选择和取消选择游戏对象以更改材质

Question

我的代码有一些问题。我正在尝试创建一个突出显示功能，这样玩家就可以点击游戏对象并查看他们选择了什么。

• 我希望它保持突出显示直到他们选择另一个对象
• 当他们选择另一个对象时，默认材质为应用回上一个游戏对象。而且将为每个对象继续选择并取消选择

---

有人能帮我吗？我试过一些东西，但它只是保持了颜色不变。

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
public class SelectionManager : MonoBehaviour
{
[SerializeField] private string selectableTag = "Selectable";
[SerializeField] private Material highlightMaterial;
private Material originalMaterial;
private GameObject selected;
private GameObject oldSelected;
// Start is called before the first frame update
void Start()
{

}
// Update is called once per frame
void Update()
{
Renderer selectionRenderer;
//change the color to the highlight
if (Input.GetMouseButtonDown(0))
{
//if selected set to highlight color
var ray = Camera.main.ScreenPointToRay(Input.mousePosition);
RaycastHit hit;
if (Physics.Raycast(ray, out hit, 300.0f))
{
selected = hit.transform.gameObject;
Debug.Log("1111 new Selection --> " + selected);
if (selected.CompareTag(selectableTag))
{
if(selected != oldSelected || oldSelected == null)
{
//save the original material
selectionRenderer = selected.GetComponent<Renderer>();
originalMaterial = selectionRenderer.material;
selectionRenderer.material = highlightMaterial;

Debug.Log("Old Selection --> " + oldSelected);
Debug.Log("new Selection --> " + selected);
}
else
{
oldSelected = selected;
Debug.Log("you have selected a new building");
oldSelected.GetComponent<Renderer>().sharedMaterial = originalMaterial;
}
//comment 2
}
}
//comment 3
}

//comment1
}

void ClearSelection()
{
if (selected == null)
{
return;
}
else
{
selected.GetComponent<Renderer>().sharedMaterial = originalMaterial;
selected = null;
}
}
}

Answer 1

所以问题基本上是没有正确分配oldSelected。

解决这个问题，你的代码应该看起来像：

using UnityEngine;
public class SelectionManager : MonoBehaviour
{
[SerializeField] private string selectableTag = "Selectable";
[SerializeField] private Material highlightMaterial;
private Material originalMaterial;
private GameObject selected = null;
private GameObject oldSelected = null;
private Renderer selectionRenderer;
private Renderer oldSelectionRenderer;
// Update is called once per frame
void Update()
{
//change the color to the highlight
if (Input.GetMouseButtonDown(0))
{
//if selected set to highlight color
var ray = Camera.main.ScreenPointToRay(Input.mousePosition);
RaycastHit hit;
if (Physics.Raycast(ray, out hit, 300.0f))
{
selected = hit.transform.gameObject;
Debug.Log("1111 new Selection --> " + selected);
if (selected.CompareTag(selectableTag))
{
//newSelection
if(selected != oldSelected)
{
//Set original material to oldSelected if it's not the first selection
if(oldSelected != null)
{
oldSelectionRenderer = oldSelected.GetComponent<Renderer>();
oldSelectionRenderer.material = originalMaterial;
}
//Set highlighted material to selected
selectionRenderer = selected.GetComponent<Renderer>();                        
originalMaterial = selectionRenderer.material;                        
selectionRenderer.material = highlightMaterial;
//assign oldSelected GO to your current selection
oldSelected = selected;
}
}
}
}
}
}