Raycast用法_raycost

作者：小蓝xlanll | 2024-04-08 18:43:19

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raycost

1.射线Ray

Ray from the camera

The Ray always corresponds to a point in the view, so the Camera class provides the ScreenPointToRay and ViewportPointToRay functions.

The difference between the two is that ScreenPointToRay expects the point to be provided as a pixel coordinate, while ViewportPointToRay takes normalized coordinates in the range 0..1 (where 0 represents the bottom or left and 1 represents the top or right of the view).

Each of these functions returns a Ray which consists of a point of origin and a vector which shows the direction of the line from that origin.

The Ray originates from the near clipping plane rather than the Camera’s transform.position point.

2.Physics.Raycast

static bool Raycast ( Ray ray , RaycastHit hitInfo , float distance = Mathf.Infinity, int layerMask = DefaultRaycastLayers);

ray	The starting point and direction of the ray.
distance	The length of the ray.
hitInfo	If true is returned, `hitInfo` will contain more information about where the collider was hit (See Also:RaycastHit).
layerMask	A Layer mask that is used to selectively ignore colliders when casting a ray.

Returns

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

Description

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

using UnityEngine;
using System.Collections;

public class ExampleClass : MonoBehaviour {
    void Update() {
        Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);
        RaycastHit hit;
        if (Physics.Raycast(ray, out hit, 100))
            Debug.DrawLine(ray.origin, hit.point);
        
    }
}

3.Casting Rays Selectively

Cast a ray against all colliders except those in the Player layer.

void Update () {

// Bit shift the index of the layer (8) to get a bit mask

int layerMask = 1 << 8;

// This would cast rays only against colliders in layer 8.

// But instead we want to collide against everything except layer 8. The ~ operator does this, it inverts a bitmask.

layerMask = ~layerMask;

RaycastHit hit;

// Does the ray intersect any objects excluding the player layer

if (Physics.Raycast(transform.position, transform.TransformDirection (Vector3.forward), out hit, Mathf.Infinity, layerMask))

{

Debug.DrawRay(transform.position, transform.TransformDirection (Vector3.forward) * hit.distance, Color.yellow);

Debug.Log( "Did Hit" );

}

else {

Debug.DrawRay(transform.position, transform.TransformDirection (Vector3.forward) * 1000 , Color.white);

Debug.Log( "Did not Hit" );

}

4.NGUI Camera

void Update ()

{

Camera cam;

cam = UICamera.currentCamera;

Ray ray = cam . ScreenPointToRay ( Input . mousePosition );

RaycastHit hit ;

if ( Physics.Raycast(ray, out hit, 100, gameObject .layer ) )

{

Debug . Log ( "Mouse over object" );

}

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