Question

怎么使用Unity相机确定AI代理的视线范围，求大神

Answer 1

Unity提供了很多方式来分析游戏世界。它有像Physics.RayCast(…)或Physics.OverlapSphere(…) 这样的函数，它也给我们提供关于边界，网格和渲染器的信息。对我的项目来说，人工智能代理必须能够寻找目的地，可以访问所有他们看到和感兴趣对象。

现在我们有一个函数告诉我们一个特定的对象是否在人工智能的视线内，我只是测试每个对象，由一个相机位置为原点，以相机远平面的距离为半径进行重叠范围检查。我为每个对象调用之前的SeeGameObject函数并将在视线内的对象保存在一个数组中。

public bool SeeGameObject(GameObject go)

{

// if object has a renderer and visible by any camera and is in this camera frustum

if(go.renderer != null && go.renderer.isVisible && GeometryUtility.TestPlanesAABB(GeometryUtility.CalculateFrustumPlanes(_camera), go.renderer.bounds))

{

RaycastHit hitInfo;

// by default we use the rough renderer bounds

Vector3 center = go.renderer.bounds.center;

Vector3 extents = go.renderer.bounds.extents;

float coefreduc = 0.8f;

Vector3[] gobounds; // points to check for linecast from camera

MeshFilter meshfilter = go.GetComponent<MeshFilter>();

if(meshfilter != null) // Almost every interesting game object that is render has a mesh

{

center = go.transform.position;

extents = meshfilter.mesh.bounds.extents;

extents.Scale(go.transform.lossyScale);

gobounds = new Vector3[33]{ // We can add more or remove some, it increase precision for not too much time or memory cost

Vector3.zero,

go.transform.TransformDirection(new Vector3(extents.x,extents.y,extents.z)*0.9f),

go.transform.TransformDirection(new Vector3(extents.x,extents.y,-extents.z)*0.9f),

go.transform.TransformDirection(new Vector3(extents.x,-extents.y,extents.z)*0.9f),

go.transform.TransformDirection(new Vector3(extents.x,-extents.y,-extents.z)*0.9f),

go.transform.TransformDirection(new Vector3(-extents.x,extents.y,extents.z)*0.9f),

go.transform.TransformDirection(new Vector3(-extents.x,extents.y,-extents.z)*0.9f),

go.transform.TransformDirection(new Vector3(-extents.x,-extents.y,extents.z)*0.9f),

go.transform.TransformDirection(new Vector3(-extents.x,-extents.y,-extents.z)*0.9f),

go.transform.TransformDirection(new Vector3(extents.x,extents.y,extents.z)*0.5f),

go.transform.TransformDirection(new Vector3(extents.x,extents.y,-extents.z)*0.5f),

go.transform.TransformDirection(new Vector3(extents.x,-extents.y,extents.z)*0.5f),

go.transform.TransformDirection(new Vector3(extents.x,-extents.y,-extents.z)*0.5f),

go.transform.TransformDirection(new Vector3(-extents.x,extents.y,extents.z)*0.5f),

go.transform.TransformDirection(new Vector3(-extents.x,extents.y,-extents.z)*0.5f),

go.transform.TransformDirection(new Vector3(-extents.x,-extents.y,extents.z)*0.5f),

go.transform.TransformDirection(new Vector3(-extents.x,-extents.y,-extents.z)*0.5f),

go.transform.TransformDirection(new Vector3(extents.x,extents.y,extents.z)*0.75f),

go.transform.TransformDirection(new Vector3(extents.x,extents.y,-extents.z)*0.75f),

go.transform.TransformDirection(new Vector3(extents.x,-extents.y,extents.z)*0.75f),

go.transform.TransformDirection(new Vector3(extents.x,-extents.y,-extents.z)*0.75f),

go.transform.TransformDirection(new Vector3(-extents.x,extents.y,extents.z)*0.75f),

go.transform.TransformDirection(new Vector3(-extents.x,extents.y,-extents.z)*0.75f),

go.transform.TransformDirection(new Vector3(-extents.x,-extents.y,extents.z)*0.75f),

go.transform.TransformDirection(new Vector3(-extents.x,-extents.y,-extents.z)*0.75f),

go.transform.TransformDirection(new Vector3(extents.x,extents.y,extents.z)*0.25f),

go.transform.TransformDirection(new Vector3(extents.x,extents.y,-extents.z)*0.25f),

go.transform.TransformDirection(new Vector3(extents.x,-extents.y,extents.z)*0.25f),

go.transform.TransformDirection(new Vector3(extents.x,-extents.y,-extents.z)*0.25f),

go.transform.TransformDirection(new Vector3(-extents.x,extents.y,extents.z)*0.25f),

go.transform.TransformDirection(new Vector3(-extents.x,extents.y,-extents.z)*0.25f),

go.transform.TransformDirection(new Vector3(-extents.x,-extents.y,extents.z)*0.25f),

go.transform.TransformDirection(new Vector3(-extents.x,-extents.y,-extents.z)*0.25f)

};

}

else // Only if gameobject has no mesh (= almost never) (Very approximately checking points using the renderer bounds and not the mesh bounds)

{

gobounds = new Vector3[9]{

Vector3.zero,

new Vector3(extents.x,extents.y,extents.z)*coefreduc,

new Vector3(extents.x,extents.y,-extents.z)*coefreduc,

new Vector3(extents.x,-extents.y,extents.z)*coefreduc,

new Vector3(extents.x,-extents.y,-extents.z)*coefreduc,

new Vector3(-extents.x,extents.y,extents.z)*coefreduc,

new Vector3(-extents.x,extents.y,-extents.z)*coefreduc,

new Vector3(-extents.x,-extents.y,extents.z)*coefreduc,

new Vector3(-extents.x,-extents.y,-extents.z)*coefreduc

};

}

foreach(Vector3 v in gobounds)

{

// test if it can see gameobject

if(GeometryUtility.TestPlanesAABB(GeometryUtility.CalculateFrustumPlanes(_camera), new Bounds(v+center, Vector3.zero)) // if point in viewing frustrum

&& (!Physics.Linecast(transform.position, v+center, out hitInfo) || hitInfo.collider.gameObject == go )) // if nothing between viewing position and point

{

if(graphicalDebug)

{

Debug.DrawLine(transform.position, v+center,Color.red, 0.01f, false);

}

return true;

}

}

}

return false;

}
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