Question

我正在尝试制作一个场景，我正在看着XY平面，Z朝向和远离摄像机视图。我希望看到的物体距离我脸前的物体不同，所以我想我应该使用gluPerspective。我的屏幕上应该有一些轴来自原点，但是，我根本看不到任何东西。我让它与一堆翻译工作，但我想确保我理解如何正确操作这个，因为这是所有猜测和检查之前。

void resizeWindow(GLint newWidth, GLint newHeight)
{
    glViewport(0, 0, newWidth, newHeight);
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    gluPerspective(60.0f, (GLfloat)newWidth / (GLfloat)newHeight, 0.1f, 100.0f);
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
    glMatrixMode(GL_MODELVIEW);
    glLoadIdentity();
    gluLookAt(0.0, 0.0, -1.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0);
}

glPushMatrix();
glColor4ub(0, 120, 20, 255);
glBegin(GL_LINE_STRIP);
glVertex3f(0.0f, 0.0f, 0.0f);
glVertex3f(3.0f, 0.0f, 0.0f);
glVertex3f(2.85f, 0.10f, 0.0f);
glVertex3f(2.85f, -0.10f, 0.0f);
glVertex3f(3.0f, 0.0f, 0.0f);
glVertex3f(2.85f, 0.0f, 0.10f);
glVertex3f(2.85f, 0.0f, -0.10f);
glVertex3f(3.0f, 0.0f, 0.0f);
glEnd();
glBegin(GL_LINE_STRIP);
glVertex3f(0.0f, 0.0f, 0.0f);
glVertex3f(0.0f, 3.0f, 0.0f);
glVertex3f(0.0f, 2.85f, 0.10f);
glVertex3f(0.0f, 2.85f, -0.10f);
glVertex3f(0.0f, 3.0f, 0.0f);
glVertex3f(0.10f, 2.85f, 0.0f);
glVertex3f(-0.10f, 2.85f, 0.0f);
glVertex3f(0.0f, 3.0f, 0.0f);
glEnd();
glBegin(GL_LINE_STRIP);
glVertex3f(0.0f, 0.0f, 0.0f);
glVertex3f(0.0f, 0.0f, 3.0f);
glVertex3f(0.10f, 0.0f, 2.85f);
glVertex3f(-0.10f, 0.0f, 2.85f);
glVertex3f(0.0f, 0.0f, 3.0f);
glVertex3f(0.0f, 0.10f, 2.85f);
glVertex3f(0.0f, -0.10f, 2.85f);
glVertex3f(0.0f, 0.0f, 3.0f);
glEnd();

Answer 1

没有尝试运行代码，但是快速浏览一下：

删除glPushMatrix（）。你不会在任何地方弹出它......而不是修改它们
你的眼睛＆＃34;坐标（0.0,0.0，-1.0）似乎有点太接近原始，因为你的轴的长度是3.0单位。尝试（0.0,0.0，-20.0）左右。

OpenGL场景中心问题

1 个答案: