gather-and-defend/Assets/Scripts/Drag&Drop/GameObjectPlacementButton.cs

using UnityEngine;

public class GameObjectPlacementButton : UnitPlacementButton
{
    [SerializeField]
    private GameObject _prefab;
    protected override void Place()
    {
        var instance = Instantiate(_prefab);

        //we need to do that before stripping the object
        var detectComp = instance.GetComponentInChildren<Detection>();
        Rect detectionRect = default;
        if(detectComp) detectionRect = instance.GetComponentInChildren<Detection>().DetectionRectangle;

        //strip the objecty
        foreach (var comp in instance.transform.GetAllComponents<Rigidbody2D>()) Destroy(comp);
        foreach (var comp in instance.transform.GetAllComponents<Collider2D>()) Destroy(comp);
        foreach (var comp in instance.transform.GetAllComponents<MonoBehaviour>()) Destroy(comp);

        foreach (var comp in instance.transform.GetAllComponents<SpriteRenderer>())
        {
            var color = (comp as SpriteRenderer).color;
            color.a = 0.6f;
            (comp as SpriteRenderer).color = color;

            (comp as SpriteRenderer).material = _outlineMaterial;
        }
        

        var placeholder = instance.AddComponent<ObjectPlaceholder>();
        placeholder.Prefab = _prefab;

        CreateRange(placeholder, detectionRect);
    }

    void CreateRange(DraggablePlaceholder placeholder, Rect detectionRect)
    {
        if (detectionRect == default) return;

        var detection = new GameObject("Detection");

        var rend = detection.AddComponent<SpriteRenderer>();
        rend.sprite = _detectionRangeSprite;
        rend.sortingLayerName = "Character";
        rend.sortingOrder = 0;
        rend.color = new Color(1, 1, 1, 0.2f);

        detection.transform.SetParent(placeholder.transform);
        detection.transform.localPosition = detectionRect.center;
        detection.transform.localScale = detectionRect.size;
    }
}