Bootcamp 浅析

M4枪 射击特效

代码：Gun.js

    function GenerateGraphicStuff(hit : RaycastHit)

    {

        var hitType : HitType;

        

        var body : Rigidbody = hit.collider.rigidbody;

        if(body == null)

        {

            if(hit.collider.transform.parent != null)

            {

                body = hit.collider.transform.parent.rigidbody;

            }

        }

        

        if(body != null)

        {

            if(body.gameObject.layer != 10 && !body.gameObject.name.ToLower().Contains("door"))

            {

                body.isKinematic = false;

            }

        

            if(!body.isKinematic)

            {

                    var direction : Vector3 = hit.collider.transform.position - weaponTransformReference.position;

                body.AddForceAtPosition(direction.normalized * pushPower, hit.point, ForceMode.Impulse);

            }

        }

        

        var go : GameObject;

        

        var delta : float = -0.02;

        var hitUpDir : Vector3 = hit.normal;

        var hitPoint : Vector3 = hit.point + hit.normal * delta;

        

        switch(hit.collider.tag)

        {

            case "wood":

                hitType = HitType.WOOD;

                go = GameObject.Instantiate(woodParticle, hitPoint, Quaternion.FromToRotation(Vector3.up, hitUpDir)) as GameObject;

                break;

            case "metal":

                hitType = HitType.METAL;

                go = GameObject.Instantiate(metalParticle, hitPoint, Quaternion.FromToRotation(Vector3.up, hitUpDir)) as GameObject;

                break;

            case "car":

                hitType = HitType.METAL;

                go = GameObject.Instantiate(metalParticle, hitPoint, Quaternion.FromToRotation(Vector3.up, hitUpDir)) as GameObject;

                break;

            case "concrete":

                hitType = HitType.CONCRETE;

                go = GameObject.Instantiate(concreteParticle, hitPoint, Quaternion.FromToRotation(Vector3.up, hitUpDir)) as GameObject;

                break;

            case "dirt":

                hitType = HitType.CONCRETE;

                go = GameObject.Instantiate(sandParticle, hitPoint, Quaternion.FromToRotation(Vector3.up, hitUpDir)) as GameObject;

                break;

            case "sand":

                hitType = HitType.CONCRETE;

                go = GameObject.Instantiate(sandParticle, hitPoint, Quaternion.FromToRotation(Vector3.up, hitUpDir)) as GameObject;

                break;

            case "water":

                go = GameObject.Instantiate(waterParticle, hitPoint, Quaternion.FromToRotation(Vector3.up, hitUpDir)) as GameObject;

                break;

            default:

                return;

        }

        

        go.layer = hit.collider.gameObject.layer;

        

        if(hit.collider.renderer == null) return;

        

        if(timerToCreateDecal < 0.0 && hit.collider.tag != "water")

        {

            go = GameObject.Instantiate(bulletMark, hit.point, Quaternion.FromToRotation(Vector3.forward, -hit.normal));

            var bm : BulletMarks = go.GetComponent("BulletMarks");

            bm.GenerateDecal(hitType, hit.collider.gameObject);

            timerToCreateDecal = 0.02;

        }

    }

分析：根据枪射击到不同的材质，实例化不同的特效

子弹打在材质上表面留下的痕迹：

贴花系统，没怎么看明白，Decal System

http://game.ceeger.com/Components/shader-NormalDecal.html

http://docs.unity3d.com/Documentation/ScriptReference/RaycastHit-textureCoord.html

查看BulletMarks.js 重点部分代码：

#pragma strict

#pragma implicit

#pragma downcast



enum HitType

{

    CONCRETE,

    WOOD,

    METAL,

    OLD_METAL,

    GLASS,

    GENERIC

}



class BulletMarks extends MonoBehaviour

{

    public var concrete : Texture2D[];

    public var wood : Texture2D[];

    public var metal : Texture2D[];

    public var oldMetal : Texture2D[];

    public var glass : Texture2D[];

    public var generic : Texture2D[];

    

    public function GenerateDecal(type : HitType, go : GameObject) 

    {

        var useTexture : Texture2D;

        var random : int;

        switch(type)

        {

            case HitType.GENERIC:

                if(generic == null) return;

                if(generic.Length == 0) return;

                

                random = Random.Range(0, generic.Length);

                

                useTexture = generic[random];

                break;

            .......

            default:

                if(wood == null) return;

                if(wood.Length == 0) return;

                

                random = Random.Range(0, wood.Length);

                

                useTexture = wood[random];

                return;

        }

        

        transform.Rotate(new Vector3(0, 0, Random.Range(-180.0, 180.0)));



        Decal.dCount++;

        var d : Decal = gameObject.GetComponent("Decal");

        d.affectedObjects = new GameObject[1];

        d.affectedObjects[0] = go;

        d.decalMode = DecalMode.MESH_COLLIDER;

        d.pushDistance = 0.009 + BulletMarkManager.Add(gameObject);

        var m : Material = new Material(d.decalMaterial);

        m.mainTexture = useTexture;

        d.decalMaterial = m;

        d.CalculateDecal();

        d.transform.parent = go.transform;

    }