Question

我有一个简单的OpenGl es cube，在Android上运行。我已经设置了一个简单的旋转，但现在我想缩放对象。我认为添加一个比例矩阵并将其与我对其他矩阵相乘，会产生预期的结果。无论如何，它没有。这是班级

public class Render implements Renderer  {

    //fields

    private Triang tri;
    private Quad qua;
    private Cube cu;

    private float [] mIden = new float[16];
    private float [] mPro = new float [16];
    private float [] mCamera = new float [16];
    private float [] mResult = new float [16];
    private float [] mResult2 = new float [16];
    private float [] mResult3 = new float [16];
    private float [] mRot = new float [16];
    private float [] mScale = new float [16];
    private float an;

    //methods


    public void onSurfaceCreated(GL10 unused, EGLConfig config) {
        GLES20.glClearColor(0.0f, 1.0f, 0.0f, 1.0f);
        tri = new Triang();
        qua = new Quad();
        cu = new Cube();

    }

//I think the problem is in this Ondraw frame method

    public void onDrawFrame(GL10 unused) {
        GLES20.glClear(GLES20.GL_COLOR_BUFFER_BIT | GLES20.GL_DEPTH_BUFFER_BIT);
        Matrix.setLookAtM(mCamera, 0, i, 0f, -3f, 0f, 0f, 0f, 0f, 1f, 0f);

    long tempo = SystemClock.uptimeMillis() % 4000L;
        float an = 0.090f * ((int)tempo);

        public void onDrawFrame(GL10 unused) {
    GLES20.glClear(GLES20.GL_COLOR_BUFFER_BIT | GLES20.GL_DEPTH_BUFFER_BIT);
    Matrix.setIdentityM(mIden, 0);
    Matrix.setLookAtM(mCamera, 0, i, 0f, -3f, 0f, 0f, 0f, left, up, z);
    long tempo = SystemClock.uptimeMillis() % 4000L;
    float an = 0.090f * ((int)tempo);
    Matrix.multiplyMM(mResult, 0, mPro, 0, mCamera, 0);
    Matrix.scaleM(mScale, 0, 10.1f, 1f, 1f);
    Matrix.multiplyMM(mResult2, 0, mScale, 0, mResult, 0);
    Matrix.setRotateM(mRot, 0, an, 0f, 1f, 0);
    Matrix.multiplyMM(mResult3, 0, mRot, 0, mResult, 0);

    //qua.draw(mResult2);
    //tri.draw(mResult2);
    cu.draw(mResult3);

        //qua.draw(mResult2);
        //tri.draw(mResult2);
        cu.draw(mResult3);


    }


    public void onSurfaceChanged(GL10 unused, int width, int height) {
        GLES20.glViewport(0, 0, width, height);

        float ratio = (float) width/height;

        Matrix.frustumM(mPro, 0, ratio, -ratio, -1, 1, 1, 10);

    }

    public static int loadShader (int tipo, String code) {

        int shader = GLES20.glCreateShader(tipo);
        GLES20.glShaderSource(shader, code);
        GLES20.glCompileShader(shader);

        return shader;


    }



}

我尝试更改mScale和mResult2的顺序，在上一次编辑中，我还设置了模型标识，但多维数据集的大小没有变化。

Opengl es 2.将比例矩阵与旋转矩阵相结合

0 个答案: