Unity--光线投射碰撞Physics.Raycast和Physics.RaycastAll

Physics.Raycast
光线投射

static function Raycast (origin : Vector3, direction : Vector3, distance :
float = Mathf.Infinity, layerMask :
int = kDefaultRaycastLayers) : bool

Parameters参数

origin
The starting point of the ray in world coordinates.

在世界坐标，射线的起始点。

direction
The direction of the ray.

射线的方向。

distance
The length of the ray

射线的长度。

layerMask
A Layer mask that is used to selectively ignore colliders when casting a ray.

只选定Layermask层内的碰撞器，其它层内碰撞器忽略。

返回值

当光线投射与任何碰撞器交叉时为真，否则为假。

描述

在场景中投下可与所有碰撞器碰撞的一条光线。

function Update () {
var fwd = transform.TransformDirection (Vector3.forward);
if (Physics.Raycast (transform.position, fwd, 10)) {
print ("There is something in front of the object!");
}
}

注意：如果从一个球型体的内部到外部用光线投射，返回为假。

tatic function Raycast (origin : Vector3, direction : Vector3, out
hitInfo : RaycastHit, distance :
float = Mathf.Infinity, layerMask :
int = kDefaultRaycastLayers) : bool

Parameters参数

origin
The starting point of the ray in world coordinates.

在世界坐标，射线的起始点。

direction
The direction of the ray.

射线的方向。

distance
The length of the ray

射线的长度。

hitInfo
If true is returned, hitInfo will contain more information about where the collider was hit (See Also: RaycastHit).

如果返回true，hitInfo将包含碰到器碰撞的更多信息。

layerMask
A Layer mask that is used to selectively ignore colliders when casting a ray.

只选定Layermask层内的碰撞器，其它层内碰撞器忽略。

Returns

bool – True when the ray intersects any collider, otherwise false.

当光线投射与任何碰撞器交叉时为真，否则为假。

Description描述

Casts a ray against all colliders in the scene and returns detailed information on what was hit.

在场景中投下可与所有碰撞器碰撞的一条光线，并返回碰撞的细节信息。

function Update () {
var hit : RaycastHit;
if (Physics.Raycast (transform.position, -Vector3.up, hit)) {
var distanceToGround = hit.distance;
}
}
又一个例子：

C#JavaScript
// Raycast up to 100 meters forward
//光线向前投射100米远
function Update () {
var hit : RaycastHit;
if (Physics.Raycast (transform.position, -Vector3.up, hit, 100.0)) {
var distanceToGround = hit.distance;
}
}

static function Raycast (ray : Ray, distance :
float = Mathf.Infinity, layerMask :
int = kDefaultRaycastLayers) : bool

Parameters参数

ray
The starting point and direction of the ray.

射线的起点和方向

distance
The length of the ray

射线的长度。

layerMask
A Layer mask that is used to selectively ignore colliders when casting a ray.

只选定Layermask层内的碰撞器，其它层内碰撞器忽略。

Returns

bool – True when the ray intersects any collider, otherwise false.

当光线投射与任何碰撞器交叉时为真，否则为假。

Description描述

Same as above using ray.origin and ray.direction instead of origin and direction.

使用ray.origin和ray.direction同上，替代origin和direction。

C#

JavaScript

var ray = Camera.main.ScreenPointToRay (Input.mousePosition);
if (Physics.Raycast (ray, 100)) {
print ("Hit something");
}

• static function Raycast (ray : Ray, out
hitInfo : RaycastHit, distance :
float = Mathf.Infinity, layerMask :
int = kDefaultRaycastLayers) : bool

Parameters参数

ray
The starting point and direction of the ray.

射线的起点和方向

distance
The length of the ray

射线的长度

hitInfo
If true is returned, hitInfo will contain more information about where the collider was hit (See Also: RaycastHit).

如果返回true，hitInfo将包含碰到器碰撞的更多信息。

layerMask
A Layer mask that is used to selectively ignore colliders when casting a ray.

只选定Layermask层内的碰撞器，其它层内碰撞器忽略。

Returns

bool – True when the ray intersects any collider, otherwise false.

当光线投射与任何碰撞器交叉时为真，否则为假。

Description描述

Same as above using ray.origin and ray.direction instead of origin and direction.

使用ray.origin和ray.direction同上，替代origin和direction。

var ray = Camera.main.ScreenPointToRay (Input.mousePosition);
var hit : RaycastHit;
if (Physics.Raycast (ray, hit, 100)) {
Debug.DrawLine (ray.origin, hit.point);
}

方法二：Physics.RaycastAll 光线投射

static function RaycastAll (ray : Ray, distance :
float = Mathf.Infinity,
layerMask : int = kDefaultRaycastLayers) : RaycastHit[]

static function RaycastAll (origin : Vector3,
direction : Vector3,
distance : float = Mathf.Infinity,
layermask : int = kDefaultRaycastLayers) : RaycastHit[]

投射一条光线并返回所有碰撞，也就是投射光线并返回一个RaycastHit[]结构体。

使用光线投射碰撞可以达到的效果：在还没有发生真正的物理碰撞之前，就响应碰撞。

不用使用物理碰撞接口 OnControllerColliderHit