Libgdx的貼花命中測試

Question

我正在使用Decal類（請參閱https://code.google.com/p/libgdx-users/wiki/Decals）渲染我的場景，我需要測試一個用戶是否點擊了其中一個貼花，類似於它爲演員實施的方式在階段。

是否有這樣的命中測試的實現？如果不是，libgdx中是否有低級API可以幫助我實現它？

Answer 1

我有使用onTouch（），可以很容易地改變了鼠標事件的好方法，

Decal decal1 = Decal.newDecal(1, 1, textures[1], true); 
    decal1.setPosition(1.5f, 0, .5f); 
    decals.add(decal1); 
    Decal decal2 = Decal.newDecal(1, 1, textures[0], true); 
    decal2.setPosition(1f, 0, .5f); 
    decals.add(decal2); 
    decal2.translate(0, 0, 1f); 
//... 
for (int i = 0; i < positions.length; i++) { 
     positions[i] = new Vector3(decal1.getPosition()); 
     new Vector3(decal2.getPosition()); 
    } 
    positions[0].set(decal1.getPosition()); 
    positions[1].set(decal2.getPosition()); 
    renderer = new ImmediateModeRenderer10(); 
       Vector3 intersection = new Vector3(); 


//render method 
    Ray pickRay = null; 
    renderTowers(); 
    camera3d.update(); 
    if (Gdx.input.isTouched()) { 
     pickRay = camera3d.getPickRay(Gdx.input.getX(), Gdx.input.getY(), 
       TB_X, TB_Y, TB_WIDTH, TB_HEIGHT); 
    } 
    boolean intersected1 = false; 
    boolean intersected2 = false; 
    for (int i = 0; i < positions.length; i++) { 
     if (pickRay != null 
       && Intersector.intersectRaySphere(pickRay, positions[0], 
         .5f, intersection)) { 

      gl.glColor4f(1, 0, 0, 1); 
      intersected1 = true; 

     } else { 
      gl.glColor4f(1, 1, 1, 1); 
     } 
     gl.glPushMatrix(); 
     gl.glTranslatef(positions[i].x, positions[i].y, positions[i].z); 
     gl.glPopMatrix(); 
    } 
    for (int j = 0; j < positions.length; j++) { 
     if (pickRay != null 
       && Intersector.intersectRaySphere(pickRay, positions[1], 
         .5f, intersection)) { 

      gl.glColor4f(1, 0, 0, 1); 
      intersected2 = true; 

     } else { 
      gl.glColor4f(1, 1, 1, 1); 
     } 
     gl.glPushMatrix(); 
     gl.glTranslatef(positions[j].x, positions[j].y, positions[j].z); 
     gl.glPopMatrix(); 
    } 

    Gdx.gl.glViewport(0, 0, Gdx.graphics.getWidth(), 
      Gdx.graphics.getHeight()); 
    sbatch.begin(); 
    if (intersected1) { 
     stage.addActor(FireImage); 
     camera3d.project(intersection, TB_X, TB_Y, TB_WIDTH, TB_HEIGHT); 

    } 
    if (intersected2) { 
     stage.addActor(IceImage); 
     camera3d.project(intersection, TB_X, TB_Y, TB_WIDTH, TB_HEIGHT); 

    } 

不是很乾淨，但現在工程，這部分是從一些優秀的在線教程上取在LIBGDX所有功勞都歸功於他們！我只是定製了一些貼花。希望它有幫助，如果你想出一個更清潔的方法，我相信有一個請發佈，我很樂意看到它。