Qt OpenGL默认比例确实很奇怪
我正在研究 Qt 编程书中的 OpenGL 示例。几乎一切都工作正常，但默认比例似乎相差甚远。我应该看到一个非常标准的立方体，但我看到的是这个。
我的立方体代码如下所示：
glBegin(GL_QUADS);
//top face
qglColor(m_faceColors[0]);
glVertex3f(-m_cubeSize, m_cubeSize, -m_cubeSize);
glVertex3f(m_cubeSize, m_cubeSize, -m_cubeSize);
glVertex3f(m_cubeSize, m_cubeSize, m_cubeSize);
glVertex3f(-m_cubeSize, m_cubeSize, m_cubeSize);
// left face
qglColor(m_faceColors[1]);
glVertex3f(-m_cubeSize, -m_cubeSize, -m_cubeSize);
glVertex3f(-m_cubeSize, m_cubeSize, -m_cubeSize);
glVertex3f(-m_cubeSize, m_cubeSize, m_cubeSize);
glVertex3f(-m_cubeSize, -m_cubeSize, m_cubeSize);
依此类推...
我不会调用任何奇怪的 glScalef。我的 resizeGL() 看起来像这样：
void GLWidget::resizeGL(int width, int height)
{
glViewport(0, 0, width, height);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
m_width = (height>0) ? (GLfloat)width/height : 1;
glOrtho(-width, +width, -1.0, 1.0, -2, 2);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
}
m_cubeSize 是 1.0
无论如何，当我在 draw() 函数中执行此操作时：
glScalef(275, 0.5, 0.5);
我看到这个（看起来正确）：
有谁知道为什么默认情况下 x 比例会这么小？我完全按照书上说的做，但我真的很困惑。我之前（使用 Glut）做过相当多的 OpenGL，但这是我第一次使用 Qt 作为包装器。
I'm working on an OpenGL example out of a Qt programming book. Almost everything works fine, but the default scale seems to be way off. I should be seeing a pretty standard cube, but instead I see this.
My code for the cube looks like this:
glBegin(GL_QUADS);
//top face
qglColor(m_faceColors[0]);
glVertex3f(-m_cubeSize, m_cubeSize, -m_cubeSize);
glVertex3f(m_cubeSize, m_cubeSize, -m_cubeSize);
glVertex3f(m_cubeSize, m_cubeSize, m_cubeSize);
glVertex3f(-m_cubeSize, m_cubeSize, m_cubeSize);
// left face
qglColor(m_faceColors[1]);
glVertex3f(-m_cubeSize, -m_cubeSize, -m_cubeSize);
glVertex3f(-m_cubeSize, m_cubeSize, -m_cubeSize);
glVertex3f(-m_cubeSize, m_cubeSize, m_cubeSize);
glVertex3f(-m_cubeSize, -m_cubeSize, m_cubeSize);
And so on...
I'm not calling any weird glScalef's. My resizeGL() looks like this:
void GLWidget::resizeGL(int width, int height)
{
glViewport(0, 0, width, height);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
m_width = (height>0) ? (GLfloat)width/height : 1;
glOrtho(-width, +width, -1.0, 1.0, -2, 2);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
}
m_cubeSize is 1.0
Anyway, when I do this in the draw() function:
glScalef(275, 0.5, 0.5);
I see this (looks correct):
Does anyone know why the x scale would be so small by default? I'm doing exactly what the book says, but I'm really confused. I've done quite a bit of OpenGL before (with Glut), but this is my first time using Qt as a wrapper.
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评论（1）
您到底期望这个
做什么？这样做不是更有意义吗：
What exactly do you expect this:
to do? Wouldn't it make more sense to do something like this: