Unity Sample Bootcamp

M4枪 射击特效

Gun.js源码

    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

子弹打到的痕迹

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

文档资料

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

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

BulletMarks.js 重点代码

#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;
    }

贴图