我正在研究基于光线投射的寻路系统。基本上我要做的是在对象周围生成点/检查该对象是否可以到达这些点，并检查这些点是否可以到达目标。目标是照片背面的绿色圆柱体。这是我的图层蒙版，它基本上说将玩家作为对撞机/障碍物忽略：
layerMask = Physics.DefaultRaycastLayers & ~(1 << 3);
这是我的光线投射代码：
// Check if enemy can see player without any obstructions
bool CanSeeDestination(Vector3 startingPoint, Vector3 destination)
{
if(Physics.Raycast(startingPoint, destination, 50f, layerMask))
{
Debug.DrawLine(startingPoint, destination, Color.red);
return false;
} else
{
Debug.DrawLine(startingPoint, destination, Color.green);
return true;
}
}
最后是我的寻路功能：
// Raycast based pathfinding
void Pathfind()
{
List<Vector3> surroundingPoints = new List<Vector3>();
bool foundTarget = false;
// Nested loop to build surrounding points vector array
for(var i = 1; i <= 10; i++)
{
for(var k = 1; k <= 10; k++)
{
// Offset by half of max to get negative distance
int offsetI = i - 5;
int offsetK = k - 5;
surroundingPoints.Add(new Vector3(transform.localPosition.x + offsetI, stepOverHeight.y, transform.localPosition.z + offsetK));
}
}
// Loop through array of surrounding vectors
for(var m = 0; m < surroundingPoints.Count; m++)
{
// If enemy can reach this surrounding point and this surrounding point has an unobstructed path to the target
if(CanSeeDestination(transform.localPosition, surroundingPoints[m]) && CanSeeDestination(surroundingPoints[m], player.transform.position))
{
float distanceFromEnemyToTarget = Vector3.Distance(transform.position, surroundingPoints[m]);
float distanceFromTargetToPlayer = Vector3.Distance(surroundingPoints[m], player.transform.position);
float totalDistance = distanceFromEnemyToTarget + distanceFromTargetToPlayer;
// If this total path distance is shorter than current path distance set this as target
if(totalDistance < currentPathDistance)
{
currentPathDistance = totalDistance;
target = surroundingPoints[m];
foundTarget = true;
}
}
}
if (!foundTarget)
{
target = transform.position;
}
}
由于某种原因，光线投射在障碍物的右侧而不是左侧触发。此外，如果我增加障碍物大小或对撞机大小，我最终可以挡住左侧。不知道为什么左边的光线投射是绿色的并且仍然通过对撞机。