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UnityAPI_RaycastHit_V01_1.0

严立钻

2020.05.22

立钻哥哥：Unity是一个入门快、提高难的游戏引擎，想要提升能力，至少需要越过3道坎：API+Shader+综合能力；

++1、API的积累：对API的合理利用不仅可以减轻自己的编码负担，而且往往可以提高程序的运行效率；这也是钻哥开始“Unity API”独立打造分类的初衷；

++2、Shader编程：想要做出一款精品游戏往往需要有高效的Shader的支持；Unity提供了一套改良的“Shader Lab”系统，优化了繁杂的“Open GL”编程；

++3、综合能力（技术+业务+管理）：一款产品的制作除了功能编程外，往往会涉及很多其他领域，例如产品架构、UI交互设计、模型制作等，作为主要的编程人员，对其他相关领域的了解程序往往会影响到产品制作直至最后的产品体验；

++++立钻哥哥一直在推动【VR云游戏=Unity+SteamVR+云技术+5G+AI】，这个只是一个引子，抛砖引玉让大家对整个知识体系有一个明确的落地方向，宝宝们可以根据自己的兴趣方向进行拓展：比如Unity这里是指一种“3D游戏引擎”，也可拓展至“UE4、Cocos2dx”等游戏引擎；SteamVR是一种跨硬件解决方案，也可拓展至“VRTK”等第三方插件；“云技术+5G”是一种跨平台解决方案的核心技术，同样可拓展至其他平台解决方案；AI也是一种先进技术的举例，也可以拓展至任何一种前沿技术；

#RaycastHit射线投射碰撞信息

#RaycastHit射线投射碰撞信息

++A1、Description描述

++B2、Variables变量

++C3、Public Function共有函数

++D4、Message消息

#A1、Description描述

立钻哥哥：Structure used to get information back from a raycast.

#B2、Variables变量

++B2、Variables变量

++++B2.1、barycentricCoordinate

++++B2.2、collider

++++B2.3、distance

++++B2.4、lightmapCoord

++++B2.5、normal

++++B2.6、point

++++B2.7、rigidbody

++++B2.8、textureCoord

++++B2.9、textureCoord2

++++B2.10、transform

++++B2.11、triangleIndex

++++B2.12、YanlzXREngine.RaycastHit.Variables

++B2.1、barycentricCoordinate

public Vector3 barycentricCoordinate;

using UnityEngine;

using System.Collections;

using YanlzXREngine;

public class YanlzRaycastHit : MonoBehaviour{

    void Update(){

        RaycastHit hit;

        if(!Physics.Raycast(Camera.main.ScreenPointToRay(Input.mousePosition), out hit)){

            return;

        }

        MeshCollider meshCollider = hit.collider as MeshCollider;

        if(meshCollider == null || meshCollider.sharedMesh == null){

            return;

        }

        Mesh mesh = meshCollider.sharedMesh;

        Vector3[] normals = mesh.normals;

        int[] triangles = mesh.triangles;

        Vector3 n0 = normals[triangles[hit.triangleIndex * 3 + 0]];

        Vector3 n1 = normals[triangles[hit.triangleIndex * 3 + 1]];

        Vector3 n2 = normals[triangles[hit.triangleIndex * 3 + 2]];

        Vector3 baryCenter = hit.barycentricCoordinate;

        Vector3 interpolatedNormal = n0 * baryCenter.x + n1 * baryCenter.y + n2 * baryCenter.z;

        interpolatedNormal = interpolatedNormal.normalized;

        Transform hitTransform = hit.collider.transform;

        interpolatedNormal = hitTransform.TransformDirection(interpolatedNormal);

        Debug.DrawRay(hit.point, interpolatedNormal);

    }    //立钻哥哥：void Update(){}

}    //立钻哥哥：public class YanlzRaycastHit{}

++B2.2、collider

public Collider collider;

using UnityEngine;

using System.Collections;

using YanlzXREngine;

public class YanlzRaycastHit : MonoBehaviour{

    void Update(){

        if(Input.GetMouseButtonDown(0)){

            RaycastHit hit;

            Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);

            if(Physics.Raycast(ray, out hit)){

                hit.collider.enabled = false;

            }

        }    //立钻哥哥：if(){}

    }    //立钻哥哥：void Update(){}

}    //立钻哥哥：public class YanlzRaycastHit{}

++B2.3、distance

public float distance;

using UnityEngine;

using System.Collections;

using YanlzXREngine;

public class YanlzRaycastHit : MonoBehaviour{

    public float moveForce = 1.0F;

    public float rotateTorque = 1.0F;

    public float hoverHeight = 4.0F;

    public float hoverForce = 5.0F;

    public float hoverDamp = 0.5F;

    public Rigidbody rb;

    void Start(){

        rb = GetComponent<Rigidbody>();

        rb.drag = 0.5F;

        rb.angularDrag = 0.5F;

    }    //立钻哥哥：void Start(){}

    void FixedUpdate(){

        rb.AddForce(Input.GetAxis(“Vertical”) * moveForce * transform.forward);

        rb.AddTorque(Input.GetAxis(“Horizontal”) * rotateTorque * Vector3.up);

        RaycastHit hit;

        Ray downRay = new Ray(transform.position, -Vector3.up);

        if(Physics.Raycast(downRay, out hit)){

            float hoverError = hoverHeight - hit.distance;

            if(hoverError > 0){

                float upwardSpeed = rb.velocity.y;

                float lift = hoverError * hoverForce - upwardSpeed * hoverDamp;

                rb.AddForce(lift * Vector3.up);

            }    //立钻哥哥：if(hoverError > 0){}

        }    //立钻哥哥：if(Physics.Raycast()){}

    }    //立钻哥哥：void FixedUpdate(){}

}    //立钻哥哥：public class YanlzRaycastHit{}

++B2.4、lightmapCoord

public Vector2 lightmapCoord;

++B2.5、normal

public Vector3 normal;

using UnityEngine;

using System.Collections;

using YanlzXREngine;

public class YanlzRaycastHit : MonoBehaviour{

    public Transform gunObj;

    void Update(){

        if(Input.GetMouseButton(0)){

            RaycastHit hit;

            Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);

            if(Physics.Raycast(ray, out hit)){

                Vector3 incomingVec = hit.point - gunObj.position;

                Vector3 reflectVec = Vector3.Reflect(incomingVec, hit.normal);

                Debug.DrawLine(gunObj.position, hit.point, Color.red);

                Debug.DrawRay(hit.point, reflectVec, Color.green);

            }    //立钻哥哥：if(Physics.Raycast()){}

        }    //立钻哥哥：if(Input.GetMouseButton()){}

    }    //立钻哥哥：void Update(){}

}    //立钻哥哥：public class YanlzRaycastHit{}

++B2.6、point

public Vector3 point;

using UnityEngine;

using System.Collections;

using YanlzXREngine;

public class YanlzRaycastHit : MonoBehaviour{

    public float pokeForce;

    void Update(){

        RaycastHit hit;

        Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);

        if(Physics.Raycast(ray, out hit)){

            if(hit.rigidbody != null){

                hit.rigidbody.AddForceAtPosition(ray.direction * pokeForce, hit.point);

            }    //立钻哥哥：if(hit.rigidbody != null){}

        }    //立钻哥哥：if(Physics.Raycast()){}

    }    //立钻哥哥：void Update(){}

}    //立钻哥哥：public class YanlzRaycastHit{}

++B2.7、rigidbody

public Rigidbody rigidbody;

using UnityEngine;

using System.Collections

using YanlzXREngine;

public class YanlzRaycastHit : MonoBehaviour{

    public float hitForce;

    void Update(){

        if(Input.GetMouseButtonDown(0)){

            RaycastHit hit;

            Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);

            if(Physics.Raycast(ray, out hit)){

                if(hit.rigidbody != null){

                    hit.rigidbody.AddForce(ray.direction * hitForce);

                }    //立钻哥哥：if(hit.rigidbody != null){}

            }    //立钻哥哥：if(Physics.Raycast(ray, out hit)){}

        }    //立钻哥哥：if(Input.GetMouseButtonDown()){}

    }    //立钻哥哥：void Update(){}

}    //立钻哥哥：public class YanlzRaycastHit{}

++B2.8、textureCoord

public Vector2 textureCoord;

using UnityEngine;

using System.Collections;

using YanlzXREngine;

public class YanlzRaycastHit : MonoBehaviour{

    public Camera cam;

    void Start(){

        cam = GetComponent<Camera>();

    }    //立钻哥哥：void Start(){}

    void Update(){

        if(!Input.GetMouseButton(0)){

            return;

        }    //立钻哥哥：if(!Input.GetMouseButton()){}

        RaycastHit hit;

        if(!Physics.Raycast(cam.ScreenPointToRay(Input.mousePosition), out hit)){

            return;

        }    //立钻哥哥：if(!Physics.Raycast()){}

        Renderer rend = hit.transform.GetComponent<Renderer>();

        MeshCollider meshCollider = hit.collider as MeshCollider;

        if(rend == null || rend.sharedMaterial == null || rend.sharedMaterial.mainTexture == null || meshCollider == null){

            return;

        }    //立钻哥哥：if(rend==null || ...){}

        Texture2D tex = rend.material.mainTexture as Texture2D;

        //Vector2 pixelUV = hit.textureCoord2;    //立钻哥哥：纹理坐标2

        Vector2 pixelUV = hit.textureCoord;

        pixelUV.x *= tex.width;

        pixelUV.y *= tex.height;

        tex.SetPixel((int)pixelUV.x, (int)pixelUV.y, Color.black);

        tex.Apply();

    }    //立钻哥哥：void Update(){}

}    //立钻哥哥：pubic class YanlzRaycastHit{}

++B2.9、textureCoord2

public Vector2 textureCoord2;

++B2.10、transform

public Transform transform;

++B2.11、triangleIndex

public int triangleIndex;

//立钻哥哥：This script draw a debug line around mesh triangles as you move the mouse over them

using UnityEngine;

using System.Collections;

using YanlzXREngine;

public class YanlzXREngine : MonoBehaviour{

    Camera camera;

    void Start(){

        camera = GetComponent<Camera>();

    }    //立钻哥哥：void Start(){}

    void Update(){

        RaycastHit hit;

        if(!Physics.Raycast(camera.ScreenPointToRay(Input.mousePosition), out hit)){

            return;

        }    //立钻哥哥：if(!Physics.Raycast()){}

        MeshCollider meshCollider = hit.collider as MeshCollider;

        if(meshCollider == null || meshCollider.sharedMesh == null){

            return;

        }    //立钻哥哥：if(meshCollider==null || ...){}

        Mesh mesh = meshCollider.sharedMesh;

        Vector3[] vertices = mesh.vertices;

        int[] triangles = mesh.triangles;

        Vector3 p0 = vertices[triangles[hit.triangleIndex * 3 + 0]]

        Vector3 p1 = vertices[triangles[hit.triangleIndex * 3 + 1]];

        Vector3 p2 = vertices[triangles[hit.triangleIndex * 3 + 2]]

        Transform hitTransform = hit.collider.transform;

        p0 = hitTransform.TransformPoint(p0);

        p1 = hitTransform.TransformPoint(p1);

        p2 = hitTransform.TransformPoint(p2);

        Debug.DrawLine(p0, p1);

        Debug.DrawLine(p1, p2);

        Debug.DrawLine(p2, p0);

    }    //立钻哥哥：void Update(){}

}    //立钻哥哥：public class YanlzXREngine{}

#C3、立钻哥哥对RaycastHit类的拓展

立钻哥哥推荐的拓展学习链接（Link_Url）