JOGL glut torus 翻译

Question

我想平移 window 左侧的环面，但我不知道是什么原因导致它什么也没做。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圆环消失，否则我无法将其翻译到左侧。请给我任何建议如何解决它？

Answer 1

我怀疑如果您试图移动环面，您想要修改模型视图而不是投影矩阵。使用 glOrtho 加载更大的正交投影矩阵，为边提供更大的值，以便您可以更好地看到环面。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 glut torus 翻译

JOGL glut torus translate

opengl

glut

jogl