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使用OpenGL ES我正在渲染一个简单的立方体类，将它绘制在屏幕的中心。但是，我希望能够在屏幕上随机抽取多个这样的立方体，但不知道如何进行。这是我自定义的表面视图，将多维数据集呈现为私有类。我没有包括我的主要ActivityManager，因为它不关心。在opengl中随机位置绘制多个立方体android
public class TouchSurfaceView extends GLSurfaceView {
private final float TRACKBALL_SCALE_FACTOR=52.0f;
private final float TOUCH_SCALE_FACTOR=100.0f/320;
private MyGLRenderer mRenderer;
private float mPreviousX;
private float mPreviousY;
public TouchSurfaceView(Context context) {
super(context);
// TODO Auto-generated constructor stub
mRenderer=new MyGLRenderer();
setRenderer(mRenderer);
setRenderMode(GLSurfaceView.RENDERMODE_WHEN_DIRTY);
}
private class MyGLRenderer implements GLSurfaceView.Renderer{
private MyGLCube mCube;
public float mAngleX;
public float mAngleY;
public MyGLRenderer(){
mCube=new MyGLCube();
}
@Override
public void onDrawFrame(GL10 gl) {
// TODO Auto-generated method stub
gl.glDisable(GL10.GL_DITHER);
gl.glClear(GL10.GL_COLOR_BUFFER_BIT | GL10.GL_DEPTH_BUFFER_BIT);
gl.glMatrixMode(GL10.GL_MODELVIEW);
gl.glLoadIdentity();
gl.glClientActiveTexture(DRAWING_CACHE_QUALITY_HIGH);
// gl.glTranslatef(0, 0, -3.0f);
gl.glTranslatef(0, 0, -3.0f);
gl.glRotatef(mAngleX, 0, 1, 0);
gl.glRotatef(mAngleY, 1, 0, 0);
mCube.draw(gl);
}
@Override
public void onSurfaceChanged(GL10 gl, int width, int height) {
// TODO Auto-generated method stub
gl.glViewport(0, 0, width, height);
float ratio=(float) width/height;
gl.glMatrixMode(GL10.GL_PROJECTION);
gl.glLoadIdentity();
gl.glFrustumf(-ratio, ratio, -1, 1, 1, 10);
}
@Override
public void onSurfaceCreated(GL10 gl, EGLConfig config) {
// TODO Auto-generated method stub
gl.glDisable(GL10.GL_DITHER);
gl.glHint(GL10.GL_PERSPECTIVE_CORRECTION_HINT, GL10.GL_FASTEST);
gl.glClearColor(0.5f, 2, 0.63f, 0.2f);
}
}
}
这里是MYGLCube包含顶点，索引和其他的东西构建立方体
public class MyGLCube {
private float vertices[]={
0.3f,0.3f,-0.3f, // topFront Right
0.3f,-0.3f,-0.3f, //BottomFront Right
-0.3f,-0.3f,-0.3f, //BottomFront Left
-0.3f,0.3f,-0.3f, //topFront Left
0.3f,0.3f,0.3f, // topBack Right
0.3f,-0.3f,0.3f, //BottomBack Right
-0.3f,-0.3f,0.3f, //BottomBack Left
-0.3f,0.3f,0.3f, //topBack Left
};
private float rgbaVals[]={
1,1,0,.5f, // topFront Right color
0.25f,0, 0.8f,1, //BottomFront Right color
0,1,1,1, //BottomFront Left color
0.35f,0.26f,1,0.5f, //topFront Left color
0.23f,0.62f,3,0.2f, // topBack Right color
0.3f,0.43f,1,0.2f, //BottomBack Right color
0.2f, 0.3f, 0.73f,0.6f, //BottomBack Left color
0.6f, 0.9f, 0.65f, 0.2f //topBack Left color
};
private short pIndex[]={
3,4,0, 0,4,1, 3,0,1,
3,7,4, 7,6,4, 7,3,6,
3,1,2, 1,6,2, 6,3,2,
1,4,5, 5,6,1, 6,5,4
};
private FloatBuffer vertBuff, cBuff;
private ShortBuffer pBuff;
public MyGLCube(){
ByteBuffer bBuff=ByteBuffer.allocateDirect(vertices.length*4);
bBuff.order(ByteOrder.nativeOrder());
vertBuff=bBuff.asFloatBuffer();
vertBuff.put(vertices);
vertBuff.position(0);
ByteBuffer pbBuff=ByteBuffer.allocateDirect(pIndex.length*2);
pbBuff.order(ByteOrder.nativeOrder());
pBuff=pbBuff.asShortBuffer();
pBuff.put(pIndex);
pBuff.position(0);
ByteBuffer colorBuff=ByteBuffer.allocateDirect(rgbaVals.length*4);
colorBuff.order(ByteOrder.nativeOrder());
cBuff=colorBuff.asFloatBuffer();
cBuff.put(rgbaVals);
cBuff.position(0);
}
public void draw(GL10 gl){
gl.glFrontFace(GL10.GL_CW);
gl.glEnable(GL10.GL_CULL_FACE);
gl.glEnable(GL10.GL_SMOOTH);
gl.glEnable(GL10.GL_DEPTH_TEST);
gl.glCullFace(GL10.GL_BACK);
gl.glEnableClientState(GL10.GL_VERTEX_ARRAY);
gl.glEnableClientState(GL10.GL_COLOR_ARRAY);
gl.glVertexPointer(3, GL10.GL_FLOAT, 0, vertBuff);
gl.glColorPointer(4, GL10.GL_FLOAT, 0, cBuff);
gl.glDrawElements(GL10.GL_TRIANGLES, pIndex.length, GL10.GL_UNSIGNED_SHORT, pBuff);
gl.glDisableClientState(GL10.GL_COLOR_ARRAY);
gl.glDisableClientState(GL10.GL_VERTEX_ARRAY);
gl.glDisable(GL10.GL_CULL_FACE);
}
}
我没有画任何东西。我必须在最后一个多维数据集绘图之后删除gl.PopMatrix（）。它应该工作而不会被删除？ – 2016-02-06 18:38:00
@Mitulátbáti，gl.PopMatrix（）调用的次数应该与glPushMatrix（）相同，如果代码中某处存在pushmatrix而没有正确的popmatrix – SteveL 2016-02-07 10:13:51
生成1000个多维数据集并且它可以工作。但有了这3个，当3-3 pop/pushmatrix时它仍然不起作用。我不明白为什么...谢谢。 – 2016-02-07 18:16:59