Unity physics.raycast Ray projection

BOOL Physics.raycast (Vector3 origin, Vector3 direction, float distance, int layermask)

True if Ray casts intersect with any collider, otherwise false.

BOOL Physics.raycast (Ray Ray, Vector3 direction, raycasthit out hit, float

distance, int layermask)

A light that can collide with all the collider in the scene and return details of the collision ().

BOOL Physics.raycast (Ray Ray, float distance, int layermask)

True if Ray casts intersect with any collider, otherwise false.

BOOL Physics.raycast (Vector3 origin, Vector3 direction, raycasthit out Hit,float

distance, int layermask)

True if Ray casts intersect with any collider, otherwise false.

Note: If the light is cast from the inside of a spherical body to the outside, it is returned as false.

Parameter understanding:

Origin: The starting point of the ray in world coordinates

Direction: direction of the Ray

Distance: Length of the Ray

Hit: Use the Out keyword in C # to pass in an empty collision information class, then assign a value after the collision. Can get a collision object

Transform,rigidbody,point and other information.

Layermask: Only the collider within the Layermask layer is selected, and the other in-layer collider is ignored. Selective collisions

Raycasthit[] Raycastall (Ray Ray, float distance, int layermask)

Casts a ray and returns all collisions, that is, projecting the light and returning a raycasthit[] structure.

The following is a small example of a pickup made using a ray (drag the code directly onto the main camera)

Using unityengine;using system.collections;public class raytest : monobehaviour  {    // use this for initialization    void  Start  ()  {        }         // update is called once per frame    void  Update  (     {        if) ( Input.getmousebutton (0))         {             ray ray = camera.main.screenpointtoray (Input.mousePosition) ;//X-ray from camera to click coordinates             RaycastHit  Hitinfo;            if (Physics.Raycast (ray,out  hitinfo))    &Nbsp;        {                 debug.drawline (ray.origin,hitinfo.point);//underline the ray, only in scene view can see                 gameobject  gameObj = hitInfo.collider.gameObject;                 debug.log ("click object name is "  +  Gameobj.name);                 if (gameobj.tag ==  "boot")//When the Ray collision target is the boot type of the item  , perform a pickup operation                  {                     debug.log ("pick up!");                 }             }        }    }}

Unity physics.raycast Ray projection