Instantiate prefab within bounds

Unity Engine
1

i’m trying to instantiate prefab on squared object, but i want to prevent it to be instantiated near or on the edges of the object.

2

Well, first you should calculate the edges of your object. If it’s just a cube, and you know how wide the thing is, you can calculate it pretty simply. Sphere is also easy ( just the radius ). Then when you are going to instantiate, check if the target position is inside the edges. Not that hard? Just break everything into pieces.

3 
public Vector3 squarePos;  //world position of your square
public Vector3 squareSize; //x = width, y = height, z = length of box
public float squareBorder; //how far away from the edges you want the spawn to stay
Vector3 realSquareSize;

void Awake(){
 realSquareSize = squareSize - (Vector3.one * squareBorder));

void SpawnPrefabOnSquare(GameObject thePrefabYouWantToSpawn){
  var spawnPos = squarePos + new Vector3(Random.Range(-realSquareSize.x, realSquareSize.x), Random.Range(-realSquareSize.y, realSquareSize.y), Random.Range(-realSquareSize.z, realSquareSize.z)) * 0.5f;
  Instantiate(thePrefabYouWantToSpawn, spawnPos, Quaternion.identity);
}
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