JPCT-AE for Android 3D (二)———-為立方體各面貼上不同的紋理

     Primitives.getCube(10)雖然能夠很方便的建立立方體，但是其支援的紋理映射方式還比較單一。下面將介紹一下如何自己建立立方體並為立方體的各個面都貼上不同的問題了。

這裡我們使用上一篇文章中的代碼，在CBoxRander中加入如下兩個函數：

// 建立紋理private void CreateTextures() {Texture texture = new Texture(BitmapHelper.rescale(BitmapHelper.convert(mActivity.getResources().getDrawable(R.drawable.yi)), 64, 64));TextureManager.getInstance().addTexture("yi", texture);texture = new Texture(BitmapHelper.rescale(BitmapHelper.convert(mActivity.getResources().getDrawable(R.drawable.shi)), 64, 64));TextureManager.getInstance().addTexture("shi", texture);texture = new Texture(BitmapHelper.rescale(BitmapHelper.convert(mActivity.getResources().getDrawable(R.drawable.zhu)), 64, 64));TextureManager.getInstance().addTexture("zhu", texture);texture = new Texture(BitmapHelper.rescale(BitmapHelper.convert(mActivity.getResources().getDrawable(R.drawable.xing)), 64, 64));TextureManager.getInstance().addTexture("xing", texture);texture = new Texture(BitmapHelper.rescale(BitmapHelper.convert(mActivity.getResources().getDrawable(R.drawable.wan)), 64, 64));TextureManager.getInstance().addTexture("wan", texture);texture = new Texture(BitmapHelper.rescale(BitmapHelper.convert(mActivity.getResources().getDrawable(R.drawable.wen)), 64, 64));TextureManager.getInstance().addTexture("wen", texture);}

private void CreateBox() {cube = new Object3D(12);// 前cube.addTriangle(GetPoint(-30, -30, 30), 0.0f, 0.0f,GetPoint(30, -30, 30), 1.0f, 0.0f, GetPoint(-30, 30, 30), 0.0f,1.0f, TextureManager.getInstance().getTextureID("yi"));cube.addTriangle(GetPoint(30, -30, 30), 1.0f, 0.0f,GetPoint(30, 30, 30), 1.0f, 1.0f, GetPoint(-30, 30, 30), 0.0f,1.0f, TextureManager.getInstance().getTextureID("yi"));// 上cube.addTriangle(GetPoint(-30, 30, 30), 0.0f, 0.0f,GetPoint(30, 30, 30), 1.0f, 0.0f, GetPoint(-30, 30, -30), 0.0f,1.0f, TextureManager.getInstance().getTextureID("shi"));cube.addTriangle(GetPoint(30, 30, 30), 1.0f, 0.0f,GetPoint(30, 30, -30), 1.0f, 1.0f, GetPoint(-30, 30, -30),0.0f, 1.0f, TextureManager.getInstance().getTextureID("shi"));// 後cube.addTriangle(GetPoint( -30, 30, -30), 0.0f, 0.0f,GetPoint(30, 30, -30), 1.0f, 0.0f, GetPoint(-30, -30, -30),0.0f, 1.0f, TextureManager.getInstance().getTextureID("zhu"));cube.addTriangle(GetPoint(30, 30, -30), 1.0f, 0.0f,GetPoint(30, -30, -30), 1.0f, 1.0f, GetPoint(-30, -30, -30),0.0f, 1.0f, TextureManager.getInstance().getTextureID("zhu"));// 下cube.addTriangle(GetPoint(-30, -30, -30), 0.0f, 0.0f,GetPoint(30, -30, -30), 1.0f, 0.0f, GetPoint(-30, -30, 30),0.0f, 1.0f, TextureManager.getInstance().getTextureID("xing"));cube.addTriangle(GetPoint(30, -30, -30), 1.0f, 0.0f,GetPoint(30, -30, 30), 1.0f, 1.0f, GetPoint( -30, -30, 30), 0.0f,1.0f, TextureManager.getInstance().getTextureID("xing"));// 左cube.addTriangle(GetPoint( -30, -30, -30), 0.0f, 0.0f,GetPoint(-30, -30, 30), 1.0f, 0.0f, GetPoint(-30, 30, -30),0.0f, 1.0f, TextureManager.getInstance().getTextureID("wan"));cube.addTriangle(GetPoint( -30, -30, 30), 1.0f, 0.0f,GetPoint(-30, 30, 30), 1.0f, 1.0f, GetPoint(-30, 30, -30),0.0f, 1.0f, TextureManager.getInstance().getTextureID("wan"));// 右cube.addTriangle(GetPoint(30, -30, 30), 0.0f, 0.0f,GetPoint(30, -30, -30), 1.0f, 0.0f, GetPoint(30, 30, 30), 0.0f,1.0f, TextureManager.getInstance().getTextureID("wen"));cube.addTriangle(GetPoint(30, -30, -30), 1.0f, 0.0f,GetPoint(30, 30, -30), 1.0f, 1.0f, GetPoint(30, 30, 30), 0.0f,1.0f, TextureManager.getInstance().getTextureID("wen"));cube.strip();cube.build();world.addObject(cube);cube.setCulling(false);cube.scale( 0.4f);cube.rotateZ( 180);}

然後將onSurfaceCreated修改為：

@Overridepublic void onSurfaceCreated(GL10 gl, EGLConfig config) {// TODO Auto-generated method stubworld = new World();world.setAmbientLight(100, 100, 100);sun = new Light(world);sun.setIntensity(250, 250, 250);sun.setPosition( GetPoint( 0, 0, -150));sun.setDiscardDistance( 500);// 紋理CreateTextures();// 立方體CreateBox();// 攝像機cam = world.getCamera();cam.moveCamera(Camera.CAMERA_MOVEOUT, 50);cam.lookAt(cube.getTransformedCenter());SimpleVector sv = new SimpleVector();sv.set(cube.getTransformedCenter());sv.y -= 100;sv.z -= 100;sun.setPosition(sv);MemoryHelper.compact();}