jMonkeyEngine译文 FlagRush9(1)——墙壁检测系统(Detection System)

注:本系列教程全部翻译完之后可能会以PDF的形式发布。

如果有什么错误可以到http://blog.csdn.net/kakashi8841留言或EMAIL[email protected]给我。

 

jME版本 jME_2.0.1_Stable

开发工具:MyEclipse8.5

开发环境:Window7/Vista

 

 

 

9.1、介绍

在这个向导中,我们将通过冲突检测(Collision Detection,也叫碰撞检测,碰撞检查,冲突检查等)保证我们呆在一个fence。我将通过为Collision Detection增加一个新的接口来实现。这种方式,我们有几种不同的Collision Detection系统。像反弹(bounce)墙和冲撞(crash)墙。

         而最后,我不是会巫术的猴子(mojomonkey),所以这将和其它向导不同。

9.2、冲突(Collision)接口

         首先,我们增加一个接口去知道我们需要注意哪里。所以我们需要知道player和我们寻找的目标。而Collision Detector需要知道下一步发生什么。我们也准备必要的例子用于产生更好的效果。

         我们先创建一个类:CollisionDetection,里面有2个方法:

 

    public CollisionDetection(

           Vehicle player, Node target, int nextMove){

       this.player = player;

       this.target = target;

       this.nextMove = nextMove;

       this.zExtent = ((BoundingBox)(player.getWorldBound())).zExtent;

       createParticles();

    }

   

    public CollisionDetection(

           Vehicle player, Spatial target, int nextMove){

       this.player = player;

       this.target = (Node) target;

       this.nextMove = nextMove;

       this.zExtent = ((BoundingBox)(player.getWorldBound())).zExtent;

       createParticles();

    }

 

nextMove现在只有2种类型:

   

        public static final int MOVE_BOUNCE_OFF = 0;

        public static final int MOVE_STOP = 1;

 

         所以你现在可以输入这个如果你想要vehicle撞在fence后反弹的话:

         增加一个类变量:

 

        private CollisionDetection bounce;

 

         initGamebuildPlayerbuildEnvironment方法后)中加入:

 

             bounce = new CollisionDetection(

              player, walls, CollisionDetection. MOVE_BOUNCE_OFF

       );

        

         你现在看到那里有个nodewalls)还没有被定义。我将在之后再做。因为你将一个新的bounce墙放入游戏中所需要做的就是,将墙(fenceattachNode walls

         增加一个类变量:

                 

        private Node walls;

 

         然后像这样:

 

             private void buildEnvironment() {

       //这将是所有walls的主要结点

       walls = new Node("bouncing walls");

       scene.attachChild(walls);

      

       fence = new ForceFieldFence("forceFieldFence");

 

       //我们将手工做一些调整去让它更好适应terrain

       //首先我们将实体模型放大

       fence.setLocalScale(5);

       //现在,让我们移动fenceterrain的高度并有一点陷入它里面

       fence.setLocalTranslation(

           new Vector3f(25,tb.getHeight(25,25)+10,25)   

       );

      

       //这里我们将它(fenceattachwalls Node

       walls.attachChild(fence);

    }

 

9.3、墙壁Detection System

         这是我创建的一个小的detection system。它在游戏中将vehicle弹回。而另一个detection直接停止vehicle

   

    //这里处理你所有的冲突

    public void processCollisions(){

       if(nextMove == MOVE_STOP){

           if(player.hasCollision(target,false)){

              if(

                     player.getFrontwheel()

                         .hasCollision(target, false)

              ){

                  player.setMaxSpeed(0);

                  player.setMinSpeed(15);

              }else if(

                     player.getBackwheel()

                         .hasCollision(target, false)

              ){

                  player.setMaxSpeed(25);

                  player.setMinSpeed(0);

              }

           }else{

              player.setMaxSpeed(25);

              player.setMinSpeed(15);

           }

       }else if(nextMove == MOVE_BOUNCE_OFF){

           if(player.hasCollision(target,false))

              if(

                     player.getFrontwheel()

                     .hasCollision(target, false)

              ){

                  player.setVelocity(

                         -Math.abs(player.getVelocity())

                  );

                  particleGeom.setLocalTranslation(

                         player.getFrontwheel()

                            .getLocalTranslation().x,

                         player.getFrontwheel()

                            .getLocalTranslation().y*0.0025f,

                         zExtent

                  );

                  particleGeom.forceRespawn();

              }else if(

                     player.getBackwheel()

                     .hasCollision(target, false)

              ){

                  player.setVelocity(

                         Math.abs(player.getVelocity())

                  );

                  particleGeom.setLocalTranslation(

                         player.getFrontwheel()

                            .getLocalTranslation().x,

                         player.getFrontwheel()

                            .getLocalTranslation().y*0.0025f,

                         -zExtent

                  );

                  particleGeom.forceRespawn();

              }

       }

    }

 

上面的particleGeom为类变量:

   

        private ParticleSystem particleGeom;

 

9.4、粒子

         为了有一个好的冲突,你需要火花。我们将使用ParticleSystem创建这些。我尝试几次得出这些数字让它看起来更好。

 

private void createParticles() {

    particleGeom = ParticleFactory.buildParticles("collsion", 300);

    particleGeom.addInfluence(

            SimpleParticleInfluenceFactory

               .createBasicGravity(

                      new Vector3f(0, -0.01f, 0), true

               )

    );

    particleGeom.setEmissionDirection(

            new Vector3f(0.0f, 1.0f, 0.0f)

    );

    particleGeom.setMaximumAngle(360f * FastMath.DEG_TO_RAD);

    particleGeom.setMinimumLifeTime(2000.0f);

    particleGeom.setMaximumLifeTime(4000.0f);

    particleGeom.setInitialVelocity(.004f);

    particleGeom.recreate(FastMath.nextRandomInt(6, 20));

    particleGeom.setStartSize(.05f);

    particleGeom.setEndSize(.02f);

    particleGeom.setStartColor(

            new ColorRGBA(1.0f, 0.796875f, 0.1992f, 1.0f)

    );

    particleGeom.setEndColor(

            new ColorRGBA(1.0f, 1.0f, 0.5976f, 1.0f)

    );

    particleGeom.getParticleController().setRepeatType(

            Controller.RT_CLAMP

    );

 

    BlendState as = (BlendState) particleGeom.getRenderState(

                      RenderState.StateType.Blend

                   );

    if (as == null) {

        as = DisplaySystem.getDisplaySystem().getRenderer()

             .createBlendState();

        as.setBlendEnabled(true);

        as.setSourceFunction(BlendState.SourceFunction.SourceAlpha);

        as.setTestEnabled(true);

        as.setTestFunction(BlendState.TestFunction.GreaterThan);

        particleGeom.setRenderState(as);

        particleGeom.updateRenderState();

    }

    as.setDestinationFunction(BlendState.DestinationFunction.One);

    TextureState ts = DisplaySystem.getDisplaySystem()

        .getRenderer().createTextureState();

    ts.setTexture(

            TextureManager.loadTexture(

                   CollisionDetection.class.getClassLoader().getResource(

                          "res/flaresmall.jpg"

                   ),

                   Texture.MinificationFilter.BilinearNearestMipMap,

                   Texture.MagnificationFilter.Bilinear

            )

    );

    particleGeom.setRenderState(ts);

 

    player.attachChild(particleGeom);

    particleGeom.updateRenderState();

}

 

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