需求:
在车拐弯的时候出现轮胎压痕。
压痕出现条件:
①.轮胎触碰到地板
②.轮胎角度有偏移
③.轮胎在转动
胎痕是断续的,所以每一段胎痕是单独的一个TrailRenderer
轮胎的转动跟角度可以通过wheelCollider来判断
轮胎触碰地板可以通过WheelCollider或者用射线的方式进行判断
压痕组件:
public class TireIndentation : MonoBehaviour
{
Vehicles car;
WheelCollider wheel;
int index;
public TrailRenderer render;
}
通过射线检测轮胎是否着地
bool IsDrawIndentation(out Vector3 indentationPos)
{
if (wheel == null)
{
indentationPos = Vector3.zero;
return false;
}
Vector3 pos = wheel.transform.position;
Ray ray = new Ray(pos, Vector3.down);
RaycastHit hit;
bool isHit = Physics.Raycast(ray, out hit, wheel.radius + 0.1f, GlobalValue.GroundLayer);
if (isHit)
{
Debug.DrawLine(hit.point, pos);
indentationPos = hit.point;
//indentationPos
}
else indentationPos = Vector3.zero;
return isHit;
}
通过移动TrailRenderer来绘制压痕
public void OnDrawIndentation()
{
Vector3 pos;
bool isDraw = IsDrawIndentation(out pos);
if (isDraw)
render.transform.position = pos;
else
{
OnBreakIndentation();
}
}
断开压痕
public void OnBreakIndentation()
{
wheel = null;
if(car != null) car.indentationComp[index] = null;
this.transform.parent = null;
}
外部调用:
//绘制
virtual protected void ShowIndentationComp()
{
CreateIndentationComp();
for(int i = 0;i < 2; i++)
{
indentationComp[i].OnDrawIndentation();
}
}
//创建一段新的压痕
virtual protected void CreateIndentationComp()
{
for(int i = 0;i < 2; i++)
{
if (indentationComp[i]) continue;
TireIndentation indentation =
TireIndentation.CreateIndentation(i, wheelColliders[i + 2], this);
indentationComp[i] = indentation;
}
}
//是否绘制
virtual protected bool IsShowIndentation()
{
if (!isPlayer) return false;
Vector3 euler = this.transform.eulerAngles;
if (euler.y > 180) euler.y -= 360;
if (Mathf.Abs(euler.y) > GlobalValue.turnSideMaxAngle / 3)
return true;
else
return false;
}
//每帧执行
public void Update()
{
if (IsShowIndentation())
ShowIndentationComp();
else
{
for(int i= 0; i < 2; i++)
{
if (indentationComp[i] == null) continue;
else indentationComp[i].OnBreakIndentation();
}
}
}
最终画出来的压痕
![在这里插入图片描述](https://img-blog.csdnimg.cn/20190430173119735.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMzMjA1NTYx,size_16,color_FFFFFF,t_70)