opengl立方体一点透视图
时间: 2023-07-28 17:10:37 浏览: 59
要在OpenGL中绘制一个具有透视效果的立方体,可以使用透视投影矩阵。以下是使用OpenGL的固定管线实现的示例代码:
```
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluPerspective(45.0f, (GLfloat)width/(GLfloat)height, 0.1f, 100.0f);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
glTranslatef(0.0f, 0.0f, -5.0f);
glBegin(GL_QUADS);
// front face
glColor3f(1.0f, 0.0f, 0.0f); // red
glVertex3f(-1.0f, -1.0f, 1.0f);
glVertex3f( 1.0f, -1.0f, 1.0f);
glVertex3f( 1.0f, 1.0f, 1.0f);
glVertex3f(-1.0f, 1.0f, 1.0f);
// back face
glColor3f(0.0f, 1.0f, 0.0f); // green
glVertex3f(-1.0f, -1.0f, -1.0f);
glVertex3f(-1.0f, 1.0f, -1.0f);
glVertex3f( 1.0f, 1.0f, -1.0f);
glVertex3f( 1.0f, -1.0f, -1.0f);
// top face
glColor3f(0.0f, 0.0f, 1.0f); // blue
glVertex3f(-1.0f, 1.0f, -1.0f);
glVertex3f(-1.0f, 1.0f, 1.0f);
glVertex3f( 1.0f, 1.0f, 1.0f);
glVertex3f( 1.0f, 1.0f, -1.0f);
// bottom face
glColor3f(1.0f, 1.0f, 0.0f); // yellow
glVertex3f(-1.0f, -1.0f, -1.0f);
glVertex3f( 1.0f, -1.0f, -1.0f);
glVertex3f( 1.0f, -1.0f, 1.0f);
glVertex3f(-1.0f, -1.0f, 1.0f);
// right face
glColor3f(1.0f, 0.0f, 1.0f); // magenta
glVertex3f( 1.0f, -1.0f, -1.0f);
glVertex3f( 1.0f, 1.0f, -1.0f);
glVertex3f( 1.0f, 1.0f, 1.0f);
glVertex3f( 1.0f, -1.0f, 1.0f);
// left face
glColor3f(0.0f, 1.0f, 1.0f); // cyan
glVertex3f(-1.0f, -1.0f, -1.0f);
glVertex3f(-1.0f, -1.0f, 1.0f);
glVertex3f(-1.0f, 1.0f, 1.0f);
glVertex3f(-1.0f, 1.0f, -1.0f);
glEnd();
```
在这个示例中,我们使用了透视投影矩阵来实现透视效果。在`gluPerspective`函数中,我们设置了视角为45度,视口的宽高比为窗口的宽高比,近裁剪面为0.1,远裁剪面为100.0。通过调整这些参数,我们可以改变透视效果的强度和范围。
我们还使用了`glTranslatef`函数将立方体移动到屏幕中心,并使用`glBegin`和`glEnd`函数绘制立方体的各个面。每个面都用四个顶点来定义,每个顶点都用`glVertex3f`函数来定义。在每个面之前,我们使用`glColor3f`函数来设置面的颜色。
这个示例只是一个简单的例子,可以根据需要进行修改和扩展。