不再看对象时停止勾画对象?

Question

我正在尝试制作一个拾取系统，我认为当你看着它时，在物品周围做一个轮廓会很酷。我所面临的问题是，当你不再看的对象，我需要禁用轮廓。我最终做了一个奇怪的解决方案，希望得到一些帮助来改进它。

public class PlayerCamera : MonoBehaviour
{
public Transform playerBody;
public Transform cameraHolder;
public float sensitivity;
public float currentY;
void Update()
{
MoveCamera();
LookingAtObject();
}
Outline objectOutline;
void LookingAtObject()
{
if(Physics.Raycast(cameraHolder.transform.position, cameraHolder.transform.forward, out var hit, Mathf.Infinity))
{
var obj = hit.collider.gameObject;
var outline = obj.GetComponent<Outline>();
if (obj && outline)
{
objectOutline = hit.transform.GetComponent<Outline>();
if (objectOutline)
objectOutline.OutlineWidth = 7;
}
else if (objectOutline)
objectOutline.OutlineWidth = 0;
}   
}
}

Answer 1

您可以将轮廓对象存储在一个变量中，当您击中不同的轮廓对象或没有击中时，将轮廓设置为零。

Outline objectOutline;
void LookingAtObject()
{
if (Physics.Raycast(...))
{
var outline = hit.collider.GetComponent<Outline>();
// Make sure the hit object is not the same one we already outlined
//
if (outline != objectOutline)
{
// Remove the outline from our previously viewed object
//
if (objectOutline != null)
{
objectOutline.OutlineWidth = 0;
}

// Store the new outline object
//
objectOutline = outline;
// Since outline could be null, we need to check null before outlining
//
if (objectOutline != null)
{
objectOutline.OutlineWidth = 7;
}
}
}
// If we have an object we outlined and we didnt hit anything, 
// remove the outline and reset the variable
//
else if (objectOutline != null)
{
objectOutline.OutlineWidth = 0;
objectOutline = null;
}
}

Answer 2

需要两个事件来解决这个问题。输入帧和射线输出帧。此代码通过记录前一个raycastHit帧并将其与当前命中进行比较来检测哪个raycast事件，并相应地设置大纲。

private RaycastHit lastHit;
void Update()
{
var ray = Camera.main.ScreenPointToRay(Input.mousePosition);
Physics.Raycast(ray, out var hit);
//Physics.Raycast(cameraHolder.transform.position, cameraHolder.transform.forward, out var hit, Mathf.Infinity);
if (hit.transform != lastHit.transform)
{
if (hit.transform) // when raycast Begin
{
var outline = hit.transform.GetComponent<Outline>();
outline.OutlineWidth = 7;
}
else if (lastHit.transform) // when raycast out
{
var outline = lastHit.transform.GetComponent<Outline>();
outline.OutlineWidth = 0;
}
}

lastHit = hit;
}

提示我评论了你的测试光线投射代码。如果你想像以前一样改变光线投射代码。