                     nmb [i] = -1.1;
                     i++;
                 } else if (hit.transform.tag == "sphere2.2") {
                     
                     spawn [13].Spawn ();
                     nmb [i] = -1.1;
                     i++;
                 } else if (hit.transform.tag == "sphere2.3") {
                 
                     spawn [14].Spawn ();
                     nmb [i] = -1.2;
                     i++;
                 } else if (hit.transform.tag == "sphere2.4") {
                 
                     spawn [15].Spawn ();
                     nmb [i] = -1.3;
                     i++;
                 } else if (hit.transform.tag == "sphere2.5") {
                 
                     spawn [16].Spawn ();
                     nmb [i] = -1.4;
                     i++;
                 } else if (hit.transform.tag == "sphere2.6") {
                 
                     spawn [17].Spawn ();
                     nmb [i] = -1.5;
                     i++;
             } 
         }
     }
 }

}