Question

我想翻译窗口左侧的圆环，但我不知道导致它什么也没做的原因。这是一个代码：

public void display(GLAutoDrawable drawable) {
    GL2 gl2 = drawable.getGL().getGL2();
    gl2.glClear(GL2.GL_COLOR_BUFFER_BIT | GL2.GL_DEPTH_BUFFER_BIT);
    gl2.glMatrixMode(GL2.GL_PROJECTION);
    gl2.glLoadIdentity();
    gl2.glColor3f(1.0f, 0f, 0f);
    gl2.glPushMatrix();

     gl2.glTranslatef(-5.5f, -0f, -10f);
     gl2.glRotatef(30f, 1f, 1f, 1f);
     gl2.glMaterialfv(GL2.GL_FRONT_AND_BACK, GL2.GL_AMBIENT, FloatBuffer.wrap(QA_RED));
     gl2.glMaterialfv(GL2.GL_FRONT_AND_BACK, GL2.GL_DIFFUSE, FloatBuffer.wrap(QA_RED));
     gl2.glMaterialfv(GL2.GL_FRONT_AND_BACK, GL2.GL_SPECULAR, FloatBuffer.wrap(QA_WHITE));
     gl2.glMaterialfv(GL2.GL_FRONT_AND_BACK, GL2.GL_SHININESS, FloatBuffer.wrap(new float[]{30f}));
     gl2.glMaterialfv(GL2.GL_FRONT_AND_BACK, GL2.GL_AMBIENT, FloatBuffer.wrap(QA_RED));
     gl2.glMaterialfv(GL2.GL_FRONT_AND_BACK, GL2.GL_DIFFUSE, FloatBuffer.wrap(QA_RED));
     gl2.glMaterialfv(GL2.GL_FRONT_AND_BACK, GL2.GL_SPECULAR, FloatBuffer.wrap(QA_WHITE));
     gl2.glMaterialfv(GL2.GL_FRONT_AND_BACK, GL2.GL_SHININESS, FloatBuffer.wrap(new float[]{30f}));

    glut.glutSolidTorus(0.1f, 0.2f, 10, 20);

    gl2.glFlush();
}

如果我添加翻译方法torus消失，如果不是，我无法将其翻译为左侧。请问我有什么建议可以解决吗？

Answer 1

如果您试图移动圆环，我怀疑您想要修改模型视图而不是投影矩阵。加载一个较大的正交投影矩阵，glOrtho为两边提供更大的值，这样您就可以更好地看到圆环。然后确保切换到模型视图来操作它：

gl2.glMatrixMode(GL2.GL_PROJECTION);
gl2.glOrtho(100.0f, 100.0f, 100.0f, 100.0f, 0.1f, 100.0f);

gl2.glMatrixMode(GL2.GL_MODELVIEW);
gl2.glLoadIdentity();

gl2.glTranslatef...etc

JOGL过度翻转

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