[クリエイティブ機能作ってみた記事]配置プレビュー付きコード

CreateRayPoint37_1.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class CreateRayTarget : MonoBehaviour
{
    [SerializeField]
    private float distance = 20.0f;
    [SerializeField]
    private GameObject clone;
    private Camera camera;
    private GameObject previewClone;
    [SerializeField]
    private Material previewMaterial;

    private void Start()
    {
        camera = GetComponent<Camera>();
        previewClone = Instantiate(clone);
        previewClone.GetComponent<MeshRenderer>().material = previewMaterial;
        previewClone.GetComponent<BoxCollider>().enabled = false;
    }

    // Update is called once per frame
    void Update()
    {
        Ray ray = camera.ScreenPointToRay(Input.mousePosition);
        RaycastHit hit;
        if (Physics.Raycast(ray, out hit, distance))
        {
            Vector3 movement = Vector3.Scale(previewClone.transform.localScale, hit.normal) / 2;
            previewClone.transform.position = new Vector3(hit.point.x + movement.x, hit.point.y + movement.y, hit.point.z + movement.z);
            if (Input.GetMouseButtonUp(0))
            {
                Instantiate(clone, previewClone.transform.position, Quaternion.identity);
            }
        }
    }
}